READ_BIG UDMA ICRC error

Hi all,

After moving from -stable to -current, I am unable to mount cdroms in DMA 
mode, but they will mount in PIO.  I found a thread regarding something like 
this from January 2004, near 5.2-release, but no apparent resolution.  It was 
working fine in -stable.

In DMA mode, I get 
# mount_cd9660 /dev/acd0 /cdrom
mount_cd9660: /dev/acd0: Invalid argument

#dmesg | grep acd0  
acd0: CDRW <SONY CD-RW/DVD-ROM CRX830E/KDK3> at ata1-master UDMA33
acd0: FAILURE - TEST_UNIT_READY ABORTED COMMAND asc=0x4e ascq=0x00 
error=4<ABORTED>
acd0: WARNING - READ_BIG UDMA ICRC error (retrying request)
acd0: FAILURE - TEST_UNIT_READY ABORTED COMMAND asc=0x4e ascq=0x00 
error=4<ABORTED>
acd0: FAILURE - TEST_UNIT_READY ABORTED COMMAND asc=0x4e ascq=0x00 
error=4<ABORTED>
acd0: FAILURE - TEST_UNIT_READY ABORTED COMMAND asc=0x4e ascq=0x00 
error=4<ABORTED>
acd0: WARNING - READ_BIG UDMA ICRC error (retrying request)
acd0: FAILURE - TEST_UNIT_READY ABORTED COMMAND asc=0x4e ascq=0x00 
error=4<ABORTED>
acd0: FAILURE - TEST_UNIT_READY ABORTED COMMAND asc=0x4e ascq=0x00 
error=4<ABORTED>

#uname -a
FreeBSD  6.0-CURRENT FreeBSD 6.0-CURRENT #1: Mon May  9 23:52:01 UTC 2005     
ringo_at_:/usr/obj/usr/src/sys/CCUSTOM  i386

Any help appreciated.