Tandon TM 100 5 1/4" drives

From: Don Maslin <donm_at_cts.com>
Date: Tue Oct 19 15:00:14 1999

On Tue, 19 Oct 1999, Fred Cisin (XenoSoft) wrote:

By the way, in my earlier remarks about the 100 tpi Tandon drive, I
alleged that it was a TM100-4A. WRONG! It is a TM100-4R. Guess I
need new glasses :)

                                                 - don

> > According to my Tandon OEM Operating and Service Manual
> > for the TM100-1 and TM100-2:
> >
> > Tracks per inch 48 TPI both drives
> > Tracks per drive TM100-1 40 tracks, TM100-2 80 tracks
>
> While "CORRECT" in some twisted perverted way, that is VERY misleading.
> Many folks reading that would misinterpret it as implying 80 tracks per
> side (aka 96TPI), which it ISN'T. The -2 is the double sided version of
> the -1. It is 40 tracks per side. Perhaps it's time to do as the
> hard-drive manufacturers did and change the terminology. Both the -1 and
> -2 are 40 CYLINDER.
>
> > Disk Rotational Speed 300 RPM +/- 1.5%
> > Motor Start Time 250 milliseconds
> > Motor Stop Time 150 milliseconds
> > Seek Time,track to track 5 milliseconds
> > Head Settling Time 15 milliseconds
> > Ave Track Access Time 75 milliseconds
> > Typ. Recording Modes FM,MFM,MMFM
> > Data Transfer Rate 250,000 bits per second
>
> "Data Transfer Rate" is not a meaningful spec in this context!
> Particularly following the acknowledgement that the drive was suitable for
> recording modes besides MFM!
>
> > Unformated Cap. TM100-1 250Kb per disk, TM100-2 500Kb per disk
> "Unformatted Cap." is assumed to be MFM.
>
>
> BTW, the IBM "Hardware Maintenance and Service" manuals for the PC and XT
> have a lot of pretty pictures of mechanical disassembly of Tandon TM 100-2
> drives.
>
> --
> Grumpy Ol' Fred cisin_at_xenosoft.com
>
>
Received on Tue Oct 19 1999 - 15:00:14 BST

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