While NTFS is limited to a volume size limit of 256 TB, windows XP 32-bit only supports HDD's up to 2TB in size. This is because XP only supports disks in MBR format, and the max MBR supports is 2TB. You may have issues installing Windows XP on these or any new HDD as they all use Advanced Format Drives which Windows XP can have some issues with before SP3.