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Date:      Thu, 25 Oct 2001 19:21:23 +1300
From:      Chris Pearce <ferox@paradise.net.nz>
To:        freebsd-questions@freebsd.org
Subject:   Harddrive reporting wrong RPM
Message-ID:  <01102519212300.00352@Ferox>

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Hey,

I recently installed FreeBSD4.3, and I noticed my
harddrive seems to be running slower than it has
done under Windoze and Linux. I ran 'disklabel ad0'
and it told me that my rpm of my HD is 3600, which
is wrong; the drives only 9 months old.

If I run 'disklabel -e ad0' and changed the rpm
manually, will it speed up the drive, or could it
damage it instead? (Thought I'd better check before
I tried.....)

Is there any other ways to speed up the HD, like
doing something funky with DMAs?

Output of 'disklabel ad0':

# /dev/ad0c:
type: ESDI
disk: ad0s3
label:
flags:
bytes/sector: 512
sectors/track: 63
tracks/cylinder: 240
sectors/cylinder: 15120
cylinders: 641
sectors/unit: 9691920
rpm: 3600
interleave: 1
trackskew: 0
cylinderskew: 0
headswitch: 0           # milliseconds
track-to-track seek: 0  # milliseconds
drivedata: 0
 
8 partitions:
#        size   offset    fstype   [fsize bsize bps/cpg]
  a:   204800        0    4.2BSD     1024  8192    16   # (Cyl.    0 - 13*)
  b:  1056624   204800      swap                        # (Cyl.   13*- 83*)
  c:  9691920        0    unused        0     0         # (Cyl.    0 - 640)
  e:   102400  1261424    4.2BSD     1024  8192    16   # (Cyl.   83*- 90*)
  f:  1024000  1363824    4.2BSD     1024  8192    16   # (Cyl.   90*- 157*)
  g:  7304096  2387824    4.2BSD     1024  8192    16   # (Cyl.  157*- 640*)


Thanks,
Chris Pearce.



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