16GB USB Flash Drive Pen Drive Thumb Drive Memory Stick -10 Pack -Black

Review is for 10-Pack 16GB USB 2.0 variant.The good:All ten drives test OK.All ten drives have excellent read speeds, averaging 34.1 MB/s with little variation.The bad:Write speeds and access times are generally bad, but inconsistent.No matter how you count, 15,728,640,000 bytes is not 16 GB.Testing was done with gnome-disk-utility on a USB 2.0 port. All 10 devices identify as "TONPHA USB 2.0 Classic". As mentioned, read speeds were consistently excellent, but write speeds varied. Seven of the ten drives averaged 4.8 MB/s write, while the other three averaged 8.4 MB/s. Access times also varied and trended with write times: the slow drives averaged 5.18 ms, while the fast drives averaged 1.57 ms. Attached screenshots show representative results for each group. For reference, there is also a result for a USB 3.0 SanDisk 128 GB Ultra Flair (33.2 MB/s read, 20.8 MB/s write, 1.04 ms access).I bought these primarily to use as bootable drives (Debian, MemTest86, Clonezilla, etc.). I expect they will be perfect for this purpose. The slow writes will hurt a little, but the fast reads will make up for it. Longevity is a question mark, but at this price point, I don't care too much.Physical build quality is decent. Packaging and literature are surprisingly good. I like that they came with perfectly sized labels.

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Updating this review: The seller read the review below and has contacted me and made a quick and satisfactory adjustment to the amount I paid for the failed Devices. I was not expecting this type of response, so this appears to be a good seller to purchase from.I was disappointed in that only 8 out of the 10 pack were usable. No media is the error associated with the other two. I tried several methods to circumvent the error and nothing worked. There were just defective. I did not return them because I needed to use some right away. I just accept the loss as part of the price and I got 8 for the price of 10. If you are considering these, keep that in mind.

These seem like a good product. I’ve purchased some of these thumb drives before they contained ad ware and hidden files. Not the case here. Just bland and ready for use.

Got these to distribute a large folder of files to a number of people. Each drive loaded fine, copied fine and data tested fine. Not planning these for lots of active use, mostly remote file retention. I'd get them again if I needed a number of drives for a reasonable price.