Sandisk Extreme CZ80 64GB USB 3.0 Flash Drive

Not having a good luck this one as expected.First the total capacity i found for this drive is 58.4 GBThe correct capacity of 64 GB USB 3.0 pen drive is 59. 3 GBI also contacted SanDisk C.C but response is very poor. Nothing solves yet.I think there is some difference with this USB drive between the newest versions& older versions (which is costlier) & could be better.Its write speed is below is its huge claim that never match.The Write speed of 2.70 GB & above is between 20 - 23/4 MB/s on my USB 3.0 port.Transfer speed is not regular sometimes speeds up & down quickly.Maximum read speed is all less than 100 Mb/sWrite speed not come above 30 Mb/s in my system.Worst part of this purchase is buying with Axis Bank's EMI.Axis Bank not charged the bill of my credit card same as EMI option given here which I selected.Axis bank taking full payment against their EMI plan & how can it called an EMI? If it charging opposite then what is the meaning of giving EMI option here???I did not borrow money instead I choose EMI but it’s wrong. Very stupid greedy bank. Don not fall into their traps.Only 2 Star.

Amazon delivered one day ahead of time.Transfer speed in macbook air is more than 100 mbps. In windows systems its slower. 40 gb stuff transferred from windows 7 to extreme in 30 minutes. not sure if the port was 2.0 or 3.0 though. great as storage option, which is what i'm using it as now.

Works as advertised. R/W Speeds are at par with advertisement. The USB 3.1 version (SanDisk Extreme Go 64GB USB 3.1 Flash Drive) is slower than this drive. Grab it while you still can.  SanDisk Extreme CZ80 64GB USB 3.0 Flash Drive

I got a 64 GB from US in 2013, and I think this is one the best electronic purchases I've made in my life.I've another one for a friend of mine!!!!

Have been using it for last one month. Excellent.

Nice product. Does what has been said about it.

Good product...

Very good transfer period

Wow! That's a wicked fast flash drive! A review of the SanDisk Extreme 64GB USB 3.0 Flash Drive with Speed up to 245MB/s-SDCZ80-064G-GAM46I ordered SanDisk Extreme 64GB USB 3.0 Flash Drive based recommendations and reviews I saw in various places on the web. The typical comment was that this particular series of flash drives are so fast that it is like having a solid state drive (SSD) in the form of a USB stick and reasonably priced. In laymen's terms, it's a seriously fast drive and well-priced, especially when considering its level of performance. I'd been wanting a high capacity USB 3.0 flash drive for a very long time to transfer data between several machines and/or use as an emergency boot drive for my Macs but always held off due to cost. The price of the flash drive always seemed too high in comparison to purchasing a low capacity SSD and installing it in a bus-powered enclosure. Recently, Amazon.com had a sale on SanDisk memory products. This became an opportunity to not only get the SanDisk Extreme USB 3.0 flash drive that was so highly praised at a reasonable price but also to get a 64 GB drive instead of a 32GB model.Review summary:The SanDisk Extreme 64GB USB 3.0 Flash Drive with Speed up to 245MB/s-SDCZ80-064G-GAM46 is incredibly fast! I'm neither a computer expert and nor do I have benchmarking software to measure the actual speed of the drive in megabytes per millisecond but can say without a doubt copying gigs of files to and from it takes a few seconds to a few minutes under USB 3.0, depending on the quantity and type of data involved. TheSanDisk Extreme is fast even under USB 2.0. It truly feels like an SSD on a stick! One key difference between this model and other USB flash drives (all USB 2.0 models and many USB 3.0 models) is that it's fast enough for me to use as a boot drive for my Macs. That was one of my goals and the SanDisk Extreme achieved and exceeded my expectations in this regard.My only concerns are the drive feels lightweight and has a slider mechanism for its USB interface and may have compatibility issues with an Inateck USB 3.0 PCIe card. That means the drive will require a touch of TLC when using it. However, these are minor issues in my opinion and the sheer performance of the drive vastly outweighs them. They aren't even enough of a concern for me to subtract a star from the review. The flash drive is that awesome! I plan to buy a slew of these drives to give as gifts to friends and family, even if their machines only have USB 2.0. They'll still benefit from the performance of this particular drive. It's much faster than other USB 3.0 flash drives and it'll blow away any flash drive that has just USB 2.0. That and the USB 3.0 interface and sheer performance future proofs the drive for use with new (or newer) machines that have USB 3.0 built into them.Full review:The SanDisk Extreme 64GB USB 3.0 Flash Drive ships in blister pack, which should come as no surprise. Flash drives are very small and it's common to see them for sale in blister packs or in bulk packaging. It's easy enough to open blister packs but I still find them annoying. What happens if you must return an item you've removed from one? It makes me feel a little funny on those rare occasions Ive had to try and close a blister pack and return the goods. Still, it's a flash drive and I didn't expect any issues.In my experience, the typical USB flash drive is about 1.5" to 2" long, .5" wide and a bit thicker than a pencil. Some are much smaller, though. I have a Patriot Axle 32Gb drive that is about an 1" long, .5" wide and a bit thicker than a pencil. The San Disk Extreme is about the same width and thickness as the Patriot Axle but more than twice as long. Think average in size. Not too big, not too small, and easy to hold. The Sandisk Extreme is lightweight and made entirely of what feels like a lighter weight plastic except for its USB interface. As a result, the SanDisk Extreme gives the impression that it will crack when dropped one time too many. However, I wouldn't worry too much about durability. I've owned a slew of USB flash drives and I've yet to have any of them break due to dropping and/or similar accidents. I can't say the same about slider mechanisms. I've had the slide mechanism break on a number of drives due to general wear and tear and/or poor build quality.The SanDisk Extreme has a loop on one end for use with a lanyard or keyring and a blue LED that lights up when it's in use. Kudos to SanDisk for making the loop large enough to make hooking a lanyard or keychain to it super easy but not so large that it appears out of place on the drive. The size is just right. The Patriot Axle, in contrast, has holes for a lanyard but they are tiny, making connecting it extremely difficult. You couldn't attach a keyring to it at all. The Sandisk Extreme is the first flash drive I've owned that has an LED and it's a welcome feature. The LED makes it feel less like a flash drive and more like a bus-powered portable hard disk drive. The LED also makes the drive more visible so you're less inclined to leave it connected to the computer accidentally. I've done that with other drives on all too many occasions.Flash drives are small devices and the capacity and other useful info is sometimes difficult to read and/or not even listed on them. The Patriot Axle is a good example. The name Patriot is easy to read, its capacity is in smaller text but still easy enough to read but it doesn't say if the drive is USB 1.1, 2.0 or 3.0. A Micro Center generic USB flash drive has just the words Micro Center on it. No capacity info, nothing. I know its capacity only because I slapped a label on it. I don't know if it's USB 1.1 or 2.0. The info on the SanDisk Extreme is large and easy to read. There is no mistaking the make, model, capacity and type of USB. This saves me the trouble of having to label it accordingly.SanDisk uses a slide mechanism to move the USB male end out of the case. Push the slide down slightly and move it with your thumb and the USB end pops out and locks in place. Push the slide down and move it in the opposite direction with your thumb and the USB end slips back into the case. Easy. And, no worries. The slide locks in place, something I didn't notice the first time I used the drive. So, if the USB end is out and ready for use, pushing it into the USB port on your computer won't make it slip back into the case. At least as long as you don't push down on the side while connect it. That's an improvement over the slide mechanisms of other flash drives I've used over the years.I can't say I'm a big fan of slide mechanisms. In my experience, they tend to be on the fragile side. I've tossed a couple of flash drives because the slide mechanism broke after a while. On the other hand, they do have their place. The design allows the USB end to be tucked into the case of the drive when you're not using it. A slide system also means there is no concern about loosing the cap that covers the USB end. For what it's worth, I've dealt with lost end caps far more often than broken slide mechanisms. So, I don't think it's a major concern.All that said, the reason I purchased this drive was performance. Up until now, I've only used flash drives with USB 1.1 and USB 2.0. And, they're slow. USB 1.1 flash drives were dreadfully slow. USB 2.0 flash drives are a huge improvement over USB 1.1 models but they're still awfully slow. The SanDisk Extreme with USB 3.0, on the other hand, is lightning fast! Far faster than I expected, despite the reviews I read about the drive.To test the speed of the SanDisk Extreme, I used the drive with my office's Mac Pro 2.8 GHz Quad Core Intel Xeon (Early 2008) with an internal solid state drive as its boot drive, internal hard disk drives as data, clone and backup drives, 6 gigs of RAM, built-in USB 2.0 and an Inateck USB 3.0 PCI-E card and my Early 2013 Macbook Pro 2.8 GHz Quad Core i7 with an internal SSD, 16 gigs of RAM and built-in USB 3.0. Here are the results of some of my tests.On my Office's Mac Pro:I copied 10.41 GB of movies from one of the tower's internal Western Digital Caviar Black 7200 rpm hard disk drives to the SanDisk Extreme USB 3.0 flash drive which was connected to the computer's Inateck USB 3.0 card in 2 minutes 12 seconds. Fast! Very very fast!The same data copied from the Western Digital Caviar Black hard disk drive to the SanDisk Extreme USB 3.0 flash drive plugged into one of the Mac Pro's built-in USB 2.0 ports took 5 minutes 8 seconds.That was from an internal data drive. The Mac Pro's primary boot drive is an SSD.Copying the same data from the SanDisk Extreme plugged into the Inateck USB 3.0 card to the internal SSD of the tower took 2 minutes and 18 secondsCopying the data from the SSD back to the flash drive 1 minute 9 seconds.That's on the Mac Pro. Keep in mind, this is a modestly upgraded computer that is nearly 7 years old.However, and it's an important however, is the drive had some issues when connected to the Inateck USB 3.0 PCI-E card. On the Mac Pro, it took a couple of tries to perform the copy tests when the Sandisk Extreme was connected to the Inateck USB 3.0 PCI-E card. The flash drive unmounted during the copies on a couple of occasions. I suspect the source of the problem is the Inateck USB 3.0 PCI-E card since this behavior only appears when the SanDisk Extreme is connected to it. The SanDisk had no trouble whatsoever when connected directly to the Mac Pro's USB 2.0 ports.I'm not sure if it is an incompatibility between the SanDiesk Extreme and the card or the design of the card itself. Unlike some USB 3.0 cards, the Inateck card doesn't connect to a separate power source in the computer and isn't designed for use with bus-powered devices. Admittedly, the power requirements of a flash drive should be minimal but I can't dismiss lack of juice as a contributing factor. Further tests with the drive connected to the Inateck card are a must. For now, I will not use the SanDisk drive with it.However, and most importantly, the drive functioned perfectly when connected to the built-in USB port of the tower, albeit slowly since it's USB 2.0 and it performed perfectly when connected to the built-in port of my Macbook Pro and performed perfectly when connected to the MPow powered USB 3.0 hub. And, speaking of using the Sandisk Extreme with my Macbook Pro, the results of the tests reflected even faster copies!Here are the results using the same data used on the Mac Pro:Copying the data from the Sandisk Extreme to the internal SSD of my Macbook Pro took 41 seconds.Copying the data from Macbook Pro's internal SSD to the SanDisk Extreme took 1 minute 7 seconds.My Macbook Pro has only two USB 3.0 ports. I needed more USB ports and shortly after buying the Inateck card for the Mac Pro, I purchased an Mpow 7 Port Premium Aluminum Powered USB 3.0 hub. The Mac Pro is now at my office but I kept the Mpow USB 3.0 hub. I keep it connected to one of the USB 3.0 ports on my Macbook Pro and it is the primary means by which I connect USB devices to the computer. So, it was important to see how the Sandisk Extreme performed when connected to the Mpow USB 3.0 hub.Copying the same data I used for the tests on the Mac Pro from the Sandisk which was plugged into the Mpow USB hub which was connected to the Macbook Pro took 44 seconds.Copying the data from the Macbook Pro back to the SanDisk Extreme connected to the USB 3.0 hub took 1 minute 10 seconds.Wicked fast for a flash drive!I'm not sure why the time of the copy increased when the drive was connected to the MPow USB 3.0 hub but I'm not concerned. The difference is insignificant in my opinion. The SanDisk Extreme is so fast that you're not going to care. It's a flash drive after all, not a boot drive or data drive whose performance is critical for day to day work. For the record, the Mpow USB 3.0 hub has performed admirably since the day I bought it and it's definitely a highly recommended solid piece of hardware. If you need a USB 3.0 hub, definitely consider spending the extra bucks for it or its Anker twin.One of the reasons I chose the 64GB model of the SanDisk Extreme was because I planned to turn it into an emergency boot drive for several of Macs. The extra capacity will allow me to partition it so each machine can have its own boot drive. My previous attempt to do this with a Patriot Axle 32GB USB 2.0 flash drive for two machines proved unsuccessful. I was able to make the boot disks but performance was dreadful. Spinning beachballs and delays made booting a Mac off the drive unworkable. I was hoping this wouldn't be the case with the SanDisk Extreme flash drive. And, it worked! In fact, booting from and working off the SanDisk Extreme felt like I was booting off an SSD connected via USB 3.0. To say I was pleased is an understatement!I only recently purchased the Early 2013 Macbook Pro. I also own a 2009 Macbook Pro with a 2.26 GHz Core 2 Duo, 8 gigs of RAM and an SSD. I bought it new in '09 as a secondary machine to use on the road and when bcking up and/or repairing my Mac Pro (which I still owned at the time) or my office's iMac (which has since been replaced with the Mac Pro). It's a slow machine by current standards and only has Firewire and USB 2.0 for external drive connections. Since using the SanDisk Extreme as a boot drive for my Early 2013 Macbook Pro under USB 3.0 was such a success, I decided to see what would happen if I tried to boot the '09 Macbook Pro with it. Sometimes you have to do something just for giggles. I wasn't holding my breath since it's the oldest, slowest machine I own and only has USB 2.0.It was successful! In fact, booting off the '09 Macbook Pro off the SanDisk Extreme was faster than booting it off an external USB 2.0 hard disk drive. No beachballs. No slowdowns. The machine still felt snappy! I actually typed a portion of this review on the old machine while it was running off the SanDisk Extreme. This was totally unexpected and made for a wonderful surprise.This is not to say that anyone should use a USB flash drive as a regular boot drive. They're not designed for this purpose, so my guess is that it's probably not a good idea. However, as an emergency boot drive with a basic installation of the OS and a couple of drive utilities and/or even a backup copy of some critical data, I'm willing to give it a shot even if it is not the intended use for a flash drive. An emergency is an emergency and if the stick as a boot drive can get the job done, even as a last resort, then why not?Final assessment:Buy this USB flash drive! Buy several of them! The SanDisk Extreme 64GB USB 3.0 Flash Drive is incredibly fast! I don't have the software to measure the actual speeds but copying gigs of files to and from it takes a few seconds to a few minutes, depending on the quantity of data and machine involved. One key difference between this model and other USB flash drives is that it's fast enough for me to use as a boot drive for my Macs. That was one of my goals and its performance exceeded my expectations. My only concerns are the drive feels lightweight and has a slider mechanism and appears to have problems with an Inateck USB 3.0 card in my office's Mac Pro. That means the drive will require a touch of TLC when using it and further tests with the Inateck card are necessary. However, the sheer performance of the drive vastly outweighs these issues. I plan to buy a slew of these drives to give as gifts to friends and family, even if their machines only have USB 2.0. They'll still benefit from the performance of this particular drive. It's much faster than other USB 3.0 flash drives and it'll blow away any flash drive that has just USB 2.0. A very worthwhile purchase!-------------UPDATE-------------October 15, 2014I confirmed there is a compatibility issue between the Inateck USB 3.0 card I have installed in my office's Mac Pro (formerly my personal machine) and SanDisk Extreme 64GB USB 3.0 thumb drives. I have two of the SanDisk sticks now. Identical models. Both formatted as MacOS Extended (Journaled). Both unmounted during copies when the drive was connected directly to the Inateck USB 3.0 card. No problems at all when the drives are connected to one of the Mac Pro's stock USB 2.0 ports.To take it a step further, I took a MPow Aluminum Premium USB 3.0 Hub which I use at home with my 2013 Macbook Pro and brought it to my office. I connected the MPow hub to the Inateck card and plugged the SanDisk drives into it. No problems at all when the SanDisk Extreme sticks are connected to the MPow hub rather than directly to the Inateck card itself.The sticks have no problems at all when connected directly to my '13 Macbook Pro, several '12 Macbook Airs, a recent iMac, a mid '09 Macbook Pro and a late '08 Macbook and a '08 Mac Mini. And, no problems when connected to the MPow while the hub was connected my 2013 Macbook Pro.So, under the circumstances, I think it's reasonable to say there is an issue between the SanDisk Extreme USB 3.0 sticks and the Inateck USB 3.0 card. What the actual problem is I can't say with certainty but my instincts say it's a power issue. The Inateck card doesn't have a direct connect to the power supply of the Mac Pro. Rather, it gets juice directly from the PCI-E connection.The SanDisk USB stick is the only bus-powered device I've used with the card. Every other device I've used with a direct connection to the card had its own source of power, i.e. several hard disk drives. No problems at all with any of the devices that have their own power source. So, I think the Inatack card just doesn't have the juice to handle one or more bus-powered devices, even something with low-power requirements like a USB stick.Robert

So, here's my review of the 'same' drive from two different sellers. One of them shipped the counterfeit drive that's been seen a few times in reviews, and the other one is a legitimate drive. Starting off, the packaging is obviously different: (See first picture)Different speeds, and of course the real one (On the left) doesn’t have typos. The fake advertises ‘free online storage’, but there’s nothing related to it on either side of the package and of course the drive itself doesn’t have any data on it. The real one advertises SanDisk SecureAccess. It also has 'SanDisk Extreme USB 3.0 Flash Drive" written in golden letters, but it didn't show up in the picture. Now, on the top the way it’s closed is also very different: The real one actually requires you to rip or cut the top of the package to open it, and is glued along all edges. The fake isn’t secured very well at all as you can see in the second picture.Now when we open it up, we see that the fake is actually secured only by two dabs of glue: one on each corner of the plastic. The only reason the cardboard stays together is because the glue flows around the plastic as can be seen in the third picture. The bottom is secured because it’s actually just folded over. (See serration lines where it was folded) The real one, on the other hand, is glued all the way along the edges, with a very even line. There is also printing on the inside, which is the code for the SecureAccess software. The plastic also holds it in slightly better, forming a bit of a clip near the middle, as can be seen in the fourth picture.Now taking the two drives out of the packaging, we can see that the real one has a bit more information on the back: There is glare, but there’s nothing really getting covered up by it. The fake also has much blurrier printing than the real one does, which can be seen in the fifth picture.Now if we look at the top, we can see that the fake (on the left this time) isn’t sealed totally: You can actually see the circuit board inside of it. Although you can’t pick it out from glare, the fake also has the SanDisk logo printed in a darker red. See the sixth picture.The mechanical switches are also very different, the real one having a nice smooth switch that clicks the actual connector out and locks it in place, which is also smooth on the way back in. There is a noticeable ‘click’ sound. In addition, when the real one is fully extended you can’t push it back in from the connector: This makes it very easy to plug in, while the fake simply uses a rough slider, it’s not nearly as smooth to move and doesn’t click unless it gets caught up on the internals which sometimes makes it very difficult to extend the drive out. It also doesn’t push out quite as far as the real one, which can make it difficult to connect if the port is depressed at all. Of course, there’s no locking mechanism, so if you don’t push the slider with the drive it will get pushed back inside. Now let’s plug them in. I’m going to use Hard Disk Sentinel for disk information because it will also show drives without smart information.I bring this up because the real drive actually shows up as an SSD controller: With smart information, power on time, etc. Specifically, the Model ID shows up as SanDisk pSSD, with a serial number field. It also supports Self-tests (Both Short and Extended). Total size reports as 59835 MB (58.4 GB)The fake however doesn’t have smart information: It also shows up as “IS917 innostor” for the model ID, no serial number. Note that’s not a typo, there are 3 spaces. It of course does not support any sort of self-test. Interestingly, the total reported size is actually slightly larger than the real drive, at 60494 MB (59.1GB).Now, I’m going to format both of these drives with NTFS at a 4096 allocation unit size. I’m not using a quick format for either drive to make sure that each sector is set to 0. The real drive formats noticeably faster than the fake does, even with both devices plugged into USB 2.0 ports (Not 3.0). The benchmarks will be both using USB 3.0 ports, and will be done one at a time (as I only have one free port).Now, plugging the real drive into USB 3.0, I’m going to run Crystal Disk Mark 5.0.2 x64 with 32GiB size, 5 times, with a 5 second interval and benchmark the drive.Sequential R/W (Q= 32,T= 1) Read: 217.321 MB/s Write: 193.902 MB/sRandom R/W 4KiB (Q= 32,T= 1) Read: 8.679 MB/s [2118.9 IOPS] Write: 11.415 MB/s [2786.9 IOPS]Sequential R/W (T= 1) Read: 264.867 MB/s Write: 186.432 MB/sRandom R/W 4KiB (Q= 1,T= 1) Read: 8.176 MB/s [1996.1 IOPS] Write: 11.415 MB/s [2786.9 IOPS]Notice that the benchmark actually exceeds the printed specifications in two cases. (Read up to 245 MB/s, write up to 190 MB/s) Now let’s try the fake, same setup.Sequential R/W (Q= 32,T= 1) Read: 45.221 MB/s Write: 43.279 MB/sRandom R/W 4KiB (Q= 32,T= 1) Read: 2.921 MB/s [713.1 IOPS] Write: 0.018 MB/s [4.4 IOPS]Sequential R/W (T= 1) Read: 44.881 MB/s Write: 26.843 MB/sRandom R/W 4KiB (Q= 1,T= 1) Read: 2.804 MB/s [684.6 IOPS] Write: 0.016 MB/s [3.9 IOPS]As you can see, it’s far FAR slower than the real drive, particularly with the random access. It's even managed to be slower than the printed specifications on the fake's packaging. Anyways, that’s it for comparisons.Finally, I STRONGLY recommend avoiding any seller shipping from hong kong or china. Get it locally, and if possible get it when fulfilled from amazon. The seller that I got the fake from had been in business for nearly a year and has had no negative reviews (Until today, obviously). Also note that if, in the event that you get a fake, DO NOT DESPAIR. You can do a A-to-Z Guarantee claim for these drives, and get your money back. You don’t even need to send the drive back, as usually they won’t respond. Just ask a chat representative and talk about the drive. You can even refer to this review if you wish. They will contact the seller on your behalf, and if they don’t respond after 2 business days they will file the claim and after they do some research you will get your money back. It’s one of the great things about amazon, and why I don’t worry much while purchasing through them. And with this I end my (Extremely long and detailed) review. Make sure to leave a negative feedback review on sellers who ship fraudulent products, don't just ignore it. I know if I noticed a 1 star review saying they shipped a fake I would have went somewhere else, and I would have had an actual drive that much faster.Of course, as can be seen from the benchmarks from the real drive, it's totally awesome. I actually use it for a repair disk for laptops and computers, because I can run a full copy of windows 10 on it using rufus. Note you can actually make it support secure boot as well if you do some hacking around with partition tables as well, even though it's not supported with Windows To Go. If you wish to do so, just do the following:1. Install windows to go with Rufus.2. Copy the following files and folders to another drive: "Boot" "EFI" "bootmgr" "BOOTNXT".3. Next you have to use partitioning software that supports doing partitions on USB devices (I used PartitionGuru). You have to shrink the NTFS partition a bit, then delete the fat16 partition that rufus installs at the end, and make a new fat32 partition (I used 40MB, it was a tight fit though). It should automatically format.4. Now, you need to back up the partition table. Note you only need to back up the table, not the partition itself. Once that's done, delete the NTFS partition. If the software is doing it correctly, it should not delete the actual data. Windows should now automatically show the 40mb partition we made earlier. If not, assign a drive letter. Make sure to hit save!5. Copy those files from earlier to the new fat32 partition. It should BARELY fit: I had 2 megabytes free.6. Now restore the partition table backup you made earlier. If it asks you to restore the boot sector say yes. Now your drive should have a large NTFS partition with windows on it for the first partition, and a tiny fat32 partition with a copy of the bootloader on the second. Only the NTFS partition should be shown in windows explorer.Congrats! You are done. Now if you try and boot from the drive with a computer that doesn't natively support booting from NTFS, it should still properly boot from the signed microsoft bootloader on the fat32 partition, which will boot windows.

Whenever I see speed claims on SD cards or USB cards, I always take it with a grain of salt. The key word is always "up to" a certain speed. It doesn't necessarily mean it will run at that speed, but rather under a given certain circumstances you "may" get a speed anywhere up to the advertised speed. Know this, and reading some of the reviews already posted, I went into this with low expectations.That said, I was indeed right about the "up to" speeds but also pleasantly surprised by how close it was to the advertised specs. I purchased the 64gb drive. Out of 3 tests with an empty drive on CyrstalDiskMark 64 bit on a USB 3.0 motherboard slot, the best speed I got was:204.5 mb/s Read191.9 mb/s WriteThe read speeds fall short of the 245 mb/s read but the write speeds are right on the moneyI've benched SSDs on the same platform before and they have either been right at the mark of their rated specs or even superceded them, so I am quite confident that my hardware isn't the issue here. I'm sure with a different benching software suite or a different test the speeds might inch closer to the advertised 245Mb/s rate. But again, I'm within the "up to" speeds and it's reasonably good. I purchased this for $27 and to get 204 mb/s with 64gb, that's pretty good outcome. I tried copying over a few videos totaling 4.5gb and it took approximately 20 seconds averaging 150-160 mb/s rates. Again not too shabby and quick enough for my uses. Most USB 2.0 thumb drives will get you 30 to 45mb/s read and USB 3.0 drives will get you 90 mb/s if you get the high performers. 200 + mb/s is definitely good enough for my uses.I would ask SanDisk to be more humble with their speed ratings next time to ensure less customers are upset with their real world numbers. Rating this as a conservative 200 mb/s read drive would have been plenty quick enough and had less complaints too. A few lucky people got 245 mb/s or more on Amazon. To you, I say congrats on winning the binning lottery!My primary complaint with this drive is the build quality and construction. It feels cheap and light. When you have it in your hand, it feels like the cheap thin plastic that is prone to cracking after a few months of use. Stressing the drive a bit creates an annoying creaking sound verifying that the drive is poorly built. However I do like the sliding USB plug mechanism. It slides in and out with quick movement and makes a satisfying click. The plug also locks in place until you release it with the switch. Furthermore, I believe there is an excessive amount of superfluous space inside the drive. Tapping on the plastic verifies that much of it is indeed hollow. I understand there needs to be space in the rear as the entire PCB inside needs to slide in and out. However the drive would have done much better with cutting down that hollow mass and cutting down on the thickness. I would have preferred for a smaller, more rugged package with harder plastic to withstand drops and being stepped on.

I purchased this SanDisk Flash Drive to store movies for use with my new 2016 MacBook Pro Retina with a SSD.  SanDisk Extreme CZ80 64GB USB 3.0 Flash Drive - SDCZ80-064G-GAM46  This is a great little drive that has no trouble keeping up, it can read and write just as quickly as my SSD, so there is no lag time in transferring and downloading files. This drive is very fast, provided that you have a computer drive that can read and write as fast as, or faster, than the drive itself.✳️ I can download a 2 - 3GB 720 or 1080 movie file in under a minute. I currently have approximately 20 movies stored on the drive at capacity.I decided to purchase this drive after having read USB Flash Drive top 10 lists for 2017 by both PC Mag and MacWorld. Both articles rated it in the top two, out of ten, for speed within it's price-point. This drive has a lever you slide forward with you finger to access the drive. One of the articles, and several reviews I read before purchasing the drive made mention that the button sticks, and that they found it difficult to slide the button forward to expose the drive, however this has not been the case with the drive I purchased, I have encountered no issues whatsoever in this area, or with the drive in general at all.⭐️ ADDITIONAL SECURITY FEATURES & ENCRYPTION: ⭐️One cool feature of this drive is that you can partition it and use a portion of the drive for everyday non-secure files, while encrypting the remainder of the drive for storing information you would like to keep secure, that can then be easily accessed using a password. This eliminates the need to carry around two drives, one for secure and one for non-secure files, which I could see being handy when traveling for work, etc. This is not a feature that I, personally, have had occasion to use. So, I cannot speak to the ease of use of either the software or the function of drive itself in that regard.➕ IF YOU ARE GOING TO USE THE OPTIONAL SECURITY ENCRYPTION FEATURES OF THIS DISK WITH A MAC, YOU WILL FIRST NEED TO DOWNLOAD THE SOFTWARE ONLINE FROM THEIR SITE. THE SOFTWARE, AND ADDITIONAL STORAGE BACKUP ACCOUNT, ARE INCLUDED WITH THE PURCHASE OF THE DRIVE.🌐 OVERALL, I am really pleased with this drive. It is easy to use and once registered, comes with a full warranty. If you have any questions leave them in the comments and I will be happy to answer. SanDisk Extreme CZ80 64GB USB 3.0 Flash Drive - SDCZ80-064G-GAM46

Great flash drive. Really handy that the plug slides in and out, no cap to lose.Update: After using this flash drive for several months, I was frequently having trouble w the USB plug end springing backward about 1/8" whenever I plugged it in. I purchased this thumb drive to use it w our DVR recorder box for recording free TV shows. It works well for that purpose. However, if you don't get it fully plugged in, the scheduled shows won't be recorded, and that's frustrating. After this happened two days in a row (in spite of me having made my best effort to make sure the drive was fully plugged in), I decided it was time to report the drive as defective. But just before I contacted SanDisk I discovered what the problem was, and I'll describe it in case others have this same issue.There's a button on top of the thumb drive which allows you to retract or slide out the USB plug end. In the middle of the button is a raised place for your thumb tip to push against. Any slight pressure on the top of this button allows the USB plug end to spring backward when you are plugging it in. As long as you keep your thumb OFF the slideable button on top, the plug end will not spring backward. If I had been the engineer designing this drive I would not have been satisfied with this quirk being present, because it's very natural to keep your thumb on top of the drive as you plug it in. But as long as you are aware of this quirk, and don't put any pressure at all on the button when you're plugging it in, it works fine.