I think 446 contains just the boot program in MBR, and 512 contains both
boot program and partition table. If you do not change partition, you
may use 512.
On Tue, 19 Jun 2001, Peter Jay Salzman wrote:
> i'd like to know how to backup the master boot record, but the trouble is
> that i don't know how "big" the mbr is.
>
> according to the lilo mini-howto:
>
> dd if=/dev/hda of=blah bs=446 count=1
>
> according to some documents i've found on google:
>
> dd if=/dev/hda of=blah bs=512 count=1
>
> so is it 446 bytes or 512 bytes?
>
> also, a question about dd. according to the man page, bs=BYTE tells dd to
> read and write BYTE bytes. count=BLOCK tells dd to copy only BLOCK input
> blocks.
>
> what is a block?
>
> pete
>
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