[casacristo]

The rockwell videos all played fine...

I run h2testw:
The media is likely to be defective.
1.8 GByte OK (3801472 sectors)
13.9 GByte DATA LOST (29193856 sectors)
Details:13.8 GByte overwritten (28965779 sectors)
0 KByte slightly changed (< 8 bit/sector, 0 sectors)
111.3 MByte corrupted (228077 sectors)
63.5 KByte aliased memory (127 sectors)
First error at offset: 0x0000000074030000
Expected: 0x0000000074030000
Found: 0x0000000000000000
H2testw version 1.3
Writing speed: 14.2 MByte/s
Reading speed: 17.1 MByte/s
H2testw v1.4

Looks like it is only 2GB

What I noticed is that when I copy one of the files that give the file format error back from the mp4 player to my PC (Linux) the file is no longer playable, the size shows correct but it does not appear to be a multimedia file anymore.
So the problem is more complicated as now I can not be sure a file does not play because the player does not support the codec as perhaps it can but it is corrupted...

Is there some way to check the flash for 'bad sectors' to mark them as such and prevent file corruption?

What happens if the flash is really 2GB but is marked as 16GB, when you write bigger files, would it show out of space errors or would the files get written somehow but of course contain no real data