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This drive has two IEEE 1394 bays (1) and one USB 1.1 Full Speed / USB 2.0 High Speed bay (3), protected with a sliding lid (2).
Figure 21: Back of the HP DVD Writer dvd420e
1 - IEEE 1394 bays
2 - Sliding lid
3 - USB 2.0 High Speed bay (compatible with USB 1.1 Full Speed)
4 - Power socket