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Newsgroups: comp.os.386bsd.questions,comp.os.386bsd.misc
Subject: disklabel problem, please help! [URGENT]
Message-ID: <CEtAuK.3sw@latcs1.lat.oz.au>
From: wongm@latcs1.lat.oz.au (M.C. Wong)
Date: Wed, 13 Oct 1993 01:30:19 GMT
Organization: Comp Sci, La Trobe Uni, Australia
Lines: 73
Hi,
Here is my config :
- OS : 386bsd-0.1 + pk-0.2.4
- Hard disk : Conner Peripheral 3544 (544MB) with following partitions :
FDISK partition
----------------
Partition Type Volume-Label Mbytes System Usage
---------------------------------------------------------
C:1 PRI-DOS DOS6 150 FAT16 30%
2 NON-DOS 350 70%
(386bsd)
PFDISK partition
----------------
geometry 1023 16 63 (cyls heads sectors)
# ID First(cyl) Last(cyl) Name # start,length(sectors)
---------------------------------------------------------------------------
1 6 0 304 DOSbig # 63, 307377
2 0 0 0 empty # 0, 0
3 0 0 0 empty # 0, 0
4 165 305 1022 unkown # 307440, 723744
(386bsd)
# note : last(4): phys=(1023, 15, 63) logical=(1022, 15, 63)
- Within the 386bsd partition I had parition a: followed by b: of 5 Mb, ie
a: is about 345Mb, ie :
a: (cyl. 305 - X) , 4.2BSD, [fsize = 1024, bsize = 8192, cpg = 16]
b: (cyl. X - 1022), swap.
c: (cyl. 305 - 1022), note I reserve cyl 1023 unused!
I am not too sure if the size and offset field can be derived from the
PFDISK information ? I can't remember what is X. Also, sec/cyl = 1008,
bytes/sec = 512 bytes. But with a bit of calculation in backward, I get the
following : (Am I correct ?)
size(sect) begin(sect) end(sect) begin(cyl) end(cyl)
--------------------------------------------------------------------
a: 713504 307440 1019936 305 1011.84127
b: 10240 (5Mb) 1019936 1030176 1011.84127 1022
c: 1030176 307440 1030176 305 1022
Why did I get end cyl 1011.84127 for a: ? Can I simply round it up to 1012
without losing any data?
I edited the disklabel last night (disklabel -e -r wd0) to attempt to add
in an entry e: for my MSDOS partition, but somehow it screwed up and I lost
all the disklabel, ie my system will no longer boot from wd0. If I boot from
the fixit floppy, I can no longer mount wd0a, as it comlaint wd0a not
configured, even though it is there, and disklabel -r wd0 gives me all the disk
geometry without BSD partition info at all. And the worst thing is I can't
quite remeber the offset and end cylinders (sectors) in the original disklabel.
All I know is that, my swap (b:) is still the original 5Mb, and the rest is a:.
My questions are :
1) If I figure out all of the missing figures in the above disklabel entries
correctly and re-disklabel wd0 from floppy. will I be able to restore my
system ? Are the above backward calculation correct ? If re-disklabel
doesn't work, is there any other alternative ?
2) I only have 1 fixit floppy which is read only, without the right mount
that can remount my root to writable, no termcap file in /etc. So I am
stuck with no other alternative.
I wonder can someone help me out with this problem, ie verify if 1) will
work , and if so please can you send me a bootable floppies (raw format)
with the right tools (vi, termcap, mount etc) to fix the problem ?
Many thanks in advance and email replies please as I am in deep shit!
- wongm@latcs1.lat.oz.au (M.C Wong)
--
- wongm@latcs1.lat.oz.au