Raid drivers not on Floppy but CD or USB?

WD Internal Drives Desktop & Mobile Drives
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Have you done some of the more simple things like bios updates?  How old is the system, and what size drive were you originally using for your system drive?  Server 2003 is rather old.  You would want to eliminate the possibility of drive size limitation in the bios.  Which usually only shows up with the system drive.  Any other secondary drives may be larger, but are being passed off to Windows for management, so the BIOS may not stop boot up if it doesn’t recognize them.