Anton B. Rang wrote:
Here's one possible reason that a read-only ZFS would be useful: DVD-ROM 
distribution.

built-in compression works for DVDs, too.

Sector errors on DVD are not uncommon. Writing a DVD in ZFS format with 
duplicated data blocks would help protect against that problem, at the cost of 
50% or so disk space. That sounds like a lot, but with BluRay etc. coming 
along, maybe paying a 50% penalty isn't too bad. (And if ZFS eventually 
supports RAID on a single disk, the penalty would be less.)

Also, traditionally, CD and DVD-ROMs have poor path data protection.
ZFS's end-to-end error checking is an advantage in such environments.
 -- richard-who-barely-survived-a-flaky-CD-ROM-cable-incident
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