On Sat, 3 Sep 2011 18:09:10 -0400 Eric Griffith <egriffith92@xxxxxxxxx> wrote: > Whats up guys, Was planning on re-install Arch on my laptop, started > writing a couple scripts to handle the usual things I do. One of the > NEW things im going to be trying is grub2. Now, the Grub2 wiki says to > run > > dd if=/dev/zero of=/dev/sda bs=440 count=1 > > to wipe out grub-legacy from the MBR. > > And since the Arch-devs removed "No Bootloader" as an option in the > AIF, you can't follow the "during installation" instructions for > Grub2. > > Here's my problem, just by sheer luck was I roaming the web today, and > noticed a few other threads (in various forums for various distros / > blogs) and they all had a similar command to run if youre grub-legacy > was screwed and you needed to write over it. The only issue, and the > reason for this email? They had different commands. > > Not completly different, but different enough that raised an eyebrow. > In > > dd if=/dev/zero of=/dev/sda bs=440 count=1 > > They had various numbers for bs=, some 440, some 446, some 506, and > some 512. Normally I would've just shrugged and followed the wiki, but > notice on one said that if you zero out too far, you wipe out hte > partition table...which I wouldn't enjoy haha. > > So can anyone confirm that the command above, from the wiki, is > correct? And that it IS 440, and not something different. I'd hate to > pick the wrong one and zero out my partition table, or not completly > zero out grub-legacy and run into a whole different set of problems. > > Thanks! grub gets installed in the first 440 (446) bytes, then some disk-specific data (optional), the rest takes up the partition table up to the 512th byte. look also at https://secure.wikimedia.org/wikipedia/en/wiki/Master_boot_record
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