It seems Kris Kennaway wrote:
> One of my Western Digital Caviars doesn't work under the new ATA driver:
> upon trying to access the disk (via swapon or mount during boot) it gives
> the famous "lost contact with disk" message and falls back to PIO mode.
> Interestingly, my two older WDCs work fine - although I notice that ad1
> and ad2 are only detected as WDMA2, when it seems (from the udma=2) that
> they can handle UDMA - is this a cabling issue or something (I'm not
> familiar with IDE cabling requirements)?
The disk probably has problems with DMA mode (lots of older WD disks
has that). You only get WDMA2 mode since you controller is an older
Intel PIIX that can't do UDMA...
> ata-pci0: <Intel PIIX ATA controller> at device 7.1 on pci0
> ata-pci0: Busmastering DMA supported
> ad0: piomode=4 dmamode=2 udmamode=-1 cblid=0
> ad0: <WDC AC31600H/21.15T21> ATA-0 disk at ata0 as master
> ad0: 1549MB (3173184 sectors), 3148 cyls, 16 heads, 63 S/T, 512 B/S
> ad0: 16 secs/int, 1 depth queue, WDMA2
> ad1: piomode=4 dmamode=2 udmamode=2 cblid=0
> ad1: <WDC AC22500L/32.41N37> ATA-3 disk at ata0 as slave
> ad1: 2441MB (4999680 sectors), 4960 cyls, 16 heads, 63 S/T, 512 B/S
> ad1: 16 secs/int, 1 depth queue, WDMA2
> ad2: piomode=4 dmamode=2 udmamode=2 cblid=0
> ad2: <WDC AC26400R/15.01J55> ATA-4 disk at ata1 as master
> ad2: 6149MB (12594960 sectors), 13328 cyls, 15 heads, 63 S/T, 512 B/S
> ad2: 16 secs/int, 1 depth queue, WDMA2
-Søren
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