I have multiple FAT32 based flash drives (pendrive, CF). The only thing in common is that my PC reports them as "not formatted". I cannot format them in either FAT or FAT32 from this PC either, however NTFS works fine.
I have run CHKDSK from my PC agsint the card and it to be OK. CHKDSK t: /V lists the files and that the colume is FAT32. Disk manager repotrs the volume, but cannot read that it is FAT32. Neither Expplorer or "Command Prompt" can list the drive.
I can also assign the card to a VMWare on my machine (Ubuntu), so I beleive the problem is causedby XP's lack of skills in understanding FAT(32).
These cards works OK sing XP on other machines. I have reoformatted them on other machines and in my camera. This has not helped for this XP machine.
I am away on vacation and this is the only PC I have now + I need FAT32 for my camera, so NTFS is not an alternative.