The WD My Passport Essential 500 GB USB 3.0/2.0 Portable External HD in Pacific Blue is a compact and reliable external hard drive by Western Digital. With a storage capacity of 500 GB, this portable HDD is compatible with Mac computers and features a USB 3.0 interface for fast data transfer. The drive is powered by USB and has a form factor of 2.5 inches, making it easy to carry and use anywhere. The blue color adds a touch of style to this practical and efficient external hard drive.