Re: CBM900 hard disk timeout

From: MikeS <>
Date: Thu, 28 Aug 2014 13:49:08 -0400
Message-ID: <4958A2FAF48F4A6C83866852E872F575@310e2>
Well, there's MFM and there's MFM...

----- Original Message ----- 
From: "William Levak" <wlevak@SDF.ORG>
To: <>
Sent: Thursday, August 28, 2014 1:31 AM
Subject: Re: CBM900 hard disk timeout

On Tue, 26 Aug 2014, Micha~B Pleban wrote:

> Hello!
> William Levak wrote:
>> There are utility programs that will read any sector on a hard drive
>> directly, ignoring the directory and partition tables. I don't have one
>> that works on SASI drives.
> More precisely, this is not a SASI drive. This is a MFM drive, attached
> to a SASI-to-MFM controller, attached to some kind of DMA-to-SASI
> interface. The drive itself is a plain old MFM disk.
> Therefore I ordered a MFM ISA controller, and I will try the procedures
> you mentioned above when it arrives.

I do have a routine that reads MFM.  I also have a routine that does low 
level format on MFM.

An old copy of Norton Utilities should work also.
SDF Public Access UNIX System -

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Received on 2014-08-28 18:00:02

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