Yup, thoreldan has the answer. Format it with the file system
set to "FAT32". You can do it in either Windows ME or XP - it
doesn't matter. But just a note that you can't format a partition,
using FAT32, over 32 GB in Windows XP. More info about its
limitations here.
Link:
http://support.microsoft.com/kb/314463
You cannot format a volume larger than 32 gigabytes (GB) in size
using the FAT32 file system during the Windows XP installation
process. Windows XP can mount and support FAT32 volumes larger than
32 GB (subject to the other limits), but you cannot create a FAT32
volume larger than 32 GB by using the Format tool during Setup. If
you need to format a volume that is larger than 32 GB, use the NTFS
file system to format it. Another option is to start from a
Microsoft Windows 98 or Microsoft Windows Millennium Edition (Me)
Startup disk and use the Format tool included on the
disk.