Loading HPFS.IFS (WARP 4)

Use the undocumented switch /FORCE for this filesystem to force immediate 
access to a "dirty" HPFS partition. HPFS partitions get "dirty" if you 
don't shutdown OS/2 (e.g. after crashing the system). 

Use the undocumented switch /QUIET for this filesystem to suppress all 
messages from CHKDSK. Note that /QUIET cannot be the last parameter. 

Example: 

 
  IFS=C:\OS2\BOOT\HPFS.IFS /FORCE /AUTOCHECK:C

Warning:  Use these parameters with extreme care! Use it only when you 
          really need it!

 (WARP 4 only!, Source: Team OS/2 WEB pages)