I have two IronWolf Pro (ST10000NT001) drives in a QNAP DAS. Before putting them in the DAS, I used SeaChest to disable EPCfeature and powerBalanceFeature, and verified that the settings had stuck. However, I've noticed that the load cycle count will still occasionally increase even if the system hasn't been restarted. For example, I might see the load cycle on both drives increase by +1 in 24 ~hours.
I'm NOT worried about the increasing load cycle count in and of itself. It's not like it's happening at a rapid rate. I'm just concerned that it might be the symptom of some other issue with the DAS, such as random disconnections (though I can't see any evidence of this in Event Viewer).
So, my question is: Is there any reason for occasional head parking even when head parking has been disabled? For example, maybe it's part of some housekeeping routine of the drive?
Other notes:
- I've observed this behavior with the DAS on two different PCs.
- The DAS does not appear to have any kind of power saving/standby feature that spins down idle drives. I've only ever seen it spin down drives when it's disconnected, ejected, or when the host system shuts down, and the manual states as much.
- The Windows "Turn off drives after..." setting is set to Never/0.
- I've disabled all the relevant USB power saving features in Windows.
- This is not a case of Windows Update restarting the PC. I know this for sure because a restart causes two load cycles due to the disks being spun up twice during POST, and I'm only seeing the drives increase by one load cycle count at a time.
- I don't think it's a problem with the drives themselves since it's happening on both.