On Tue, Feb 21, 2017 at 05:31:25PM +0100, Bartłomiej Solarz-Niesłuchowski wrote:
> Dear List,
>
> I have problem with setting label-id of dos partition table
> The problem occurs when i use sfdisk:
> 1. I "save" the partition table with sfdisk -d /dev/sda > saved.table (saved
> file has label-id of partition table)
> 2. then i restore this via sfdisk /dev/sda < saved.table
> BUT
> label-id of dos partition table can be changed in this operation e.g.:
> when i run command such:
> sfdisk -d /dev/sda > saved.table
> sfdisk /dev/sda < saved.table
> sfdisk -d /dev/sda
> sfdisk /dev/sda < saved.table
> sfdisk -d /dev/sda
> sfdisk /dev/sda < saved.table
> sfdisk -d /dev/sda
>
> each time when i restore partition table label-id of dos type partition
> table is changed!
>
> For me it is essential that label-id is set exactly as previous because
> after that i restore windows operationg system on this partitions and
> windows take care about label-id of boot disk partition table
>
> Currently i use fdisk (expert option i) for setting label-id of partition,
> but why it is not possible thru sfdisk?
Version? I'm not able to reproduce this problem (v2.28.2 as well as
upstream tree with incoming v2.30).
Karel
# modprobe scsi_debug dev_size_mb=100;
# echo ',,L' | sfdisk /dev/sdc
Disk /dev/sdc: 100 MiB, 104857600 bytes, 204800 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 524288 bytes
>>> Created a new DOS disklabel with disk identifier 0x6061f502.
Created a new partition 1 of type 'Linux' and of size 99 MiB.
/dev/sdc2:
New situation:
Device Boot Start End Sectors Size Id Type
/dev/sdc1 2048 204799 202752 99M 83 Linux
# sfdisk -d /dev/sdc > saved
# cat saved
label: dos
label-id: 0x6061f502
device: /dev/sdc
unit: sectors
/dev/sdc1 : start= 2048, size= 202752, type=83
# sfdisk /dev/sdc < saved
Disk /dev/sdc: 100 MiB, 104857600 bytes, 204800 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 524288 bytes
Disklabel type: dos
Disk identifier: 0x6061f502
Old situation:
Device Boot Start End Sectors Size Id Type
/dev/sdc1 2048 204799 202752 99M 83 Linux
>>> Script header accepted.
>>> Script header accepted.
>>> Script header accepted.
>>> Script header accepted.
>>> Created a new DOS disklabel with disk identifier 0x6061f502.
Created a new partition 1 of type 'Linux' and of size 99 MiB.
/dev/sdc2:
New situation:
Device Boot Start End Sectors Size Id Type
/dev/sdc1 2048 204799 202752 99M 83 Linux
# sfdisk -d /dev/sdc
label: dos
label-id: 0x6061f502
device: /dev/sdc
unit: sectors
/dev/sdc1 : start= 2048, size= 202752, type=83
>
> Best Regards
>
> --
> Bartłomiej Solarz-Niesłuchowski, Administrator WSISiZ
> e-mail: Bartlomiej.Solarz-Niesluchowski@xxxxxxxxxx
> tel. 223486547, fax 223486501
> JID: solarz@xxxxxxxxxxxxxxxxx
> 01-447 Warszawa, ul. Newelska 6, pokój 404, pon.-pt. 8-16
> Motto - Jak sobie pościelisz tak sie wyśpisz
>
>
--
Karel Zak <kzak@xxxxxxxxxx>
http://karelzak.blogspot.com
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