You're up against the DOS 6.22 2GB limit that is intrinsic. Either accept this and creat 2GB+2GB+1GB partitions or use a harddrive manager program that fudges the MBR to fool DOS into believing the disk is smaller. Look for "2GB limit" with Google, hundred of answers like
http://www.computing.net/dos/wwwboard/forum/9749.html Quite possibly your old BIOSes can't cope with over 2GB either
http://www.computeruser.com/articles...1,0604,01.html or
http://www.powerload.fsnet.co.uk/notes.htm and
http://www.spcug.org/reviews/bl0107.htm etc.
If you don't come right thru all this email me and I'll concentrate the 'ol mind on it.