SanDisk 4TB Extreme PRO Portable SSD – Up to 2000MB/s – USB-C, USB 3.2 Gen 2×2, IP65 Water and Dust Resistance, Updated Firmware – External Solid State Drive – SDSSDE81-4T00-G25

Great for backups
I use this for backups on my MAC / great little item, fast, no problems, easy to setup and use. While this is a 2TB, I do have a 1TB I use for other items. Durable, lightweight, great quality. Would buy again when needed.

Specs are probably true (read below)
OK, so I read many of the reviews of this drive, and I believe that people who are saying this doesn’t give them the speeds that it’s rated at, may not be testing it correctly. There are MANY factors that go into properly testing the speed of an HD … OS file buffering/caching being a HUGE one. The drive that I bought, SDSSDE81-1T00-G25 – SanDisk 1TB Extreme PRO Portable SSD – Up to 2000MB/s, boasts speeds up to 2000MB/s (read/write). If you plug this drive into your computer and you use the blue USB 3.0 cable, you will not get the maximum speed out of this device because the max speed for USB 3.0 is 625MB/s. If your computer happens to truly have a USB 3.2 Gen 2×2 port, and you have a cable that supports that, then you could theoretically get the max speed out of this drive. Next, if your computer has a USB-C port, is it truly a USB 3.1 or better (or a Thunderbolt) port, or just a USB-C 3.0 port. Finally you have all of the OS file buffering stuff to deal with. Once you plug this drive in, you’ll need to make sure you’ve set your OS’s file buffering/caching to it’s highest performance settings. Even with that, testing may not reveal the correct speeds because your OS may not buffer enough of the files being transferred to accurately test the read/write speeds of the drive. Another area for potential speed (and max file size) issues is the file system. You’ll most likely want to format (keep) this SanDisk external SSD with exFAT (what it comes formatted in) unless you’re going to use it 100% exclusively with your own computer (exFAT is readable/writeable in most OSes). If that’s the case, it might be faster performing in your OS’s native file system format, but that’s not a for sure thing. It’ll depend on the size and number of files that you’re planning on using it to read/write. Several large files compared to thousands of small files makes a difference in performance too (you may want to look into this further yourself if it is a concern to you).I have a WIndows PC. After doing the stuff I mentioned above, when I do a large file transfer to the drive, it starts out at 1.7GB/s and then begins to drop to a steady 915MB/s or so. This reflects close to the drive’s specs at the start, but Windows file buffering doesn’t cache enough of the file to get a continual accurate reading, hence the speed drop in write speed. In testing out the read speed, I was only able to get around 700MB/s, but that is because I am copying a file from a super fast HD (this Sandisk drive) to a much slower HD (my internal PC HD), so it can’t transfer any faster than this. I also tested reading and writing just from this Sandisk drive and got around the same 700MB/s, however, this is not a fair nor accurate test, because the same drive is doing the reading AND the writing. Finally, I ran the Blackmagic Disk Speed Test that everyone else seems to be using to test drive speeds, and got only 915MB/s read and write speeds. We know this is not accurate since I got 1.73GB/s in my own testing.So all of this to say that I believe this drive is probably fully capable of its advertised speeds, but you will likely not see speeds that fast due to OS limitations, other drive limitations, hardware limitations (your cable and/or port), etc. I’m happy with it because it averages about 1sec/GB throughput, and for files that Windows can buffer completely, I’m getting much closer to the spec’s speeds. Hopefully all of this info. is helpful. Just remember, you get the best possible speed out of this drive by connecting it to a true Thunderbolt 3 port on your computer and by setting your OS’s caching/buffering settings to maximize the performance (even a USB-C 3.1 or better port will get you the best speed out of this drive).

Haven’t had many chances to test the capabilities of the SSD, but, so far its performance is quite impressive. Turning on its encryption was also straightforward. I heard many news in the past if its data integrity issues but I hope SanDisk has fixed it and it wouldn’t happen down the road.

So small and convenient. I bought the Monterey color as well and it is similar transfer speed. Just Wow! For both of them. It’s super fast and the perfect size. I’m using it as an external drive, I truly like the size..wanted alot of space..just excellent for what I need to store. I would recommend. Thanks Seller Amazon!

Produto EXCELENTE, do tamanho de um maço cigarro e muito prático, UM MEGA PEN DRIVE.Funciona em Smart Phones e Pcs, ótimo para BACKUPs.