Here is an hdparm from an FC2 machine: hdparm /dev/cdrom /dev/cdrom: HDIO_GET_MULTCOUNT failed: Invalid argument IO_support = 1 (32-bit) unmaskirq = 1 (on) using_dma = 1 (on) keepsettings = 0 (off) readonly = 0 (off) readahead = 256 (on) HDIO_GETGEO failed: Invalid argument Is it optimized incorrectly ? It has dma and an unmaskedirq and 32 bit I/O. ????????????? On Thu, 2004-11-04 at 11:39 -0500, Alan Cox wrote: > On Thu, Nov 04, 2004 at 09:11:53AM -0700, Kim Lux wrote: > > That is exactly what I was looking for. Your drive isn't optimized. > > unmaskirq should be enabled and it should use 32 bit support, not 16. > > These are irrelevant for DMA mode, and DMA is on. It looks properly tuned to > me as far as this shows > -- Kim Lux (Mr.) Diesel Research Inc