I have been using Seagate free agent GO drives on a windows 2003 server for backup. Sometimes I get a "Delayed Write Failed : Windows was unable to save all the data for the file F:\$Mft." error. I emailed Seagate technical support and the reply was "The product is not supported on Windows 2003 server."
The WD elements external USB does not list 2003 as a supported OS.
What is a good supported external USB drive to use with Windows 2003 server?
I expect the issue arises from the drive being USB bus powered.
Possible solutions:
Edit: There is a dock available for the Freeagent Go drives, which uses a 2xA USB calble like I mentioned above.
Sometimes this is just a licensing issue.
External drives often come bundled with backup software intended mainly for consumer/home systems. The vendor of this software will also have an enterprise-grade product aimed at servers, and they don't want their enterprise customers using this cheaper option instead. Thus, the terms of the software will prohibit you from using it with a Windows Server operating system. Sometimes these terms are enforced better than others.