Jim C. Brown a écrit :
I have some trouble using losetup to mount partitions
from the host.
I never realized how difficult it was to interpret error messages written in
a foreign language.
Ok, sorry, in plain english messages are:
[EMAIL PROTECTED]:/usr/src/qemu-test# fdisk -l zipslack.img
You must set cylinders.
You can do this from the extra functions menu.
Disk zipslack.img: 0 MB, 0 bytes
16 heads, 63 sectors/track, 0 cylinders
Units = cylinders of 1008 * 512 = 516096 bytes
Device Boot Start End Blocks Id System
zipslack.img1 1 66 33232+ 82 Linux swap
zipslack.img2 67 609 273672 83 Linux
[EMAIL PROTECTED]:/usr/src/qemu-test#
and mounting the file with an offset of $((67*512)) doesn't work
[EMAIL PROTECTED]:/usr/src/qemu-test# sfdisk zipslack.img
Warning: zipslack.img is not a block device
Disk zipslack.img: cannot get geometry
Disk zipslack.img: 0 cylinders, 0 heads, 0 sectors/track
Old situation:
Warning: The partition table looks like it was made
for C/H/S=*/16/63 (instead of 0/0/0).
For this listing I'll assume that geometry.
Units = cylinders of 516096 bytes, blocks of 1024 bytes, counting from 0
Device Boot Start End #cyls #blocks Id System
zipslack.img1 0+ 65 66- 33232+ 82 Linux swap
zipslack.img2 66 608 543 273672 83 Linux
zipslack.img3 0 - 0 0 0 Empty
zipslack.img4 0 - 0 0 0 Empty
Input in the following format; absent fields get a default value.
<start> <size> <type [E,S,L,X,hex]> <bootable [-,*]> <c,h,s> <c,h,s>
Usually you only need to specify <start> and <size> (and perhaps <type>).
zipslack.img1 :
And mounting with $((66*516096)) is ok.
And now, my questions: why this?
Because you were passing the wrong value as the offset. You have to multipy
the cylinder with the number of heads and number of sectors per head and such.
what's this number given by sfdisk: 516096 ?
Apparently, head*sectors per head*bytes per sector ... my fdisk doesn't show
that number though.
fdisk doesn't give the good values?
thanks
It does, but they are hard to interpret unless you understand disk geometries.
I really recommend using lomount or some similar tool to figure out these
offsets for you. (Incidently, lomount doesn't care about disk geometry - it
uses the absolute sector values in the partition table.)
I receive a mail that says:
fdisk -l zipslack.img is not the same as fdisk- lu zipslack :
[EMAIL PROTECTED]:/usr/src/qemu-test# fdisk -lu zipslack.img
You must set cylinders.
You can do this from the extra functions menu.
Disk zipslack.img: 0 MB, 0 bytes
16 heads, 63 sectors/track, 0 cylinders, total 0 sectors
Units = sectors of 1 * 512 = 512 bytes
Device Boot Start End Blocks Id System
zipslack.img1 63 66527 33232+ 82 Linux swap
zipslack.img2 66528 613871 273672 83 Linux
and incidently $((66*516096))=$((66528*512))
thanks.
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