http://wwwbsc.pioneer.co.jp/product....html#firmware1

change log fw 1.23

Support New 8x DVD-R DL Media
( 8x writing:MKM )
Support New 8x +RW Media
( 3.3x writing:RITEK )
CD-R Writability has improved.
CD-RW Writability has improved.
DVD Readability has improved
CD Readability has improved
Support reading on 16x DVD-RAM Media (RAM2 Media)