LiteOn LH-18A1P Manual page 13

Configuration (C)
Current configuration:
Two hard disk drives connected as Master and Slave devices on the primary IDE port;
CD-ROM or DVD-ROM connected as Master device on the secondary IDE port.
Setting instructions:
Disconnect the CD-ROM or DVD-ROM from the secondary IDE port, change the
jumper to Slave, and re-connect it to the secondary IDE port. Set the DVD writer's
jumper to Master and connect it to the secondary IDE port.
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