|using ntfs on external hard drives will limit its usability to ntfs machines only (nt4, 2k, xp, 2k3 server and vista)|
to convert your disk to ntfs, open a command prompt and type:
convert drive_letter: /fs:ntfs
i.e. you external disk is using the drive letter 'e:' then type:
convert e: /fs:ntfs
p.s.: i never experienced any loss of data when converting drives to ntfs, however, backing up important files is mandatory.
Today's subliminal thought is: 'Calm down ... it's only ones and zeros.'