이번에 발표된 신형 맥북 프로에서 특정 SATA 하드디스크를 장착하면, 절전 모드에서 깨어난 후에 디스크의 연결이 끊어지는 문제가 있다고 합니다. 애플은 이 문제를 알고 있으며 앞으로 나올 macOS 업데이트에서 수정할 계획입니다. 

Learn what to do if an internal SATA drive unexpectedly disconnects from your Mac Pro.

Certain models of internal SATA drives might unexpectedly disconnect from your computer after your Mac wakes from sleep. This can occur if your Mac automatically goes to sleep or if you manually put your Mac to sleep. If you see a message that your disk was not ejected properly, you can restart your Mac to reconnect to the drive. 

To prevent your Mac from automatically going to sleep, change the sleep settings on your Mac: 

1. Choose Apple menu  > System Settings, then click Displays.
2. Click Advanced, then turn on "Prevent automatic sleeping when the display is off."
3. Click Done.

Apple is aware of this issue and resolution is planned for a future macOS update.

https://support.apple.com/en-us/HT213778