Re: CBM Drive Mechanisms

From: Marko Mäkelä (
Date: 1999-08-09 18:51:18

On Mon, 9 Aug 1999, Ethan Dicks wrote:

> D9060     Tandon  TM-602S (5.0Mb)
> D9090     Tandon  TM-603S (7.5Mb)

Are you sure about the capacities?  I assume that with "b" you mean "B"
(byte), not bit.  But I thought that third digit in the model number would
refer to the capacity in megabytes.  Converting the figures given by you
from real megabytes (2^10 bytes) to disk manufacturers' fake megabytes
(10^6 bytes) does not yield that much capacity, only 5.2*10^6 bytes and
7.7*10^6 bytes, respectively.

I'm not saying that you are wrong; I was just surprised that also the
larger model was that small.  But it would be impossible to use greater
disks than 16 megabytes using Commodore's format anyway (actually 64k
less, since tracks are numbered from 1).  Does anyone know what is the
size limit of REL files in the "better" version (the one that uses two
layers of abstraction, I think it's called "super side sectors")?  Is the
same version used both in the 1581 and in the old drives (8050 and the

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