Compliant with USB 2.0 & USB 1.1. Drive Support: 3.5", 5.25" & 2.5" EIDE drives. Connectors: USB A port to IDE 40-pin female for 3.5" ide hard drive or 5.25" ide drivese (xternal power is required). 44-pin female for 2.5" Laptop Drives (powers the drive from the USB port, no additional external power is required). Supports various kinds of ATA /ATAPI based mass storage device port. USB 2.0 High Speed (480Mbit) and Full speed (12Mbit). Support Self-Power modes for 2.5" hard drives. Consume low electricity. Supports USB Suspend/Resume Wake-up ability. Supports plug & play specification. 64/512 bytes Data Payload for full high speed Bulk. USB 2.0 high-speed storage class applications such as Hard Disk, CD-ROM, CD-R / RW, DVD-R/RW, and DVD-Rom. Support IDE hard drive up to 320GB. System and other requirements. PC Users: Minimum 64 MB RAM. Minimum 233 MHz processor. Windows 98SE/ME/2000/XP. CD-ROM drive. Available USB 2.0/1.1. Macintosh Users: Minimum 64 MB RAM Mac OS 8.6 or higher CD-ROM drive Available USB 2.0/1.1 Package includes: USB 2.0 to IDE drive Adaptor. Cable Adapter Only. Without AC power adapter and without power cord.