On Mar 15, 2013, at 8:51 AM, Lennart Sorensen <lsore...@csclub.uwaterloo.ca> wrote:
> On Thu, Mar 14, 2013 at 08:56:18PM -0600, Chris Murphy wrote: >> Right, for a 4Kn drive, to read LBA 1 and get the GPT header I'd need: >> >> sudo dd if=/dev/disk3 skip=8 count=1 2>/dev/null | hexdump -C > > Wouldn't using 'bs=4096' make things simpler and more obvious? How would it? These structures are still predicated on a 512 byte block. The MBR is always 512 bytes, but on a 4096/4096 4Kn drive, LBA 0 is 4096 bytes. So if I don't want to see 3584 bytes of useless garbage, I can't set the dd block size to 4096, or I get extra information. If I want to see just the GPT header, which while only ~92 bytes, by spec it gets its own sector, there's far less superfluous information using a bs of 512 bytes than 4096 bytes. Chris Murphy _______________________________________________ Grub-devel mailing list Grub-devel@gnu.org https://lists.gnu.org/mailman/listinfo/grub-devel
