Answer:It might be that the CDROM is transferring in PIO mode instead of DMA mode. It is highly recommended to enable the DMA function of your IDE optical devices (CD-ROM or DVD-ROM) in order to reduce the CPU loading when accessing optical discs. Please follow the bellow procedure to enable DMA mode.
In Windows 2000/XP, assuming that your IDE optical device is connected on secondary IDE channel as master drive,
- Right click the "My computer" icon, select "Properties". Then, select "Hardware"----"Device Manager".
- In "Device Manager", select "IDE ATA/ATAPI controllers"----double click "Secondary IDE Channel".
- In "Secondary IDE Channel Properties", select "Advance Settings" and adjust the "Transfer Mode" of the CDROM (Device 0) from "PIO Only" to "DMA if available".
- Click "OK".
In Windows 98SE/ME,
- Right click the "My computer" icon, select "Properties". Then, select "Device Manager".
- In "Device Manager", double click "CDROM". Then, double click your optical device under "CDROM".
- In the new window which displays the optical device properties, select "Settings". Then, check the "DMA" box in "Options".
- Click "OK".
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