acd0: MODE_SENSE_BIG command timeout - resetting

Tue Jun 29 06:31:06 PDT 2004

done
acd0: MODE_SENSE_BIG command timeout - resetting
ata0: resetting devices .. ad0: DMA limited to UDMA33, not-ATA66 cable 
or device

done
acd0: read data overrun 34/0
acd0: MODE_SENSE_BIG command timeout - resetting
ata0: resetting devices .. ad0: DMA limited to UDMA33, not-ATA66 cable 
or device

done
acd0: DVD-ROM <DVD-ROM DDu1621> at ata0-slave PIO4
I installed DF on an old 20gb HD which is on the same cable as the 
DVD-ROM. Every other reboot, consistently, DF gives a series of these 
messages and then hangs. Power off/on again and DF boots without complaint.