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アップル担当者の説明

https://discussions.apple.com/message/22644033#22644033

これによると、「スリープ」ではなく、ハイバーネート（休眠）、省電力状態
のようです。
これを外付けHDDが認識できない。

電力制御は微妙なのでなかなか難しい。

2012 iMac there has been a change to the sleep function. The 2012 iMac enters into a very low power hibernate mode. The reason the external drives are ejected intermittently is because the drives do not have firmware that can sense the low power state. Also the low power state is not automatically entered at each sleep cycle. The 2010 iMac does not achieve this lower power state and therefore the drives will have no problem staying connected to this iMac. We may want to contact the external hard drive manufacturer for firmware updates that can detect the lower power hibernate mode on the 2012 iMac. I did notice in our notes here that the issue did not occur in the test user. After reviewing with the engineering department this issue may still return because very low power hibernate mode with 2012 iMac. Please let me know if you have any questions so I can further assist you."