Model name: HL-GS31N. Type: Internal. Interface: SATA. Dimensions: 128.0(W)mm x 9.5(H)mm x 127.0(D)mm. Can replace: AD-5960S, AD-5970H,UJ868A,UJ898A,GS21N,GS22N,GS23N Writing speeds: CD-R: 10x CLV, 16x CAV, 24x CAV. CD-RW: Multi Speed:4x CLV. DVD+R: 2.4x CLV, 4x ZCLV, 8x CAV. DVD-R: 2x CLV, 4x ZCLV, 8x CAV. DVD+R Double Layer: 2.4x CLV, 4x ZCLV. DVD-R Double Layer: 2x CLV, 4x ZCLV. DVD+RW: 2.4x CLV, 3.3x ZCLV, 4x ZCLV. DVD-RW: 2x CLV, 4x ZCLV. Reading speeds: CD-ROM: 24X CAV. DVD-ROM: 8x CAV.DVD-ROM Dual Layer: 6x CAV. DVD+R: 8x CAV. DVD+R Double Layer: 6x CAV. DVD+RW: 6x CAV. DVD-R: 8x CAV. DVD-R Double Layer: 6x CAV. DVD-RW: 6x CAV. DVD-Video (CSS title): 4x CAV. >