I have a system that is throwing tons of CRC error messages; keeps
downgrading the DMA mode. dmesg output is at the bottom of this message.

Any idea what could be going on here?

Louis


####################################
$ dmesg|grep "wd[01]"

wd0 at atabus2 drive 0: <Maxtor 4R060J0>
wd0: drive supports 16-sector PIO transfers, LBA addressing
wd0: 58644 MB, 119150 cyl, 16 head, 63 sec, 512 bytes/sect x 120103200
sectors
wd0: 32-bit data port
wd0: drive supports PIO mode 4, DMA mode 2, Ultra-DMA mode 6 (Ultra/133)


wd1 at atabus2 drive 1: <Maxtor 53073H4>
wd1: drive supports 16-sector PIO transfers, LBA addressing
wd1: 29311 MB, 59554 cyl, 16 head, 63 sec, 512 bytes/sect x 60030432 sectors
wd1: 32-bit data port
wd1: drive supports PIO mode 4, DMA mode 2, Ultra-DMA mode 5 (Ultra/100)


wd0(viaide0:0:0): using PIO mode 4, Ultra-DMA mode 6 (Ultra/133) (using DMA)
wd1(viaide0:0:1): using PIO mode 4, Ultra-DMA mode 5 (Ultra/100) (using DMA)

wd0: transfer error, downgrading to Ultra-DMA mode 5
wd0(viaide0:0:0): using PIO mode 4, Ultra-DMA mode 5 (Ultra/100) (using DMA)

wd1(viaide0:0:1): using PIO mode 4, Ultra-DMA mode 5 (Ultra/100) (using DMA)

wd0d: error reading fsbn 0 (wd0 bn 0; cn 0 tn 0 sn 0), retrying
wd0: (aborted command, interface CRC error)
wd0: transfer error, downgrading to Ultra-DMA mode 4
wd0(viaide0:0:0): using PIO mode 4, Ultra-DMA mode 4 (Ultra/66) (using DMA)

wd1(viaide0:0:1): using PIO mode 4, Ultra-DMA mode 5 (Ultra/100) (using DMA)

wd0d: error reading fsbn 0 (wd0 bn 0; cn 0 tn 0 sn 0), retrying
wd0: (aborted command, interface CRC error)
wd0: transfer error, downgrading to Ultra-DMA mode 3
wd0(viaide0:0:0): using PIO mode 4, Ultra-DMA mode 3 (using DMA)

wd1(viaide0:0:1): using PIO mode 4, Ultra-DMA mode 5 (Ultra/100) (using DMA)

wd0d: error reading fsbn 0 (wd0 bn 0; cn 0 tn 0 sn 0), retrying
wd0: (aborted command, interface CRC error)
wd0: soft error (corrected)

wd1: transfer error, downgrading to Ultra-DMA mode 4

wd0(viaide0:0:0): using PIO mode 4, Ultra-DMA mode 3 (using DMA)

wd1(viaide0:0:1): using PIO mode 4, Ultra-DMA mode 4 (Ultra/66) (using DMA)

wd1d: error reading fsbn 0 (wd1 bn 0; cn 0 tn 0 sn 0), retrying
wd1: (aborted command, interface CRC error)
wd1: soft error (corrected)

boot device: wd0
root on wd0a dumps on wd0b

wd0: transfer error, downgrading to Ultra-DMA mode 2
wd0(viaide0:0:0): using PIO mode 4, Ultra-DMA mode 2 (Ultra/33) (using DMA)

wd1(viaide0:0:1): using PIO mode 4, Ultra-DMA mode 4 (Ultra/66) (using DMA)

wd0a: error writing fsbn 16 of 16-19 (wd0 bn 79; cn 0 tn 1 sn 16), retrying
wd0: (aborted command, interface CRC error)
wd0: soft error (corrected)

wd1: transfer error, downgrading to Ultra-DMA mode 3

wd0(viaide0:0:0): using PIO mode 4, Ultra-DMA mode 2 (Ultra/33) (using DMA)

wd1(viaide0:0:1): using PIO mode 4, Ultra-DMA mode 3 (using DMA)
wd1b: error writing fsbn 16 of 16-19 (wd1 bn 761056; cn 755 tn 0 sn 16),
retrying
wd1: (aborted command, interface CRC error)
wd1: transfer error, downgrading to Ultra-DMA mode 2

wd0(viaide0:0:0): using PIO mode 4, Ultra-DMA mode 2 (Ultra/33) (using DMA)

wd1(viaide0:0:1): using PIO mode 4, Ultra-DMA mode 2 (Ultra/33) (using DMA)
wd1b: error writing fsbn 16 of 16-19 (wd1 bn 761056; cn 755 tn 0 sn 16),
retrying
wd1: (aborted command, interface CRC error)
wd1: soft error (corrected)
#############################################