> 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 - 11:49:16 BST