W dniu 2017-02-21 o 17:49, Karel Zak pisze:
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).
root@sysresccd /mnt % sfdisk /dev/sdb < henwar.2017.sdb.sfdisk Checking that no-one is using this disk right now ... OK Disk /dev/sdb: 489.1 GiB, 525112713216 bytes, 1025610768 sectors Units: sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes >>> Script header accepted. >>> Script header accepted. >>> Script header accepted. >>> Script header accepted. >>> Created a new DOS disklabel with disk identifier 0x1f257e1a. Created a new partition 1 of type 'W95 FAT32 (LBA)' and of size 500 MiB./dev/sdb2: Created a new partition 2 of type 'HPFS/NTFS/exFAT' and of size 488.6 GiB.
/dev/sdb3: New situation: Device Boot Start End Sectors Size Id Type /dev/sdb1 * 2048 1026047 1024000 500M c W95 FAT32 (LBA) /dev/sdb2 1026048 1025607679 1024581632 488.6G 7 HPFS/NTFS/exFAT The partition table has been altered. Calling ioctl() to re-read partition table. Syncing disks. root@sysresccd /mnt % sfdisk -d /dev/sdb label: dos label-id: 0x1f257e1a device: /dev/sdb unit: sectors /dev/sdb1 : start= 2048, size= 1024000, type=c, bootable /dev/sdb2 : start= 1026048, size= 1024581632, type=7 root@sysresccd /mnt % less henwar.2017.sdb.sfdisk label: dos label-id: 0x908b462c device: /dev/sdb unit: sectors /dev/sdb1 : start= 2048, size= 1024000, type=c, bootable /dev/sdb2 : start= 1026048, size= 1024581632, type=7 root@sysresccd /mnt % sfdisk -v sfdisk from util-linux 2.28.2 As you see sfdisk creates different label-id than it has in file
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=83Best 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
-- 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
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