IBM 71P7279 User Manual page 100

5. Click the IDE ATA/ATAPI controller to open the tree.
6. Double-click the device that corresponds to the port of your CD-ROM. It
will either be Primary IDE or Secondary IDE.
7. Click the Advanced Settings tab.
8. Select the Transfer Mode pull-down and select DMA if available.
9. Click OK.
10. Click Close to close the System Properties window. A message displays,
informing you that the system settings have changed.
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48X-20X Internal IDE CD-ROM Drive: User's Guide