VICFUN 100 Pack 16GB USB Flash Drives Bulk 16GB Flash Drive 100 Pack USB2.0-Blue

I bought a powered 10 port USB hub to go with this 10 pack of USB Flash Drives. I should have been able to use all of these drives at the same time, in parallel. Within a few minutes of connecting the drives, 3 had already failed with IO errors. I was writing data to one drive at a time, so it's not likely I was drawing too much power for the USB hub.I unplugged the 3 drives, and re-plugged them. As expected, the drives were fine. I tried running performance tests on the drives. Most of the drives had streaming IO of 2M/s. Some were about 65k/s. A couple had only 16k/s. But while simply trying to write to the drives, several went off line again.UPDATE: (12-11-2019) I suspect that these drives are incorrectly marked as 32GB and are really only 4GB drives. The drive info seen by Windows and Linux says 32GB, but when I try to write more than 4GB to them, they get IO errors and fail. I was able to verify that all 10 of my drives failed, and I decided to return them for a refund.

The speed was pathetic! Moving 15GB of apps to this drive took almost 2 hours. Totally useless. I tested CrystalDisk Mark 6_0_2 on 5 of the 10 and I got the idea. I cannot spend that much time out of my day. I would get nothing done all day. I have submitted a return and have a return label and it will go out tomorrow morning.

Glacially slow, disappears, works terribly. I tried reformatting, still worked terribly. I'm afraidit will ruin my computer. I am tossing them out and going to a standard store and gettingcheepos there, even if I have to pay more.It's actually worth "0."Go elsewhere.

I purchased the item with 20 of the 32GB drives in it. Out of those 4 had failures when trying to place a 24 GB ISO boot image (corporate Window 10 install) on them. That is a 20% failure rate. I will not be purchasing any drives from Vicfun again due to this issue.Update 10/11/2019 - I just had another key fail to image. So that makes this a 25% failure rate on these devices.

These are great little thumb drives at a great price. I purchased the 8 GB units. The end caps can be totally removed. I worry the caps can be lost but then they provide 100% dust prevention. I got the red drives but will get the other colors possibly. The opposite end of the drives furthest from the USB connector has a loop tether. Also, that end contains a red LED that blinks when data is being transferred...remains constant when no data is transferred. I liked these so much I purchased a second set. The drives come enclosed in a nice cardboard box with a sectional divider. The case is metal (I checked it with a magnet). A bit of an update (090119): I was having a problem with intermittent recognition (mounting) of the drive using Windows 7. I use my laptop's front USB connector a lot for USB Drives. I then used a 6 inch extension USB cable and haven't had one problem since (40 for 40 burns). I do sometimes have a slow burn but that time I was also on the Internet. Looking forward to buying more of these drives. Hope this helps. Update (091819)...purchased another 30 units. Love these little drives.Update: October 30, 2019 Still love these great little USB Drives. I think I've purchased about 100 of these units in the past 12 months. I like the red-cased Drives. The internal LED is red and looks nice. I haven't purchased any other color...don't know if the case color is the same as the LED color. One new unit I received had a dead short. I took it apart by removing the clear cap...it is held in with a spot of silicone. I didn't discover any solder bridges but solder-wicked and removed the USB connector. Then I re-installed the USB connector. Short went away and the unit communicated okay. I power-up units for 24 hours now just as a test.

I knew that when I was purchasing these there was likely to be a few that had some issues. First one I used worked as intended. Second one failed upon data transfer almost immediately. I haven't used any more since then so I can't speak on how many work overall. We mainly bought these for temporary file storage, mostly for file transfer. Put movies or music on them to take to our tv to watch, so our expectations weren't super high. I would not trust these to store vital data that you do not have a backup of.Edit. After having a chance where we needed to use more of these I wanted to update my review. I would definitely not purchase these again. I believe we may have been able to use these a hand full of times before they all stopped working. If I even thought about formatting the one I was using two others in the package already gave up on life. I never had high expectations but these were a waste.

I don't know how these got such great reviews. All of the ones I received were junk. Half of them had no accessible storage and were not even capable of being formatted. The other half were extremely slow, and sometimes would just stop mid transfer. Don't waste your money.

First one froze and would not finish copying a 3 GB video file. Restarted pc and USB is not recognized.Tried another one, a 3.7 GB video file started out at 22 MB/s and it slooooooly came to a halt. As you can see from the picture, it's been at 5 seconds for half hour. Not worth my time to save a few cents. Buy a brand name USB and be done.Maybe they're good for photos or small files, that's about it. Then again, why would you trust your contents to this less than mediocre product?DON'T WASTE YOUR TIME ON THIS JUNK. I CANNOT GET MY 2 HOURS BACK.