[jonhohle]

> The APFS engineers I talked to cited strong ECC protection within Apple storage devices. Both NAND flash SSDs and magnetic media HDDs use redundant data to detect and correct errors. The Apple engineers contend that Apple devices basically don't return bogus data. NAND uses extra data, e.g. 128 bytes per 4KB page, so that errors can be corrected and detected. (For reference, ZFS uses a fixed size 32 byte checksum for blocks ranging from 512 bytes to megabytes. That's small by comparison, but bear in mind that the SSD's ECC is required for the expected analog variances within the media.) The devices have a bit error rate that's low enough to expect no errors over the device's lifetime.

https://arstechnica.com/gadgets/2016/06/a-zfs-developers-ana...

Dominic Giampaolo wrote BeFS, Spotlight, and now APFS.

In my 15-ish years running ZFS at home, the only time I’ve had corruption was when there was also noticeable hardware issues (cables, drives, enclosures). ZFS made them easy to deal with, but wouldn’t have helped if I wasn’t already running RAIDZ or mirrors. I’ve not looked recently, but in the past ZFS was extremely RAM hungry and relatively CPU expensive, not necessarily something optimized for mobile devices or battery life.