The 3TB LaCie D2 TBT U3 is a portable external hard drive designed for use with laptops, PCs, and Macs. It features a sleek silver color and a compact 3.5-inch form factor. With a rotation speed of 7200 RPM and a Thunderbolt interface, this HDD drive offers fast data transfer speeds. The LaCie brand ensures reliability and quality, making it a great choice for those in need of extra storage capacity on the go.