I changed the drive letter of an external 2.5' HDD (from F to D).
Then for some reason I suddenly can't use the drive anymore.
Now when I plug it, the error message is on Win7 is "You need to format the disk in drive"
The error on Win XP is D:\ is not accessible
which is quite weird.
The drive is not used much, it never had surface problems, etc.
Of course I don't want to format it because I have some info there.
Any ideas about what the problem could be...?