On Tuesday 24 July 2001 09:31, Douglas J. Hunley wrote:
> I understand that 'dd if=/dev/zero of=/dev/xx bs=512k count=1'
> will zero out the MBR, but does it also get the partition table? or should
> a count of 2 (3?) be used?
> thanks!
oooh, that aint what you want at all. you specified a scribble of one single
block of 512,000 bytes !!!!
dd if=/dev/zero of=/dev/xx bs=512 count=1
The second part of your question is that the partition info and the bios
signature is contained in the last 64+2 bytes of the first sector. This
means, writing zeros to the entire sector (as you intended) _also_ destroys
the partition info. (which is what you want)
Destroying the AA55 bios signature incidentally, renders this drive as a non
boot device from bios. The bios algorithm is, it will boot from the first
hard drive it sees, not the first hard drive in the system.
fdisk will discover this 'fact' and consider the drive virgin (no partitions).
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