cdrecord (schilling's) and wodim : Warning: Cannot read drive buffer.

[jd1008]

How do I fix this?
The drive is:
$ dmesg | egrep -i 'cdrom|dvd|optical|optiarc'
[    1.614989] ata2.00: ATAPI: Optiarc DVD+/-RW AD-7930H, 100A, max UDMA/100
[    1.637908] scsi 1:0:0:0: CD-ROM            Optiarc  DVD+-RW AD-7930H 
100A PQ: 0 ANSI: 5
[    1.669987] sr 1:0:0:0: [sr0] scsi3-mmc drive: 62x/62x writer dvd-ram 
cd/rw xa/form2 cdda tray
[    1.670229] cdrom: Uniform CD-ROM driver Revision: 3.20

Thanx!