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Restore disk image : Restore an image on 2nd disk (sdb) to 1st disk (sda) (Step by step)
  1. Boot the machine via Clonezilla live
  2. The boot menu of Clonezilla live
  3. Here we choose 800x600 mode, after pressing Enter, you will see Debian Linux booting process
  4. Choose language
  5. Choose keyboard layout
  6. Choose "Start Clonezilla"
  7. Choose "device-image" option
  8. Choose "local_dev" option to assign sdb1 as the image home
  9. Select sdb1 as image repository, then choose "restoredisk" option
  10. Select image name and destination disk
  11. Clonezilla is restoring disk image on 2nd disk (sdb) to 1st disk (sda)
Boot the machine via Clonezilla live
In this example, the machine has 2 disks, 1st disk's name is sda (device name in GNU/Linux), 2nd disk's device name is sdb. We already have a Clonezilla image in sdb, the image name is called "bookworm-2023-10-15-03-img":
root@debian:/home/partimag# ls -l
total 20
drwxr-xr-x 2 root root  4096 Oct 15 03:33 bookworm-2023-10-15-03-img
drwx------ 2 root root 16384 Oct 15 02:47 lost+found

root@debian:~# ls -lh /home/partimag/bookworm-2023-10-15-03-img/
total 1.3G
-rw-r--r-- 1 root root  901 Oct 15 03:33 blkdev.list
-rw-r--r-- 1 root root  770 Oct 15 03:33 blkid.list
-rw-r--r-- 1 root root 8.0K Oct 15 03:33 clonezilla-img
-rw-r--r-- 1 root root  218 Oct 15 03:33 dev-fs.list
-rw-r--r-- 1 root root    4 Oct 15 03:33 disk
-rw-r--r-- 1 root root 1.2K Oct 15 03:33 efi-nvram.dat
-rw-r--r-- 1 root root 118K Oct 15 03:33 Info-dmi.txt
-rw-r--r-- 1 root root  236 Oct 15 03:33 Info-img-id.txt
-rw-r--r-- 1 root root   67 Oct 15 03:33 Info-img-size.txt
-rw-r--r-- 1 root root  73K Oct 15 03:33 Info-lshw.txt
-rw-r--r-- 1 root root 4.6K Oct 15 03:33 Info-lspci.txt
-rw-r--r-- 1 root root  824 Oct 15 03:33 Info-OS-prober.txt
-rw-r--r-- 1 root root  198 Oct 15 03:33 Info-packages.txt
-rw-r--r-- 1 root root  101 Oct 15 03:33 Info-saved-by-cmd.txt
-rw-r--r-- 1 root root  980 Oct 15 03:33 Info-smart.txt
-rw-r--r-- 1 root root   15 Oct 15 03:33 parts
-rw------- 1 root root 2.5M Oct 15 03:32 sda1.vfat-ptcl-img.zst
-rw------- 1 root root 1.3G Oct 15 03:33 sda2.ext4-ptcl-img.zst
-rw------- 1 root root 315K Oct 15 03:33 sda4.ext4-ptcl-img.zst
-rw-r--r-- 1 root root   36 Oct 15 03:33 sda-chs.sf
-rw-r--r-- 1 root root  17K Oct 15 03:33 sda-gpt-1st
-rw-r--r-- 1 root root  16K Oct 15 03:33 sda-gpt-2nd
-rw-r--r-- 1 root root  18K Oct 15 03:33 sda-gpt.gdisk
-rw-r--r-- 1 root root  724 Oct 15 03:33 sda-gpt.sgdisk
-rw-r--r-- 1 root root  512 Oct 15 03:33 sda-mbr
-rw-r--r-- 1 root root  440 Oct 15 03:33 sda-pt.parted
-rw-r--r-- 1 root root  392 Oct 15 03:33 sda-pt.parted.compact
-rw-r--r-- 1 root root  684 Oct 15 03:33 sda-pt.sf
-rw-r--r-- 1 root root   53 Oct 15 03:33
Now the image "bookworm-2023-10-15-03-img" will be restored to disk sda.
Once you have the bootable Clonezilla Live CD/DVD or USB flash drive, you can boot the machine you want to clone via Clonezilla live. Remember to use the Clonezilla live CD or USB flash drive to boot the machine. For example, if you have Clonezilla Live in USB flash drive, you have to boot it via USB device (Ex. USB-HDD or USB-ZIP). If necessary, you can set the first boot priority in the BIOS as USB-HDD or USB-ZIP so that it can boot Clonezilla Live from your USB flash drive.
Here we take CD as an example, and this machine will boot in uEFI mode. You can either set CD as first boot priority in machine's BIOS like this:

Or by pressing a hotkey (e.g., Esc, F8, F9 or maybe F12) when you boot the machine, you will see the boot menu of BIOS like this:

Check your motherboard manual for more details about how to boot your machine via CD.

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