REMOVABL.TXT - Removable drives under OS/2

A removable drive works as a floppy or a hard drive under OS/2 2.x.
IBM only supports it as a floppy drive.

Floppy drive:  A removable drive can be used as a floppy drive if installed
under OS/2 2.x.  If the drive reports itself as SCSI type 0 (DASD), then
OS2DASD will recognize it, and treat it like a high capacity floppy.
FDISKPM will not see the drive.  The data from a DOS system can be read
under OS/2 if the drive has been formatted as a floppy with the AFDISK
utility.  Under the DRIVES icon on the OS/2 desktop, there will be a floppy
icon for the removable drive.  The OS/2 CONFIG.SYS file must have:

     BASEDEV=AHA154X.ADD /V

Hard drive: A removable drive can be used as a hard drive if LOCKDRV.FLT
is installed in the OS/2 CONFIG.SYS file.  (LOCKDRV.EXE is available on the
Adptec Technical Support BBS).  The drive acts as a hard drive in this case.
FDISKPM will see the drive, and can read/write data saved under DOS, and
vice-versa.  However, you cannot remove the cartridge once the operating
system has been loaded.  The system must be reset to change the cartridge.
The CONFIG.SYS file must have:

 BASEDEV=AHA154X.AD /V
   BASEDEV=LOCKDRV.FLT /UNIT:0

If a drive reports itself as type 7 (Optical) then the standard file systems 
will not be accessible without a third party driver.  IBM makes one for their 
drive, OPTICAL.SYS.  There may be a jumper on the drive to select type 0 or
type 7, so check your manual (please do not confuse drive type with SCSI id).
OS2ASPI.DMD (included with OS/2 2.x) must be installed with a third party
software.  Following is an example of a drive with SCSI id 2.  We first
need to disable DASD manager for id 2 and then load OS2ASPI.DMD.

   BASEDEV=AHA154X.ADD /V /A:0 /!DM:2
      BASEDEV=OS2ASPI.DMD

In above examples, an Adaptec AHA-1542 controller is used.  In addition to 
the above statements, OS2SCSI.DMD and OS2DASD.DMD must be loaded in the 
CONFIG.SYS file.