actually, wht happens is that when CD drive encounters CRC errors, it reverts back PIO mode.
a good option is to
uninstall the device , and then
install it again
but it'll turn to PIO again when it faces more CRC errors
Quote:
PIO mode is enabled by default in the following situations:
...
For repeated DMA errors. Windows XP will turn off DMA mode for a device after encountering certain errors during data transfer operations. If more that six DMA transfer timeouts occur, Windows will turn off DMA and use only PIO mode on that device.
In this case, the user cannot turn on DMA for this device. The only option for the user who wants to enable DMA mode is to uninstall and reinstall the device.
Windows XP downgrades the Ultra DMA transfer mode after receiving more than six CRC errors. Whenever possible, the operating system will step down one UDMA mode at a time (from UDMA mode 4 to UDMA mode 3, and so on).
...
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look at this page:
http://www.michna.com/kb/WxDMA.htm
and microsoft's page for this:
http://support.microsoft.com/kb/817472/
these pages have good info !
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alibi