I want to disable APM on this hdd because of the aggressive head parking. The drive has accumulated 768 load/unload cycles in the 65 hours that its been on and honestly the clicking is annoying.
I tried using HDAT2. I unplugged the sata power cable so that DCO frozen is disabled, restored DCO, changed APM settings correctly, and then modified DCO without any error prompt yet APM does not get disabled.
Can I try anything else to permanently disable APM?

Set 0 or never power off hdd in power settings

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<itch>
скратчи
If you can keep your head when all about you are losing theirs, you probably don't fully understand the situation. ... Mr Kipling

Maybe your OS/Windows/BIOS or whatever is setting the APM on back again ?

Check system configuration and try the drive with another system to confirm that the APM setting are sticking. Maybe you didsomething wrong ?

Try to power the drive off and on as soon as you set APM with hdat and make sure that the clicking on idle is gone. If so and if it only returns when you re-boot the system i would say that the OS is changing the settings again.

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