On Sat, Jun 04, 2005 at 03:47:42PM +0200, Hans Petter Selasky wrote: > Why is PIO mode not selected automatically by the ATAPI driver? Hence > obviously some manufacturers try to save money here, not supporting all modes > for all mediums? UDMA works for data CD-ROM's though.
(a) Because it adds a lot of overhead for normal operation e.g. playing a DVD. (b) Because not all drives are unable to correctly implement it, for many ATAPI-DMA and CDDA works fine. BTW, you can always switch without rebooting, atacontrol(8) is your friend. Joerg _______________________________________________ [email protected] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to "[EMAIL PROTECTED]"
