Found this iso useful, it’s a Windows XP Recovery Console (~7MB):
http://www.thecomputerparamedic.com/files/rc.iso

Supported commands:

   attrib    del        fixboot   more     set
   batch     delete     fixmbr    mkdir    systemroot
   bootcfg   dir        format    more     type
   cd        disable    help      net
   chdir     diskpart   listsvc   rd
   chkdsk    enable     logon     ren
   cls       exit       map       rename
   copy      expand     md        rmdir

More info:
http://support.microsoft.com/kb/314058/