Problem with sfdisk

circus78 · 05-08-2013, 02:13 PM

Hi, I'm trying to copy partiton table from sda (500 GB) to sdb (750 GB), but I got this error:

Quote:

# sfdisk -d /dev/sda /dev/sdb
# partition table of /dev/sda
unit: sectors

/dev/sda1 : start= 2048, size=945309696, Id=fd
/dev/sda2 : start=945311744, size= 31459328, Id=fd
/dev/sda3 : start= 0, size= 0, Id= 0
/dev/sda4 : start= 0, size= 0, Id= 0

sfdisk: ERROR: sector 0 does not have an msdos signature
/dev/sdb: unrecognized partition table type
No partitions found

My goal is to reasseble my two raid (1) device.
I know that I will waste 250 GB as /dev/sdb is greater, but I don't care.

This is my sda's fdisk:

Quote:

# fdisk -l /dev/sda

Disk /dev/sda: 500.1 GB, 500107862016 bytes
255 heads, 63 sectors/track, 60801 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x49e2fd2f

Device Boot Start End Blocks Id System
/dev/sda1 1 58843 472654848 fd Linux raid autodetect
/dev/sda2 58843 60802 15729664 fd Linux raid autodetect

and this is sdb (I KNOW it's greater!):

Quote:

# fdisk -l /dev/sdb

Disk /dev/sdb: 750.2 GB, 750156374016 bytes
255 heads, 63 sectors/track, 91201 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000

Disk /dev/sdb doesn't contain a valid partition table

How can I solve this?
Thank you

smallpond · 05-08-2013, 02:39 PM

I think you are trying to do:

Code:

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

sfdisk is obsolete, as it will not work with large disks, or disks formatted with GPT tables.
In near future you should be using parted.