Sony 8X External Slim DVD+/-RW Drive DRX-S77U/W (White) Drive Type: External DVDRW Dual Layer Slim Drive Interface: USB2.0 Burst Transfer Rate: 480 Mbit/s Buffer Memory: 2 MB Random Access Time: DVD - 180ms; CD - 150ms Data Transfer Rate: Write: DVD+R/-R: 8X DVD+RW/-RW: 8X/6X DVD+R/-R DL: 6X DVD-RAM: 5X CD-R: 24X CD-RW: 24X Read: DVD+R/-R: 8X DVD+R/-R DL: 6X DVD+RW/-RW: 8X DVD-ROM (Single/Dual): 8X DVD-RAM: 5x CD-ROM: 24X CD-R: 24X CD-RW: 24X Format Support: Modes supported: DVD-ROM, DVD-Video, CD-ROM, CD-ROM XA, CD-I Ready, CD-Bridge, PhotoCD, VideoCD, CD-DA, CD Extra, CD Text Media supported: DVD+/-RW, DVD+/-R, DVD+R/-R DL, DVD-ROM, DVD-RAM, CD-ROM, CD-R, CD-RW with 80mm and 120mm diameter