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Help Advice needed for bizarre microsd behavior

I have been having trouble writing files to my microsd card. SanDisk 32gb card from Amazon. Music files won't open. Video files won't play, though every file tool claims to copy them successfully.

When I ran an sd read/write test, I got a 300mb file successfully written and read at first, but repeat tests showed fails.

Gets really weird when I try to format the card. The phone file explorers like Solid Explorer, ES File Explorer fail. The Settings option to format the card unmounts the card, claims to be checking it, then nothing. A Windows laptop says it failed to format the card.

When I delete all of the files on the card using a file tool on the phone (be it Total Commander, ES, Solid Explorer, whatever), they claim to delete the files, but later on they all appear again.

Any advice? Is this a pirated card or just damaged? If I can't format it, what possible steps can I take? I've been able to read off of it to backup the files that are on there to an external hd. They appear to work when accessed on the laptop.

Thanks in advance!
 
Yeah definitely sounds fake.

A handy tool to keep by your side is H2testw.exe for Windows. This will tell you if there is a fault / faker present.

Download H2testw 1.4 Free - Check your USB for errors with this tool. - Softpedia

I think this H2testw tool confirmed it:

Warning: Only 20206 of 30424 MByte tested.
The media is likely to be defective.
0 KByte OK (0 sectors)
4.2 GByte DATA LOST (8897766 sectors)
Details:0 KByte overwritten (0 sectors)
0 KByte slightly changed (< 8 bit/sector, 0 sectors)
4.2 GByte corrupted (8897766 sectors)
0 KByte aliased memory (0 sectors)
First error at offset: 0x0000000000000008
Expected: 0x0000000000000011
Found: 0x0000000000000000
H2testw version 1.3
 
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