No additional drivers are needed for these operating systems. The drivers for external drives (such as FreeAgent, OneTouch, Seagate portable, and Seagate pushbutton lines) are included as part of Vista and normally load automatically, but occasionally the drivers will need to be loaded manually. See Knowledge Base article 201235 for more details.
3.5-Inch External Hard Drive Drivers
Windows XP / 2000 / Me
No additional drivers are needed for these operating systems. The drivers that ship with these operating systems should automatically load when the drive is connected.
If using Windows XP, service pack 1 added support for USB 2.0. If you are running Windows XP without a service pack, then you may not see the full performance of the drive.
Windows 2000 Professional
Windows 2000 service pack 4 made several enhancements including adding support for USB 2.0 to Windows 2000. If you are running Windows 2000 without service pack 4 or higher, you may not see the full performance of your drive.
Certain OEM installations of Windows Me call for the file USBNTMAP.SYS while attempting to load drivers for the external drive. This file can be located on the Windows Me installation or recovery CD in the WIN9XBASE2.CAB folder.
Windows 98 SE
When using this external drive with Windows 98 SE, then additional drivers are needed.