mike polniak wrote: > I just got a new Maxtor HD to go along with my IBM hd. With Kernel > 2.4.3 and using >hdparm -d 1 to set DMA on, i get disk reads of 30MB/sec > on the IBM. The Maxtor DiaMax UDMA (ATA 100) yields only 3 MB/sec. > The IBM is auto detected at UDMA mode4. With the Maxtor i have to > run >hdparm -X68 -d 1 to set the xfermode to UDMA mode4.But obviously > it doesn't work (the drive info still says maxDMA=0(slow)). > > If i use Kernel 2.2.18pre21 the -X68 option of hdparm successfully > enables the Maxtor to transfer at UDMA mode4 (about 33 MB/sec) > even though the drive info still reports maxDMA=0(slow). > > Any thoughts on getting the Maxtor to be enabled with Kernel-2.4.3. > Is this a known issue with DMA that will change in later kernels? > Or should i just replace the Maxtor with another IBM? > >
Make sure that you have thre proper IDE chipset support compiled into your kernel. You could also try the ide0=ata100 flag at boot time to force ata100 transfer mode.
