Path: utzoo!attcan!uunet!mcvax!cernvax!ethz!jungfrau!marvin
From: marvin@jungfrau.UUCP (Rico und Jan)
Newsgroups: comp.sys.ibm.pc
Subject: Re: RLL controller
Summary: Problems with RLL controller
Keywords: Adaptec RLL Tandon harddisk
Message-ID: <694@jungfrau.UUCP>
Date: 27 Nov 88 20:18:18 GMT
References: <299@deimos.cis.ksu.edu> <400@mccc.UUCP> <1038@pilchuck.Data-IO.COM> <407@mccc.UUCP> <458@octopus.UUCP>
Reply-To: marvin@jungfrau.UUCP
Organization: Mathematics Department, ETH Zuerich
Lines: 24

In article <458@octopus.UUCP> pete@octopus.UUCP (Pete Holzmann) writes:
>But to the point: I posted a list of known RLL-able drives early this
>year. In summary: any drive is RLLable except for certain ST225's: those
                   ^^^^^^^^^^^^^^^^^^^^
>with S/N under 1,000,000 and/or rev level less than MLC3. I still have
>not experienced a single problem with an MFM->RLL upgrade that wasn't
>due to a controller problem. Pick the correct Adaptec controller and you'll
                                               ^^^^^^^^^^^^^^^^^^
>have no pain!
>
>Pete (Holzmann, from Octopus)

I have an Adaptec 4070 RLL controller and a Tandon TM262 harddisk which
is a 20 Mega 3.5" MFM disk. I get a lot of read errors especially on the
inner tracks of the disk. These errors occur not always, but more or
less randomly and usualyy it's just a couple of bits per sector that are
reversed. The outer half of the disk (the upper 300 cylinders) usually
cause no problems.
I've heard quite often, that Adaptec controllers are so great (and I
don't doubt it), and I've also been told that the Tandon disk should
have no problems with RLL, since they have plated media. But tell me
anyone, why  do I have all these reversed bits on the disk ??? Pete ??

Thanks, Tomas