DFI CA331-NR - Manual (Page 49)

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2
Hardware Installation
Important:
If you encountered problems while using an ATAPI CD-ROM drive that is
set in Master mode, please set the CD-ROM drive to Slave mode. Some
ATAPI CD-ROMs may not be recognized and cannot be used if incorrectly
set in Master mode.
BIOS Setting
Configure the onboard IDE in the Advanced menu of the BIOS. Refer to chapter 3
for more information.