I received an email from you this morning via PCA, it has obviously come to the wrong person as you can see I haven't posted to this thread. Whether it has been misdirected by PCA, or an error on your part I don't know. Sorry I can't help except to say that there are two forms of frmatting HD's FAT & NTFS,NTFS is much more reliable and safer. Perhaps cga will come back to you on this.
If you are not buying a hdd larger than 137GB (hdd manufacturer's size), then your current system should be able to recognise the new hdd properly (both BIOS and operating system), given that you are already using a 60GB hdd, as cga says.
If you are considering hdd larger than 137GB, you will need to check that your BIOS supports 48-bit LBA (just LBA is not enough). If it doesn't, you'll need to check whether there is a BIOS update which gives that extra support. As to the OS, w2k with SP3 or SP4 supports disks larger than 137GB.
If not sure, stick to a hdd below the 137GB limit.
w2k and XP cannot format partitions larger than 32GB (Windows size) with the FAT32 file system. It's just a limitation built into the OS's by Microsoft. These OS's can however read and write to FAT32 partitions larger than 32GB (formatted in other ways, such as using a 98 boot floppy). But FAT32 partitions larger than 32GB are supposed to slow down hard disk performance. But since CDH is using w2k, he/she will probably be using NTFS anyway.