ZFS is able to detect corruption thanks to checksumming, but for single drives 
(regular folk-pcs) it doesn't help much unless it can correct them. I've been 
searching and can't find anything on the topic, so here goes:

1. Can ZFS do parity data on a single drive? e.g. x% parity for all writes, 
recover on checksum error.
2. If not, why not? I imagine it would have been a killer feature.

I guess you could possibly do it by partitioning the single drive and running 
raidz(2) on the partitions, but that would lose you way more space than e.g. 
10%. Also not practical for OS drive.
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