Get CD info 

export CDR_DEVICE=ATA:0,0,0
export CDR_DEVICE=ATA:1,0,0
export CDR_DEVICE=ATA:1,1,0
export CDR_DEVICE=0,0,0
export CDR_DEVICE=ATAPI:0,0,0
export CDR_DEVICE=ATAPI:0,1,0
CDR_SPEED=8
CDR_SPEED=12
CDR_SPEED=16
export CDR_SPEED=20

NB, the env var CDR_DEVICE & CDR_SPEED can only be recognized by cdrecord.

about CD disks 

cdrecord -toc

-toc Retrieve and print out the table of content or PMA of a CD.

cdrecord -msinfo

-msinfo Retrieve multi session info

cdrecord -atip

-atip Retrieve and print out the ATIP (absolute Time in Pregroove) info

Empty CDRW 

cdrecord blank=fast