Just received a new Kingston High Endurance 256GB card from a reputable shop, and figured I'd write ~33GB of data to it (set to 33000000000 bytes in UI) just as a quick sanity check without immediately filling it to the brim.
No issues while verifying the individual blocks, but I got a weird "First failing byte: -1" error at the end:
MediaTesterResults_2024-01-24_12-15-23_FAIL.txt
Tried again with 1GB (1000000000 bytes), same thing:
MediaTesterResults_2024-01-24_12-19-15_FAIL.txt
Tested a random 8GB Memory Stick Pro Duo I had laying around with both a fresh exFAT and FAT32 format, and it did the same thing both times. Was fine when I tested the full capacity, so I'm guessing this is a bug?
Also, bonus round: Setting 1000 bytes on the 256GB card led to some different weirdness, with the test going for about half a minute (way longer than expected) and the "Remaining" field going negative. Log:
MediaTesterResults_2024-01-24_12-20-03_FAIL.txt
(also got the same error in the end)
The 256GB card was tested with its factory exFAT formatting, and has now gone into service -- I can't run further tests on it if required, but let me know if I can provide any other info. Version was v0.4.1.0, Windows 10 x64 22H2.