dd command to create bootable iso image of hard disk, grub is installed

[Saqlain Abbas]

Hi,

Is it possible to use dd command to create a bootable ISO image from hardisk (in which grub is installed) ?

I use below command:

dd if=/dev/sda of=/mnt/sdb/my.iso

I am able to create ISO, but when i try to boot i get error, Operating System not found

/dev/sda got 4 partition and grub is installed in partition 1, filesystem is ext3

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Kind Regards,

Saqlain Abbas.