What is the best way to test a disk using 'format' under Solaris (Sparc)?

There seems to be several options, under the 'analyze' menu in format:

ANALYZE MENU:
read - read only test (doesn't harm SunOS)
refresh - read then write (doesn't harm data)
test - pattern testing (doesn't harm data)
write - write then read (corrupts data)
compare - write, read, compare (corrupts data)
purge - write, read, write (corrupts data)
verify - write entire disk, then verify (corrupts data)
print - display data buffer
setup - set analysis parameters
config - show analysis parameters
!<cmd> - execute <cmd> , then return
quit


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.

--
Dave (from the UK)

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