The 4MMIBM.SYS driver is provided to support IBM 2.0Gb 4mm Tape Drive Option.
While support for this drive is also provided with the standard 4MMDAT.SYS
driver, the IBM tape drive will not be able to read tapes written by other
(non-IBM) 4mm DAT tape drives.  The reverse is also true, tapes written by
the IBM tape drive, using the 4MMDAT.SYS driver, will not be able to be read
by other (non-IBM tape drives).

Using this driver on the IBM tape drive will remove the majority of those
problems.  Any tape drive that is hardware compatible with the IBM tape
drive will be able to read a tape created with the IBM tape drive providing
the IBM tape drive is using the 4MMIBM.SYS driver.  The reverse is also true.
If a tape is created with the IBM tape drive (using the 4MMIBM.SYS driver),
any tape drive that is hardware compatible with the IBM tape drive will be
able to read that tape.

To install this driver, please copy all files in this directory to the root
directory of a floppy disk in drive A:, and label that disk 4MMIBM.

Start the SETUP application in Windows NT.

Select ADD/REMOVE TAPE DEVICES under the OPTIONS menu.

Click on the ADD button.

Select "OTHER (requires a disk from hardware manufacturer)"

Insert the disk labeled 4MMIBM into drive A: and click on OK.

Click on OK to approve the selection of IBM 4mm DAT.

Click on INSTALL to install the driver.

Click on OK to copy the files from drive A:.

Click on CLOSE to close the window.

Select EXIT from the OPTIONS menu to exit SETUP.

You will need to restart your computer for these changes to take effect.
Please choose SHUTDOWN from the FILE menu in Program Manager to do this.