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Flash drives used for top-level vdevs or SLOG devices should have power failure protection to protect both their own metadata and flushed data. Protection of unflushed data does not occur on mechanical drives and therefore is not a requirement of filesystems in general, which include ZFS.
 
=== NVMe drives with power failure protection ===
 
A non-exhaustive list of NVMe drives with power failure protection is as follows:
 
* Intel 750
* Intel DC P3500/P3600/P3608/P3700
* Samsung PM963 (M.2 form factor)
* Samsung PM1725/PM1725a
* Samsung XS1715
* Toshiba ZD6300
=== SAS drives with power failure protection ===
* Toshiba HK4E/HK3E2
* Toshiba HK4R/HK3R2/HK3R
 
=== NVMe drives with power failure protection ===
 
A non-exhaustive list of NVMe drives with power failure protection is as follows:
 
* Intel 750
* Intel DC P3500/P3600/P3608/P3700
* Samsung PM963 (M.2 form factor)
* Samsung PM1725/PM1725a
* Samsung XS1715
* Toshiba ZD6300
=== Criteria/process for inclusion into these lists ===
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