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Old 12-23-2012, 06:00 PM   #1
snmcdonald
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Back up Partition Table and MBR Manually


How do you back up your partition table for a GPT system?

For a regular MBR and MBR partition it would be:

Quote:
dd if=/dev/sda of=/etc/mbr.bak conv=notrunc bs=512 count=1
How many bytes must I copy for a GPT table?
 
Old 12-23-2012, 06:29 PM   #2
rknichols
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Quote:
Originally Posted by snmcdonald View Post
How do you back up your partition table for a GPT system?

For a regular MBR and MBR partition it would be:
Code:
dd if=/dev/sda of=/etc/mbr.bak conv=notrunc bs=512 count=1
Watch out! That saves only the layout of the primary partitions. If one of those is an extended partition, none of the info for the logical partitions within it will be saved.
Quote:
Originally Posted by snmcdonald View Post
How many bytes must I copy for a GPT table?
You have to calculate that from the fields in the GPT header.
 
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Old 12-23-2012, 08:32 PM   #3
snmcdonald
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Quote:
Originally Posted by rknichols View Post
Watch out! That saves only the layout of the primary partitions. If one of those is an extended partition, none of the info for the logical partitions within it will be saved.
Extended would be tricky as it appears to have varied offsets: wiki:EBR:examples

This has a nice solution: http://www.cyberciti.biz/faq/howto-copy-mbr/

Backup
Code:
# dd if=/dev/sda of=/tmp/backup-sda.mbr bs=512 count=1
# sfdisk -d /dev/sda > /tmp/backup-sda.sfdisk
Restore
Code:
# dd if=backup-sda.mbr of=/dev/sda
# sfdisk /dev/sda < backup-sda.sfdisk
Quote:
Originally Posted by rknichols View Post
You have to calculate that from the fields in the GPT header.
This blog gives the solution as:

Code:
# dd if=/dev/sda of=/etc/gpt.bak bs=512 count=34 conv=notrunc
GPT is 34 LBA... This assumes LBA is 512bytes... parted /dev/sda print or fdisk -l /dev/sda should list the sector/physical size.

Last edited by snmcdonald; 12-23-2012 at 08:59 PM.
 
  


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