Path: utzoo!utgpu!watserv1!watmath!att!dptg!lzsc!hcj
From: hcj@lzsc.ATT.COM (HC Johnson)
Newsgroups: comp.sys.atari.st
Subject: Re: Hard Drive Problem
Summary: disk drivers (ahdi type) stop if lun 0 is not there
Message-ID: <1284@lzsc.ATT.COM>
Date: 12 Feb 90 13:53:26 GMT
References: <90021007304058@masnet.uucp> <QZ7$-+@rpi.edu>
Organization: AT&T BL Middletown/Lincroft NJ USA
Lines: 40

In article <QZ7$-+@rpi.edu>, brazil@pawl.rpi.edu (Timothy E. Onders) writes:
> I've got a problem I hope someone can help me with.  I've just recently
> upgraded my HD, and now I'm having some problems.
> 
> My old hard drive is a pre-production SH-204. It contains an NEC 20 meg
> mechanism, an Adaptatec 4000A controller, and an Atari host adaptor, 
> along with the power supply.
> 
> I purchased a Priam V185 mechanism to replace the NEC to bring the system
> I then booted the system with HDX 3.01 to format the drive. HDX reported

> that the "Selected drive is not responding. Check cables or inser a disk."
> I tried this a couple of times, and it just didn't work.
> 
> On a whim, I decided to power everything down and switch the little cable
> from the drive to the other connector on the Adaptatec, J1.  I then tried
> No luck. So, I tried changing the LUN setting in ICDFMT from 0 to 1. This
> time, it formatted. It also verified all the sectors and said that 

1. re LUN 0 -- you may have miss alligned the plug by 1 pin.
2. re LUN 1 -- The disk drivers ( ICD, SUPRA, BMS)  will stop looking
   at a SCSI device if LUN 0 is not ready.  They will then never test LUN 1.
   -- I rewrote mine to test LUN 1 also.
  
-- Of course, Atari, NEVER test LUN 1!

Your initial problem is typical of the problems with expanding/changing
a disk interface.  The drive is connected by 2 cables each of which may be 
upside down, and the LUN (small) cable can be plugged in 2 places.  Lots
of ways to do it wrong; only one way to do it right.  The good news is that
the wrong ways (listed above) do not seem to damage anything.

Now that you know it works, try going back to LUN0.  It'll probably work great.


Howard C. Johnson
ATT Bell Labs
=====NEW address====
att!lzsc!hcj
hcj@lzsc.att.com