I take it you've reinstalled windows and now trying to copy the data back?
should be formatted as fat32 or perhaps ntfs
if you can't see it in windows, just boot into slax to copy the files back
check it's at least XPSP2. Install SP3
Installed SP3. Slax no longer detects the drive after i've installed XP for some strange reason. However, the drive still works fine on my mac and was initially formatted in fat 32. Windows see's the drive as I get the found new hardware prompt, and I can see the 300gb space in disk management, just i can't assign it a drive letter/access it !
Thanks for your help pal.