[356] in linux-scsi channel archive
Re: How can I use 4GB SCSI HDD?
daemon@ATHENA.MIT.EDU (Rob Janssen reading Linux mailingl)
Thu Jul 13 01:41:49 1995
From: linux@pe1chl.ampr.org (Rob Janssen reading Linux mailinglist)
To: drew@poohsticks.org (Drew Eckhardt)
Date: Wed, 12 Jul 1995 13:50:42 +0200 (MET DST)
Cc: linux@minkowski.etri.re.kr, linux-scsi@vger.rutgers.edu
In-Reply-To: <199507120134.TAA03065@chopper.poohsticks.org> from "Drew Eckhardt" at Jul 11, 95 07:34:56 pm
Reply-To: linux-vger@wab-tis.rabobank.nl
According to Drew Eckhardt:
> In message <9507101500.AA11395@minkowski.etri.re.kr>, linux@minkowski.etri.re.k
> r writes:
> >I'm using Adaptec SCSI 1542CF adaptor and 1GB Micropolis
> >HDD. There was no problem. Yesterday, I was going to attach
> >Sequel 4GB SCSI HDD. But fdisk warned number of cylinder of
> >the HDD exceed 1024 with following message:
>
> >The number of cylinders for this disk is set to 3814.
> >This is larger than 1024, and may cause problems with some software.
>
> "some software" is defined as DOS.
>
> >Partition 2 has different physical/logical beginnings (non-Linux?):
> > logical=(1024, 0, 1)
> >Partition 2 has different physical/logical endings:
> > logical=(2047, 63, 32)
> >Partition 3 has different physical/logical beginnings (non-Linux?):
> > logical=(2048, 0, 1)
> >Partition 3 has different physical/logical endings:
> > logical=(3813, 63, 32)
>
> This is normal; the physical fields only have 10 bits allocated for
> cylinder; they wrap when they end up being different.
Maybe it is better to change some of the messages in fdisk, because this
question is a VFAQ and it will occur only more as disk capacity increases.
"may cause problems with some software" could better be
"may cause problems with some operating systems (e.g. DOS)".
People think that "some software" can also mean "some applications under
Linux", and that is unfounded.
Also, the checks for "different physical/logical begin/end" could be
done modulo 1024 cylinders, so that it does not issue these warnings in
the case of a >1024 cylinder disk and *correct* partititions.
Rob
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