Lenovo ThinkPad T420 دی وی دی رایتر لپ تاپ لنوو قطعات لپ تاپ  Lenovo Thinkpad T420 T510 W520 W510 T510i T520 R400 8X DVD RW RAM Double Layer DL Writer 24X CD Burner Optical Drive 12.7mm TECHNICAL SPECIFICATIONS TYPE Super-Multi Notebook DVD Rewriter TRANSFER RATES–WRITE DVD-R 8x DVD-R DL 8x DVD-RW 8x DVD-RAM 8x DVD+R 8x DVD+R DL 8x DVD+RW 8x CD-R 24x CD-RW 24x TRANSFER RATES - READ DVD-R/RW/ROM 8x/8x/8x max. DVD-R DL 8x max. DVD-RAM (Ver.1.0/2.2) 8x DVD-Video (CSS Compliant Disc)8x max (Single/Dual layer) DVD+R/+RW 8x/8x max. DVD+R DL 8x max CD-R/RW/ROM 24x/24x/24x max. CD-DA (DAE) 24x max. ACCESS TIME CD-ROM 140 ms typ. DVD-ROM 160 ms typ. DVD-RAM (Ver. 2.2) 260 ms typ. SUSTAINED TRANSFER RATE CD-ROM 3,600 kB/s (24x) max. DVD-ROM 11.08 Mbytes/s (8x) max. BUFFER SIZE 1 MB Buffer Under-run prevention function embedded HOST INTERFACE Serial ATA OPERATING SYSTEMS Windows 7, Windows Vista™, Windows XP WEIGHT 0.4 lbs 162g