Dell Studio XPS 1640 1645 Slot Dual Layer DVD Writer WT987 0WT987General Features:Slot-loadingSATA interface150 MB/s data transfer rate8x maximum write speed (DVD±R)4x maximum write speed (DVD±R DL)8x maximum rewrite speed (DVD RW)6x maximum rewrite speed (DVD-RW)5x maximum write speed (DVD-RAM)8x maximum read speed (DVD single layer)6x maximum read speed (DVD double layer)24x maximum write speed (CD-R)24x maximum rewrite speed (CD-RW)24x maximum read speed (CD)