Hi,
Windows Server 2003 as also Windows Home Server have not built in support for SATA/SAS hardware.
How is the SAS card configured? It should have no RAID features enabled, since RAID is not supported with Windows Home Server. Each disk should run as a single drive.
Drivers should be on the Server installation CD and you should be able to extract them on a different PC.
How did you put the drivers on the stick? They must be in their extracted form here (at least a .inf file and the driver file of type .sys belong to the set) and not as a setup program. Some drivers wish to be located in the root, others in a subfolder "drivers" or similar.
Maybe you have to check the contents of the txtsetup.oem file.
Could also be, that only a floppy drive will accepted at the text based stage of the setup later in the process.
Some interesting information you may find here:
http://thebackroomtech.com/2008/03/13/a-dell-poweredge-server-windows-2003-x64-and-the-battle-over-sas-raid-drivers/Best greetings from Germany
Olaf