Lenovo ThinkPad UltraSlim USB DVD Burner

This portable external DVD burner works alongside modern ultrabooks, notebook computers, as well as media players. Compared to the previous model, this DVD burner is 20% thinner and exclusively designed in the spirit of the ThinkPad series. It doesn't require a power adapter and is sufficiently powered through a pair of USB ports, making it the ideal portable device. It is compatible with all available CD and DVD formats and is equipped with a memory buffer for reliable writing. 
Specifications:

Access time:
DVD-ROM 160ms (1/3 stroke)
CD-ROM 140ms

Write speed:
DVD-R2X CLV, PCAV 4x, 8x CAV DVD-R DL2x CLV, PCAV 4x, 6x DVD-PCAV RW2x CLV, 4x, 6x DVD-ZCLV RAM2x, CLV 3x, 5x PCAV (Ver.2.2) (12x Media: Not support ) M-DISC (DVD+R SL) 4x DVD + PCAV R2.4x CLV, PCAV 4x, 8x CAV DVD + R DL2.4x CLV, PCAV 4x, 6x DVD + PCAV RW2.4x CLV, ZCLV 4x, 8x ZCLV (8x disc Speed: 3.3x CLV, ZCLV 6x, 8x ZCLV) CD-R10x CLV, PCAV 16x, 24x CAVCD-RW4x, CLV 10x, 16x ZCLV, 24x ZCLV (High Speed: 10x CLV, Ultra Speed: 24x ZCLV, Ultra Speed plus: 24x ZCLV)

Read speed:
DVD-R/RW/ROM8x/8x/8x max. DVD-R DL8x max.DVD-RAM (Ver.2.2) 5x max. DVD-Video (CSS Compliant Disc) 4x max. (Single/Dual Layer) M-DISC (DVD + R SL) 8x CAV DVD+R/+RW8x/8xmax.DVD+R DL8xmax. CD-R/RW/ROM24x/24x/24x max. CD-DA (DAE) 24x max

Sustained transfer rate:
DVD-ROM 11.08Mb/s (8x) max.
CD-ROM 3,600kB/s (24x) max.