zfs discuss - Dec 2011 - Using a data recovery company to get data from a drive?

As I posted in other messages I have had two drives fail in a raidz1 set.
One drive failed a month before the second and I didn''t notice before
the
second drive failed.

I would like to send this second drive to a data recovery company. 
I''ve
talked to Seagate (which is also the manufacture of the drive), who said
they could attempt to recover the drive, but since it was part of a ZFS
RAIDZ1 pool they couldn''t offer their "No Data ? No Charge
Guarantee".

Two questions:
 * is there a way to use the block checksums to discover how much data on a
single drive is corrupted?

 * Do the members of the list have any recommendations for data recovery
service company that knows about ZFS?

Thanks,

myers
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