[ltp] cloning 14G drives
Tue, 30 Nov 1999 09:15:21 -0500
Mark Kennedy wrote:
> Rob Mayoff wrote:
> > | Seems like I hear a lot of suffering associated with 14G drives. I
> > | wonder if there is a particular model that just sucks w.r.t. linux?
> > | These two drives: are they identical models?
> > The problem with the 14 GB drive is that it does not correctly identify
> > itself to the system. The standard way for a drive to tell the system
> > that it's larger than 8 GB is to claim that it has a raw geometry of
> > 16383/16/63. The IBM 14 GB drive claims to have a raw geometry of
> > 16383/15/63. The kernel doesn't recognize this as the magic "big disk"
> > geometry so it assumes the drive is reporting its actual geometry.
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> ok, between your last message, section 11 of the large disk HOWTO,
> and the output of hdparm, i'm beginning to understand.
> so i should specify a logical CHS geometry of 16383/16/63 (instead
> of 1826/240/63) to trigger the large disk support and everything
> else will just work because the disk driver uses logical block
> addressing (ignores the CHS geometry) and the number of logical
> blocks reported by the disk (27,609,120 in this case or 13.1G)
> is correct?
> if so, then bill needs to change the large disk hint on his
> linux/thinkpad page.
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i tried the dd to /dev/null on the train home last night with
16383/16/63 and it still stopped at the 8G barrier. so there
is definitely a kernel or a kernel version dependence.
more when i discover it...
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