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This command installs the High Performance File System. Without this command you can't access any HPFS formatted drives.

IFS=C:\OS2\HPFS.IFS [parameter]

Parameters:

• /C:value or /CACHE:value

  Determines the cache size.
  Value can be D or in the range from 1 to 2048 .
  If set to D the cache size is 10% of RAM up to the maximum of 2048 Kbytes.
  Default is D
  This value is expressed in Kbytes.

• /CRECL:value

  Specifies the maximum file size to be cached. If a file is greater than this value the file is not cached.
  Value can be in the range from 2 to 64 in multiplies of 2.
  Default = 4
  This value is expressed in Kbytes.

• /AC:drives

  The AC parameter specifies which drives should be checked by chkdsk.exe during start up after an improper shut down. Add only the drive letter without the colon. If you want to run chkdsk.exe on a drive at every start up add a plus sign (+) in front of the drive letter.

• /F:level

  Indicates on which level chkdsk.exe should be run.
  Level can be in the range from 1 to 3 .
  Default is 2

• /Quiet

  If this option is set up, the Hpfs.ifs driver will show no error messages at boot up. This parameter can not be the last parameter!

• /Force

  With this option set you can get access to a disk that is marked as bad and is not in the Autocheck list (the /AC: parameter). But beware there are may errors in the file system, so run chkdsk as soon as possible.

The following line sets up a two megabyte cache size, allows only files which are not greater than 32 Kbytes to be cached and autochecks drive C: and drive D: after an improper shut down:

Platform Support:

OS/2 2.x	OS/2 3.0	OS/2 4.0
Yes	Yes	Yes