If you see 'disk not ejected properly' on your Mac Pro (2023)

If an internal SATA drive unexpectedly disconnects from your Mac Pro, update to macOS Ventura 13.5 or later.

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.

To resolve this issue, update to macOS Ventura 13.5 or later.