[BBC-Micro] Technomatic hard disk units

[Mike Tomlinson]

In article <14ED7E9C5ABD43ED8F4CD9FA84154E11.MAI at ukhosting.ltd.uk>, Ian
Wolstenholme <BBCMailingList at beebmaster.co.uk> writes

>According to the Adaptec manual, the ACB4070 is an RLL
>controller and not an MFM-and-RLL controller (that's my
>understanding of it anyway, but I could be wrong since
>it does appear to run contrary to popular belief) so I'm not
>sure how wise is it to run it with an MFM drive.

It's not.  The ST225 is unsuitable for RLL encoding.  That's why you get
errors verifying the drive; you're storing 50% more data on it than it
was designed for.

Looking at your photos, that little lot must get awfully hot crammed
into the box like that.  If I were you, I'd be looking for an RLL-
capable 3.5" drive in a 3.5"-to-5.25" adapter (one with ventilation
grilles on the front) to replace the ST225.

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