"Dave (from the UK)" <see-my-signature@southminster-branch-line.org.uk> wrote:
> I'm not sure of the difference between 'write', 'compare' and 'verify'.
> All seem to be a different way of saying the same thing to me, but I
> guess there must be a difference.

It is exactly what is written in the short description:

write:
writes a block, reads it back

compare:
like write, but the block read back is checked if it contains the
same data that has been written

verify:
write the entire disk, then read the disk back and compare.
This should eliminate caching effects on the disk drive

--
Daniel