Overview:

On a debian system, using wodim to write ISO images to CD media, then verifying the burn using md5sum. A change in behavior was seen following an upgrade from a 2.6.26 to a 2.6.32 kernel. Under 2.6.26 both CD-R and CD-RW media burn cleanly. Under 2.6.32, CD-RW media burn correctly and CD-R media fail to burn correctly.

The CD/DVD drives on the system are  
  Vendor_info    : 'PIONEER '
  Identification : 'DVD-RW  DVR-112D'
  Revision       : '1.21'
and
  Vendor_info    : 'PLEXTOR '
  Identification : 'DVDR   PX-800A  '
  Revision       : '1.00'

It doesn't matter which drive is used for the CDR and which is used 
for the CDRW.



Steps to reproduce (A script used to gather data is attached):

Create an ISO image. 
Blank the CDRW medium using: 

 # wodim dev=$CDRWDEV gracetime=2 -v blank=fast

Burn the CDRW medium using:

 # wodim -v  dev=$CDRWDEV gracetime=2 fs=4096k \
          driveropts=burnfree padsize=63s \
          -useinfo -dao -pad  -data $ISO

Burn the CDR medium using:

 # wodim -v  dev=$CDRDEV gracetime=2 fs=4096k \
          driveropts=burnfree padsize=63s \
          -useinfo -dao -pad  -data $ISO

calculate md5sum of ISO:

 # dd if=$ISO bs=$blocksize count=$blockcount conv=notrunc,noerror | md5sum

calculate md5sum of CDRW:

 # dd if=$CDRWDEV bs=$blocksize count=$blockcount conv=notrunc,noerror | md5sum

calculate the md5sum of CDR:

 # dd if=$CDRDEV bs=$blocksize count=$blockcount conv=notrunc,noerror | md5sum

compare the results running under 2.6.26 and also under 2.6.32



Actual Results: 

Under 2.6.26 the md5sums of the CDR, CDRW and ISO are the same. Under 2.6.32 the md5sums for the ISO and the CDRW match. The md5sum for the CDR does not match. 



Expected result:

md5sums of all images should match on 2.6.32 as they do on 2.6.26.