Is possible to "Switch Off" the HDD from dock?

[Mordega]

That's the question, I'm interested in buy the 32+500gb version, and I was wondering if you can simply switch off the HDD improving the battery duration.

Thanks

[azazel1024]

No.

Or at least not really. You can eject it, since it is a USB device, and that should cause the drive to spin down.

[Tao]

Would this help save on battery drain on these models?

Know people are concerned about this on the 500gb dock models so looking for solutions to minimise impact on battery.