Backup MBR an Partition Table

[ccc]

hi

Howto backup MBR an Partition Table of freeBSD using Frenzy LiveCD ?

 

[Beastie]

% dd if=/dev/adN of=mbr_adN bs=512 count=1
changing N accordingly.

But you need a writable location for the output file, so you can use a pendrive you've already mounted or you could simply do this from FreeBSD itself.

 

[ccc]

Thx, but howto restore just a Partition Table?

 

[jem]

fdisk(8)

It's able to output a disks slice table to a config file, and read the config file back in to partition the disk.

 

[ccc]

fdisk(8)

It's able to output a disks slice table to a config file, and read the config file back in to partition the disk.

Can you pls give some more details how it works using fdisk?

 

[Beastie]

So you have not read the man page yet. You should use the -f option with a "configfile". And there is a very detailed "configfile" at the end of the page. Read it!

 

[gcooper@]

% dd if=/dev/adN of=mbr_adN bs=512 count=1
changing N accordingly.

But you need a writable location for the output file, so you can use a pendrive you've already mounted or you could simply do this from FreeBSD itself.

That works with a standard MBR, but not a non-conventional one, like GPT, made larger to accommodate ZFS -- see the examples section in the gpart manpage for more details.