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When I call IVdsDiskOnline::Offline, disk becomes offline and its volumes disappear from the system.

Does the physical HDD continue spinning, wasting energy and wearing the hardware?

If yes, how do I stop it?

If it matters, I’m using an average desktop PC with Intel® 9 Series Chipset Family SATA AHCI Controller, and SATA HDD.

Thanks in advance.

Soonts
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    Wear is not significantly induced by keeping the drive on (assuming a good thermal situation). Start/stop cycles, on the other hand, do wear the drive noticeably. (Many smart estimates allow 600k restarts, Google saw a slightly higher failure rate allowing restarts vs always on). – Mitch Oct 21 '15 at 18:15
  • Well, my #1 priority wasn't wear, it was spin on delays. Here’s the project page, BTW: https://turnoffhdd.codeplex.com/ and it works more or less OK. However minimizing wear would also be nice. – Soonts Oct 21 '15 at 18:40

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