I have a thumb drive which is formatted to FAT32 but not recognized in Windows.

Using "testdisk" I can find the partition OK, but testdisk reports:

Disk /dev/sdc - 30 GB / 28 GiB - CHS 29327 64 32 Current partition structure: Partition Start End Size in sectors

Warning: number of heads/cylinder mismatches 255 (FAT) != 64 (HD) Warning: number of sectors per track mismatches 63 (FAT) != 32 (HD) 1 * FAT32 LBA 0 1 1 29327 63 32 60063712 [DATADISC]

If I select the partition and view files then i see what I expect to see, and I can manually copy off individual files from there. So from a data recovery perspective I have everything I need.

However, if I try writing the partition information back using testdisk the thumb drive is still not recognised in Windows and if I reopen it in testdisk it reports the same issues.

I tried changing geometry to 255/63 as testdisk suggested, but then analyse says "Bad relative sector".

What do I need to do so that the disk is recognised in Windows?

Mark