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Alternate Solution for WD Green Drive Auto-sleep
Authored by: Makosuke on May 05, '10 03:22:49PM

I'd at one point run across this hint when trying to figure out why my WD Green drives, connected to my Mac via a FW800 enclosure, would partly spin down CONSTANTLY, regardless of whether the Energy Saver pref was checked or not.

Turns out that among the power saving features of the GP series is auto head park, a feature that essentially puts the drives into a partial sleep state; the drives spin at least partway down (maybe all the way) and park the head after a period of inactivity. Problem: The default setting on the drives (both an older EADS model I was using and the new 64MB cache Advanced Format EARS models) is to do this after 8 seconds. Yes, 8 seconds. Meaning that they'll sort-of-sleep after almost ANY period of non-constant use, which is infuriating when you're trying to work on them.

Fortunately, WD has a utility that allows you to change the timing on (or disable completely) this feature. XLR8YourMac has a tutorial:

...which worked well enough for me. After disabling the head park (I figure if I want it to sleep I can just use the OS setting and change it with this hint or pmset) it appears to behave in a more normal manner.

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