Flexible Disk Drives / TEAC FD-55 / Info

Homepage

The FD-55 Family

The TEAC mini flexible disk drive family FD-55 includes three generations. The second generation carries the letter V and the third the letter R.

type 2nd 3rd specs
A AV -/- SS, DD, 48 tpi, 40 tracks, 250 KByte
B BV BR DS, DD, 48 tpi, 80 tracks, 500 KByte
E EV -/- SS, QD, 96 tpi, 80 tracks, 500 KByte
F FV FR DS, QD, 96 tpi, 160 tracks, 1 MByte
G GV GR DS, HD, 96 tpi, 160 tracks, 1.6 MByte
GF GFV GFR DS, HD, 96 tpi, 154 tracks, 1.6 MByte
DS, QD, 96 tpi, 160 tracks, 1.0 MByte
DS, DD, 48 tpi, 80 tracks, 500 KByte
GS -/- -/- DS, HD, 96 tpi, 154 tracks, 1.6 MByte
DS, QD, 96 tpi, 160 tracks, 1.0 MByte
DS, DD, 48 tpi, 80 tracks, 500 KByte

In addition to the type designation, there is also an identifier for the control board and a 2, 3 or 4-digit number. For example FD-55BR-501-U.

Type B is the double sided version of type A and type F is the double sided version of type E.

Type E and F are not supported on IBM compatible systems! Basically, however, the MS-DOS operating system already supports quad-density drives!

The MS-DOS Enzyclopedia, 1988, p. 865

FORMAT [drive] /4 - formats a standard double sided, double density disk (360 KB) on a quad-density disk drive.

Note: Each OEM determines which switches will be supported by the FORMAT utility included with the versions of MS-DOS sold with its computers.

Type A, B, E, F have a disk rotational speed of 300 RPM and type G of 360 RPM.

The FD-55G is equivalent to an 8 inch, double sided, double density flexible disk drive. The FD-55GS is a SCSI version.

In contrast to the usual 150 Ohm, the type A and F use a resistor pack of 330 Ohm (at least for my drives).

To be continued ... but if you download the following documents you will find "almost" everything about the TEAC FD-55 series.

Documents

Brochures

Specification