On Thu, 2005-05-26 at 13:06 -0400, Deron Meranda wrote: > > Would cp /dev/zero /dev/hda do the same thing? > > No. I wish people would stop saying this. It's not true, cp works just fine and as expected on devices (as does cat, btw), as long as the device doesn't require special handling (like CD burners, tapes, etc). > cp operates at the filesystem level, while dd operates > at the device level. So? Isn't /dev/hda a filesystem object? It can be written to just like /dev/zero can be read from. > cp actually wouldn't work because /dev/hda > is not a filesystem (although it contains an image of a filesystem > which you access by mounting it first). cp doesn't expect filesystems as arguments. > Also even if cp could > work, you still might want to erase the non-filesystem portions > of your disk (e.g., partition tables, boot blocks, swap partitions, > LVM structures, etc.) No. Overwriting /dev/hda clobbers the whole disk, MBR, hook, line and sinker. Cheers Steffen.
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