Will drive "sleep" (spin down) when connected via Thunderbolt, or does it run continuously unless you manually switch it off?

Concerned about having the hard drive spinning 24/7. Would hope that while inactive or when iMac is in sleep mode or turned off, the LaCie would follow suit. Apparently it does via USB 3, but given info implies Thunderbolt connection won't do this.

Any help would be appreciated. It would be a deal breaker for me.

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    Just tried to put iMac to sleep, then after a few seconds the blue light on the Thunderbolt 3 TB that I use exclusively for Aperture flashed then turned off. Awakening from sleep light turned on. Hope this helps.

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