Subject: Re: disklabel/fdisk confusion
To: Rasputin <rasputin@shikima.mine.nu>
From: FUKAUMI Naoki <naoki@fukaumi.org>
List: port-hpcmips
Date: 04/18/2002 01:28:45
At Wed, 17 Apr 2002 14:16:52 +0100,
Rasputin wrote:
> =FDISK==========================================
>
> NetBSD disklabel disk geometry:
> cylinders: 978 heads: 8 sectors/track: 32 (256 sectors/cylinder)
>
> BIOS disk geometry:
> cylinders: 978 heads: 8 sectors/track: 32 (256 sectors/cylinder)
>
> Partition table:
> 0: sysid 6 (Primary 'big' DOS, 16-bit FAT (> 32MB))
> start 32, size 12000 (5 MB), flag 0x80
> beg: cylinder 0, head 1, sector 1
> end: cylinder 46, head 7, sector 32
sysid 4 is better. (not important)
> 1: sysid 169 (NetBSD)
> start 12033, size 250000 (122 MB), flag 0x0
> beg: cylinder 47, head 0, sector 2
> end: cylinder 977, head 7, sector 32
you can use 'start 12032'.
size 250000 is wrong.
978 * 8 * 32 (chs) = total sector is 250368
start 12033 + size 250000 = last sector is 262032 (wrong)
if you set start 12032, right size is 238336.
> 2: <UNUSED>
> 3: <UNUSED>
>
> =DISKLABEL==========================================
>
> # /dev/rwd1d:
> type: ESDI
> disk: TOSHIBA THNCF128
> label: fictitious
> flags:
> bytes/sector: 512
> sectors/track: 32
> tracks/cylinder: 8
> sectors/cylinder: 256
> cylinders: 978
> total sectors: 250368
> rpm: 3600
> interleave: 1
> trackskew: 0
> cylinderskew: 0
> headswitch: 0 # microseconds
> track-to-track seek: 0 # microseconds
> drivedata: 0
>
> 8 partitions:
> # size offset fstype [fsize bsize cpg/sgs]
> a: 235520 47 4.2BSD 1024 8192 16 # (Cyl. 0*- 920*)
> b: 14592 235776 swap # (Cyl. 921 - 977)
> c: 235520 12033 unused 0 0 # (Cyl. 47*- 967*)
> d: 250368 0 unused 0 0 # (Cyl. 0 - 977)
> e: 12000 32 MSDOS # (Cyl. 0*- 46)
partition a and e are overwrapped. a: offset 47 is wrong.
(size and offset (start) is sector #, not cylinder #)
partition c size is strange.
if you can erase all data, try to clear current fdisk/disklabel completely
$ dd if=/dev/zero of=/dev/rwd1d count=100
^^^^^ <- CF device name
then create new disklabel.
FYI
If you want to add MSDOS partition infomation to NetBSD disklabel,
mbrlabel command is very useful. start and size # will be auto-generated
from fdisk infomation.
MSDOS partition can be formated on NetBSD with newfs_msdos command.
--
FUKAUMI Naoki