Cross-linked files?

Does anyone know ot a utility that will scan a disk/partition for
cross-linked files and

a) List the cross-linked files
b1) List the cluster chains for the files, or
b2) Do a common/left/right difference (a bit like windiff) on the files...
(how much data is common to both files, how much is in each and not in the
other)

I'd like more than the summary that e.g. chkdsk would provide - have
searched the web (a lot!) and haven't found anything so far

TIA

--
Julian I-Do-Stuff

Some Vista stuff, but mostly just Stuff at http://berossus,blogspot.com