You need to partition the disk and then format the partitions. To do that you can use Disk Utility in mac, it can be found in applications/utilities. Or in windows 2000/XP you can do the same in control panel/administrative tools/computer management/disk management. For use in both operting systems, it's preferred to format the disk to Fat32. Usually with external disks and modern windows or mac you don't need any special drivers.
Windows already has a standard ATA/IDE driver for hard drives. The biggest problem I have with hard drives and windows is assigning a drive letter to make it show up.
If you have a extra PCI card (IDE, SATA, Firewire, USB) you are installing, that will need drivers, but I've never had to install a driver to USE a hard drive.
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You don't need those drivers for OS X, and they are optional for PC.
If you have some Backup software like some external drives have, it may be a good idea to use that.
If I don't have the driver, then how will my Windows PC read anything on the external drive?
I can't set it up on Windows, so I'm trying to set it up on the Apple.
help?
If you have a extra PCI card (IDE, SATA, Firewire, USB) you are installing, that will need drivers, but I've never had to install a driver to USE a hard drive.