burncd/atapi multisession CD issues

	I've got a couple of issues, which both appear on RELENG_6 and 
-CURRENT as of today.  I'm not sure when they started as I mostly 
burncd multisession backups on my 4.x system.
	Once I burn a CD with burncd:
mkisofs -r -J -o test.iso files
burncd -f /dev/acd0 -s max -m data test.iso fixate
The files burn just fine, but I have to eject and then close the 
drive. eg. "cdcontrol eject ;  cdcontrol close" before I can mount 
the CD.  If I try to mount the CD without the eject/close I get the 
following message in the syslog:
kernel: g_vfs_done():acd0[READ(offset=32768, length=2048)]error = 5
  The same goes (eject/close except no error message) before grabbing 
the multisession info with "burncd -f /dev/acd0 msinfo".
When I try to burn another session with burncd I just get 
"Input/Output error" and the second session doesn't get added to the 
CD.
This all seems like a problem with ata/atapi rather than burncd.

From the RELENG_6 system:
atapci0: <nVidia nForce3 Pro UDMA133 controller> port 
0x1f0-0x1f7,0x3f6,0x170-0x177,0x376,0xf900-0xf90f at device 8.0 on 
pci0
ata0: <ATA channel 0> on atapci0
ata1: <ATA channel 1> on atapci0
ad0: 38162MB <WDC WD400BB-23FJA0 13.03G13> at ata0-master UDMA100
ad1: 32253MB <HDS728080PLAT20 PF2OA21B> at ata0-slave UDMA133
acd0: CDRW <BENQ CDRW 5232X/KPEY> at ata1-master UDMA33

From the CURRENT system:
atapci0: <AcerLabs M5229 UDMA66 controller> port 
0x1f0-0x1f7,0x3f6,0x170-0x177,0x376,0x1400-0x140f at device 15.0 on 
pci0
atapci0: using PIO transfers above 137GB as workaround for 48bit DMA 
access bug, expect reduced performance
ata0: <ATA channel 0> on atapci0
ata1: <ATA channel 1> on atapci0
ad0: 19077MB <TOSHIBA MK2018GAP M1.42 A> at ata0-master UDMA66
acd0: CDRW <TOSHIBA DVD-ROM SD-R2212/1F15> at ata1-master UDMA33


Thanks,

-- 
Anish Mistry