Floppy Disk Drives / TEAC FD-55F / DOS

TEAC FD-55F running under PC/MS-DOS?

In my first article about the TEAC FD-55F I wrote that this floppy drive cannot be used under PC or MS-DOS. DOS only supports 360 KByte and 1.2 MByte floppy disks for the 5.25 inch drives. 720 KB is only available for the 3.5 inch drives.

Why then this article? Sometimes I am a bit persistent and I asked myself: "Is there perhaps a way? The answer is YES. All you need is a tiny little program (2M-XBIOS) and a 16-bit ISA/IDE HDD/HDD controller.

The following links describe the basic procedure very precisely.

  1. www.vcfed.org
  2. minuszerodegrees.net

The special feature for the 5.25"/720KB drive lies solely in the following program line (CONFIG.SYS).


Drive B: is assigned the parameter 3 (720 KByte). After the restart you can format a DD floppy disk with FORMAT B:.

I couldn't believe it myself at first, but it worked. Of course you can't use the floppy disks formatted in this way on any other computer! It is also only about the principle.

My hardware