Sony CRX100E User Manual page 14

Frame ground
When normally installed, the drive unit is not in contact with the
host computer directly and should be grounded. Connect the frame
ground tab to one of the host computer's ground cables.
Frame ground tab
Frame ground cable
The frame ground cable recommended has a AMP 1-480435-0
housing and 170203-2 or 60711-1 contacts.
14
Installing the Drive Unit into the Computer