ISC 2K file system problems

[Jon Block]

  I am trying to create a 2K file system in the usr2 partition. The command
  I was using is "mkfs2K /dev/dsk/0s4 154836 1 306". This seems to create
  a file system, and I can mount it with "mount -f S52K /dev/dsk/0s4 /usr2.
  However, when I try to modify the file system by cp, mkdir, etc..., I get
  an error 
	panic: iodone. S52K buffer with b_contig > 1
	trying to dump 928 pages.

 At this point I have to reboot my system, which is by the way.
	Gateway 2000 386-20
	8MB Memory
	Seagate 150MB ESDI Drive, w WD controller

  Please mail me any help you can give, as I can't find any information in
  the documentation I have, and I can't afford the cost of support.