PIONEER DVR-S706 External 8x DVD & CD Writer - USB 2.0 / Firewire Quiet Drive Technology - reduces the drive's noise level by up to 15dB (75%) Liquid Crystal Control System - increases recording precision on media that may be warped or of uneven thickness Smart Laser Driver - provides precise laser pulse control for achieving more reliable recording at high speeds Precision Recording Technology - achieves optimal writing performance & helps minimize the normal deterioration of re-recordable media. Increasing the quality of repeatedly used DVD-RW discs by up to 10 times! Defect Management System - enhances writing reliability further, while maintaining read compatibility with other DVD-ROM drives, DVD players & recorders