Skip to content

Latest commit

 

History

History
60 lines (45 loc) · 1.55 KB

partitions.md

File metadata and controls

60 lines (45 loc) · 1.55 KB
Raw

Partitions

Copy partition schema

Dump layout of sda to a file, replace sda entries with sdb and import on sdb:

sfdisk -d /dev/sda > /tmp/partitions
sed -i 's/sda/sdb/g' /tmp/partitions
sfdisk /dev/sdb < /tmp/partitions

Copy partition schema directly from sda to sdb in one step:

sfdisk -d /dev/sda | sfdisk /dev/sdb

In case of a GPT partition, sgdisk utility should be used:

sgdisk --backup=table /dev/sda
sgdisk --load-backup=table /dev/sdb
sgdisk -G /dev/sdb

Extract partition from block device

First list the contents of the drive:

# sfdisk -l -uS image-file
Disk mwex-sda: cannot get geometry

Disk mwex-sda: 17750 cylinders, 255 heads, 63 sectors/track
Warning: extended partition does not start at a cylinder boundary.
DOS and Linux will interpret the contents differently.
Units = sectors of 512 bytes, counting from 0

   Device Boot    Start       End   #sectors  Id  System
   mwex-sda1   *      2048    206847     204800  83  Linux
   mwex-sda2        206848  50538495   50331648  83  Linux
   mwex-sda3      50538496  67315711   16777216  82  Linux swap / Solaris
   mwex-sda4      67315712 285155327  217839616   5  Extended
   mwex-sda5      67317760 285155327  217837568  83  Linux

Now, suppose you want to extract partition number 2. You can see that it starts at block 4267680 and is 137985600 blocks long. This translates into:

dd if=image-file of=partition3-file skip=206848 count=50331648

Peeking into the contents of the partition is as easy as:

# mount -o loop,ro partition3-file /mnt/hack