![]() Then it will pretty much stall and the write speed drops to 0 for some number of seconds then slowly rise. I copied about 128GB to it under Windows 10 圆4 with a USB 3.0 port. It passed a FakeFlashTest run, can be filled successfully, but the performance is very erratic. I bought a 128GB Lexar S57 USB 3.0 flash drive from Office Depot. Leaving the card idle, but powered for a few minutes seems to have allowed whatever error the controller encountered to clear enough to allow subsequent writes to continue at 150-200kB/sec for about 100 MB before jumping to ~500kB/sec (see attachment). It passed a FakeFlashTest run, but also fails when attempting to fill the card with files with the same Error 0x8007045D: The request could not be performed because of an I/O device error. I also bought a 128GB Samsung EVO+ card from B&H. I tried filling the card in multiple computers with several different readers and file sets, but it can't be done. Attempting to fill the card with files results in a Error 0x8007045D: The request could not be performed because of an I/O device error. The replacement passed a FakeFlashTest run, had some decent CDM results, but ultimately is bad too. I RMA'd it back to B&H, and got a replacement. Failed a FakeFlashTest run right out of the package. I bought a 200GB Lexar 633x micro SD card from B&H, it was bad. So did the quality of flash memory going into USB sticks and microSD cards go down the toilet or am I just having horrible luck?
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