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Date:      Sat, 19 Jul 1997 14:11:36 +0930 (CST)
From:      Michael Smith <msmith@atrad.adelaide.edu.au>
To:        hlew@www2.shoppersnet.com (Howard Lew)
Cc:        rb@gid.co.uk, hackers@FreeBSD.ORG
Subject:   Re: Iomega Zip
Message-ID:  <199707190441.OAA12625@genesis.atrad.adelaide.edu.au>
In-Reply-To: <Pine.BSF.3.91.970718210723.29226F-100000@www2.shoppersnet.com> from Howard Lew at "Jul 18, 97 09:09:11 pm"

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Howard Lew stands accused of saying:
> 
> The probe doesn't look right, but it works:

The probe is _exactly_ right.

> sd0 at scbus0 target 5 lun 0
> sd0: Direct-Access 
> sd0: ILLEGAL REQUEST asc:24,0 Invalid field in CDB
> sd0 could not mode sense (4). Using ficticious geometry

The drive has refused a MODE SENSE command, so it's not possible to
establish its geometry.  Geometry is only (really) relevant for
processing the MBR.  Instead, the driver will fake some sensible
falues.

> sd0: NOT READY asc:3a,0 Medium not present
> sd0: could not get size
> 0MB (0 512 byte sectors)

The driver has attempted to interrogate the drive to obtain its total
size in sectors.  The drive reports an error because you haven't
inserted a disk.  This is common for removables, particularly those
that support more than one media size.

> sd0: with 0 cyls, 64 heads, and an average 32 sectors/track

And this is the resultant fake geometry, given a size of 0 sectors.  It's
good enough.

-- 
]] Mike Smith, Software Engineer        msmith@gsoft.com.au             [[
]] Genesis Software                     genesis@gsoft.com.au            [[
]] High-speed data acquisition and      (GSM mobile)     0411-222-496   [[
]] realtime instrument control.         (ph)          +61-8-8267-3493   [[
]] Unix hardware collector.             "Where are your PEZ?" The Tick  [[



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