Re: CBM D9090 Update

From: Ethan Dicks <>
Date: Mon, 7 Dec 2009 13:29:57 -0500
Message-ID: <>
On 12/7/09, B Degnan <> wrote:
> Ethan,
> I may have an ST251 model in my IBM stuff.  I'd much rather use one of
> those because they have the same height as the 603s, more or less.

Oh?  The ST251s I know of are the same profile as the ST225.

> If the 603s had 153 cylinders and 6 heads, and the ST251 has 803 cylinders
> 6 heads, I assume the remaining cylinders are ignored?  What will the
> controller do when it gets to cylinder 154?

With the factory firmware, the controller will never ask the drive to
step past 154, no matter if it's an ST225 or ST251.  There was some
work done some time ago to patch the firmware to extend the max
cylinder out to the maximum possible, but due to the
track/sector-number scheme, the largest filesystem is something around
16MB (with patching, the last cylinder that's possible to use is
either 255 or 254).

I myself have not tried this, but ISTR that success was reported by
someone else.


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Received on 2009-12-07 19:00:04

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