make two disks appear as one volume

You will need to change the disks to dynamic volumes, then add them to a raid configuration..

http://www.techimo.com/articles/index.pl?photo=149

If I were you I would not be running 2003SBS on a 4gb drive?

It can be confusing but can be done..

Good Luck

Actually you can't expand the boot (system files) partition. Your best option is probably to mount that second drive to a folder on the C: drive (if most of your data will be located in a single folder).

See:
http://www.winnetmag.com/Articles/Index.cfm?ArticleID=8619

or

http://www.microsoft.com/resources/documentation/WindowsServ/2003/standard/proddocs/en-us/Default.asp?url=/resources/documentation/WindowsServ/2003/standard/proddocs/en-us/dm_extend_basic_volume.asp

cause c: is a system partition u can not add it to raid.The good option is to mount a folder to empety space on the 2nd disk.

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