Hi, Roy.
WinXP can mix and match FAT12, FAT16, FAT32 and NTFS, as well as CDFS and
UDF and any other PC disk format I've ever heard of. ;<)
Unless you plan to install Win9x/ME on that computer, you might as well go
ahead and convert your FAT32 volume to NTFS to gain the greater security,
both in the sense of secure from unauthorized access and in the sense of
secure from file system failures. There's no hurry, though; WinXP will be
happy with FAT32 as long as you are.
For any HD over about 137 GB, your hardware and software must be able to
support 48-bit addressing. If you don't know what that is, read these two
articles from Maxtor and PC Magazines. They both are over a year old; you
can have Google search for "big drives" to find over 5,000 articles.
Big Drives
http://www.maxtor.com/en/technologies/big_drives/
Live Large with Big Drives
http://www.pcmag.com/article2/0,4149,519303,00.asp
Given the size of the disk, should I format it as NTFS??
Yes. Microsoft limits WinXP's ability to create FAT32 volumes to only 32
GB. If you use Win98, you can format a volume as large as about 127 GB as
FAT32, and then WinXP can use the whole thing. But you'll have to divide
your 200 GB drive into multiple volumes if you insist on using FAT32. WinXP
will happily format the whole 200 GB as a single NTFS volume, if that's what
you want.
Can I use the disk management function to ensure that I
keep the same HD identity letter?
As you probably know, WinXP has its own system for assigning drive letters
depending on the configuration (HDs, partitions, CD/DVD drives, USB "thumb"
drives and other devices) that it finds each time it reboots. But we can
use Disk Management to assign the letters we want, and WinXP will try to
reassign these same letters each time. So, you can assign this big volume
as X:, for example, on your first WinXP machine. Then install it in the
second WinXP machine and use Disk Management to assign it letter X: there,
too. Just be sure not to pick an early letter (like D: or E

that might
get usurped by some new device when this computer is booted without the 200
GB HD plugged in.
RC