Top critical review
Be careful. Writing speeds drop to USB 2.0 speeds after about 20 seconds, 1 file. Very Poor. 1 Star.
Reviewed in the United Kingdom on 3 September 2020
THIS IS AN ACCURATE AND HONEST REVIEW: This arrived just yesterday. I formatted it to NTFS and then today I used it. I had one file to place on the drive, a 13.4Gb video file. I am a Computer Technician and have been using flash drives since their inception. I am able to transfer files from my mechanical hard drives on my computer (Raid 0) at roughly 230 Mb/s onto another hard drive. I also have a Samsung USB 3.1 128GB flash drive I bought from Amazon a few months back, that I also formatted into NTFS when I first used it. I have bought 3 Sandisk drives over roughly 3 years and they ALL have the same problem. They start taking data from my PC drives FAST and then after 10-20 seconds the transfer speeds always drops to USB 2.0 speeds or worse. It took 15.6 mins to transfer that video file to this Sandisk USB 3.1 256GB flash drive. I knew right away I had made a mistake buying this, but just to be certain, right after I had transferred the video file, I immediately took the drive out of my USB 3.0 port and then placed the Samsung USB 3.1 128GB drive in its place and copied the same file to the Samsung drive, and it was accepting the file at 60 Mb/s and took roughly 4 mins to transfer. One of the Sandisk drives I had bought previously had malfunctioned, but had lost the receipt for it and is dead. The other one I had sold to a friend. I thought that this USB 3.1 Sandisk 256 flash drive would be different and better. Sadly that is not the case. These drives are awful and I will NEVER buy another Sandisk USB drive again. If you want a good USB flash drive, go for a Samsung USB 3.1 flash drive drive, constant 60 Mb/s. The heat build up is roughly the same as the Samsung drive and the quality is also good but sadly, the internals are VERY awful. Sandisk, as a company need to take this review seriously and solve the problem. It is NOT recommended you buy this drive, because of its poor performance. Like I have already stated, the last 3 Sandisk USB drives have behaved in the exact same way, REALLY AWFUL. A lot of the time when transferring the data, the speeds will drop as low as 7.0 Mb/s and a little less and then go up a tiny amount and then drop to 7.0 Mb/s again.