ASROCK 939S56-M Manual page 24

4. If you want to remove any one SATA device and hope that the data can
be protected. You can click the grid in front of "SATAx Safely Remove",
and then click the button "OK" to remove it. The following message will
be popup to tell you that hard disk can be removed safely now.
5. If you plug in a SATA device, the resident hot-plug utility will popup and
show the following message. You can click the "ok" button to close this
message box and the device information will show on it.
6. If you plug out a SATA device without selecting the "SATAx Safely
Remove", the data in this SATA device may be lost. The following mes-
sage will be popup to tell you the SATA device has be removed.
7. If you plug in a SATA device but the Hot-Plug utility cannot find any device
plugged in, you can plug out this SATA device and plug in it again by some
times. If you still can't find any SATA device plugged in, you can click the
grid in front of "Reset SATAx", and then click the button "OK" to reset it.
And try again the action that plugging out and plugging in. Then you
should find the SATA device information on the Hot-Plug utility.