8X DVD-ROM / 24X CD-ROM / 24X CD-R /16X CD-RW - Portable ultra slim design - Compliant with USB 2.0 High-Speed (480Mbps) Spec - Bootable on most PCs/Laptops - Memory buffer size: 2MB - Best speed when powered by an additional USB power cable (requires one more USB port available) - Can be powerless (only connected by the USB data cable) but will result in lower speed - Plug & Play and hot pluggable no drivers required for Windows ME/2000/XP/Server 2003/Vista/Server 2008/Linux (needs driver under Windows 98/SE) - Package list: external drive & enclosure USB data cable USB power cable driver CD English user's manual