Re: [users] dd question
also sprach Joerg Johannes (on Sun, 01 Jul 2001 02:09:49PM +0200):
> 1.) Just to be sure:
> dd if=/dev/zero of=/dev/sda1
> will overwrite any data on sda1 with zeroes, but leave sda2, sda3 and
> the mbr untouched?
yes.
> 2.) To backup my mbr I do
> dd if=/dev/sda of=/flopyy/mbr.sda bs=512 count=1
> and to put it back
> dd if=/floppy/mbr.sda of=/dev/sda bs=512 count=2
why count=2 when writing back? count=1 should do.
> Will this be enough to get lilo back after windos new install?
why not just rerun lilo?
> 3.) During all this dd'ing, /dev/sda must be *completely* unmounted?
no, /dev/sda1 *should* be unmounted while dd'ing over it. but since
you are writing 0's, there's not much else that can break if you'd
leave it mounted. but sure, unmount the entire thing!
martin; (greetings from the heart of the sun.)
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