Designed for power users and professionals, the EB2 provides a versatile combination of 1394b FireWire 800, 1394a FireWire 400, eSata, and USB - all in one small drive! The drive is equipped with the industry's best Oxford 924 chipset, which is approved by Apple/Avid and many other hardware and software manufacturers. No external power supply is necessary, as this drive will power from the FireWire 800 or 400 bus. For eSATA and USB connections, the DC Jack to USB-Y cable supplies bus power by connecting to two USB ports for power. As an alternative, the drive can use the included power adapter. The patented secure fixing mechanism and anti-shock damper strip maintain drive stability and help prevent damage due to impact, drops, and excessive movement. Finally, the HDD spin-down feature ensures efficient operation by reducing power consumption. When your computer enters sleep mode, the hard drive spins down to minimize power consumption. The hard drive spins up automatically when the host system wakes up.