Why does my hard drive not enter hibernation?

The D5-300, D16 Thunderbolt3, and F4-300 models do not currently support hard drive hibernation.

The D2-310, D2 Clone, D4-300, D4-310, D5-300C, D2 Thunderbolt 3, D2 Thunderbolt 3 Plus, D4 Thunderbolt 3, and D5 Thunderbolt 3 do support hard drive hibernation; you should check whether your computer is communicating with other programs and devices effectively if any o these models fails to allow hibernation.