On Fri, Oct 8, 2010 at 2:02 PM, Mills, James <[email protected]> wrote: > Hello all. > > I have a situation where I need to create a "raw" disk image using > parted. This disk image is challenging in that it needs to maintain > the number of heads (255) and sectors (63) no matter how large the > image is. Here are the basic steps I am following currently: > > dd if=/dev/zero of=test bs=1M count=100 > losetup /dev/loop1 test > parted -s /dev/loop1 mklabel msdos > > At this point, the disk image looks good in terms of heads and > sectors... if I use fdisk to look at it: > > # fdisk -l /dev/loop1 > > Disk /dev/loop1: 104 MB, 104857600 bytes > 255 heads, 63 sectors/track, 12 cylinders > > But parted already has a different idea: > > # parted -s /dev/loop1 unit chs p > Model: (file) > Disk /dev/loop1: 1599,3,31 > Sector size (logical/physical): 512B/512B > BIOS cylinder,head,sector geometry: 1600,4,32. Each cylinder is 65.5kB. > > At this point, I can use sfdisk or fdisk to partition the disk image > and maintain the required heads/sectors. Unfortunately, I cannot > figure out how to do this with parted. > > Any help would be greatly appreciated! > James >
Replying to my own post, I have a bit more information around this behavior. Hopefully it will help someone on the list point me in the right direction. I have 4 machines: Ubuntu 9.10 x86 running parted 1.8.8.1.159-1e0e Ubuntu 10.04 amd64 running parted 2.2 Ubuntu 10.04 x86 running parted 2.2 Fedora Core 13 x86 running parted 1.9 On all four boxes, I am using the following steps (as root) losetup -d /dev/loop1 dd if=/dev/zero of=test bs=1M count=100 losetup /dev/loop1 test parted -s /dev/loop1 mklabel msdos At this point, I run both "fdisk -l /dev/loop1" and "parted /dev/loop1 -s unit chs p" Version 1.8.8 reports the same CHS numbers using both fdisk and parted (12,255,63). All other versions report: fdisk - 12,255,63 parted - 1600,4,32 Can anyone help me understand what has changed that would cause me to get such disparate behavior? Thanks! James Mills _______________________________________________ parted-devel mailing list [email protected] http://lists.alioth.debian.org/mailman/listinfo/parted-devel
