Mac Time Machine Ready Portable Hard Drive with FireWire-800 and USB Interfaces - 2 TB Metal Enclosure - My Passport Studio - WDBU4M0020BBK-BESN Mac OS X 10.5 and later and Apple Time Machine compatible. It can be reformatted for Windows. WD Security- WD Security allows you to set password protection and hardware encryption for your drive to protect your files from unauthorized use or access Dimensions: L x W x H: 5.3 x 3.3 x 0.7 inch || Weight:0.56 lb Package Contents: Portable drive, Firewire IEEE1394b and USB cables. Optional software loaded. COMES IN AN ECONOMIC BROWN BOX - ZERO POWER-ON HOUR DRIVE. || 1 year seller limited warranty.