>> Ooo, here's an interesting question - what is the size of /dev/sda? Is
>> it the size of the special file, or the device to which it refers?
>
> It's the size of the special file.

Figures.

> If you want to know the size on the
> device, you'll have to parse the output of df.

Only if the device is *mounted*. ;-)

I believe we used sdisk to do the job.

> Come to think of it, you should also test that /dev/sba is a block
> device before trying to dd to it using [ -b /dev/sda ]

Yes, that was the solution I chose in the end. It's an easy fix.

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