this post was submitted on 04 Feb 2026
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Dual-actuator heads always scare me. Hard disks are already insane precision mechanical instruments.
They scare you because you're concerned about failure rate?
More like the complexity and precision needed to make it work, at mass produced volumes. But I guess you could translate that to feat of unreliability.
Undoubtedly going to have a higher failure rate, however in my experience WD's enterprise drives are extremely high reliability regardless.
Once these hit the surplus market in ~5 years they'll be neat (if we get them in SATA) for ZFS RAID arrays; faster rebuild speeds will be nice.
I already pre-bought drives for the replacement / expansion of my ZFS pool as the current drives fail so I'm locked into old technology for likely many years. 😔
It looks like the pivots are on opposite sides of the disk platters, which means that if one fails you essentially lose access to the data on that side.
That's not really appreciably different from the same failure happening in a single-pivot drive, though it is more mechanical complexity packed into the same amount of space.
I'm not sure what the failure rates on HDD pivots are like. In my own experience the control board or motor is more likely to fail.