[fedora-arm] Backing up an mSD image via dd
I want to take a 'check point' in my work. It takes ~3 hours after
putting an image on the mSD card to update it...
So I was thinking of using:
dd if=/dev/sdb of=/home/rgm/arm/F26-server-minimal.img bs=4096
conv=notrunc,noerror; sync
But the card is 8Gb and only part is used:
Disk /dev/sdb: 7.4 GiB, 7969177600 bytes, 15564800 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
Disklabel type: dos
Disk identifier: 0x337b9d3d
Device Boot Start End Sectors Size Id Type
/dev/sdb1 2048 61439 59392 29M c W95 FAT32 (LBA)
/dev/sdb2 * 61440 1060863 999424 488M 83 Linux
/dev/sdb3 1060864 2060287 999424 488M 82 Linux swap / Solaris
/dev/sdb4 2060288 6942719 4882432 2.3G 82 Linux swap / Solaris
How can I instruct dd to only copy to that past sector so I can later
put it back to another card?
thanks