Date: Sat, 12 Oct 1996 16:47:21 -0400 (EDT) From: Barry Masterson <jbarrm@panix.com> To: Freebsd-questions <questions@freebsd.org> Subject: Cylinders & heads: dmesg VS fdisk Message-ID: <Pine.BSF.3.91.961012163320.476A-100000@jbarrm.dialup.access.net>
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When I run 'dmesg' & 'fdisk', the values for heads & cylinders are
different for the same disk:
[dmesg]
wdc0: unit 0 (wd0): <QUANTUM FIREBALL1080A>
wd0: 1039MB (2128896 sectors), 2112 cyls, 16 heads, 63 S/T, 512 B/S
^^^^^^^^^ ^^^^^^^^
[fdisk]
******* Working on device /dev/rwd0 *******
parameters extracted from in-core disklabel are:
cylinders=528 heads=64 sectors/track=63 (4032 blks/cyl)
^^^^^^^^^^^^^ ^^^^^^^^
My question is; Why is there a difference in cylinders, & heads on wd0 ;
why would dmesg & fdisk show different values?
I'm adding a second disk. dmesg reports the following, which corresponds
with the manufacturers specs:
[dmesg]
wdc1: unit 0 (wd2): <QUANTUM LIGHTNING 540A>
wd2: 516MB (1057280 sectors), 1120 cyls, 16 heads, 59 S/T, 512 B/S
I ran 'fdisk -i' on the second disk, and entered what I believe are
the correct values, which fdisk reports as follows:
[fdisk]
******* Working on device /dev/rwd2 *******
parameters extracted from in-core disklabel are:
cylinders=1120 heads=16 sectors/track=59 (944 blks/cyl)
Here the cylinder & head values are the same. Is there some calculation
I'm missing when I'm in fdisk? Or, is this how it should look; dmesg and
fdisk agree in cylinder & head values?
Thank you
Barry Masterson
jbarrm@panix.com
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FreeBSD 2.1.5-R
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