My Book is a series of external hard drives produced by Western Digital. There are at least nine series of My Book drives: Essential Edition, Home Edition, Office Edition, Mirror Edition, Studio Edition, Premium Edition, Elite Edition, Pro Edition, AV DVR "Live Edition", and the World Edition.

My Book drives are designed to look like a standard black hardback book, with the exception of the Pro/Studio series, which are silver, and the World series, which are white. Other than the book-like appearance of the drive's case, My Book drives originally featured vent holes on the top of the drives which spelled out a message in Morse code.

Essential Edition My Book drives are almost entirely black, with the exception of a single blue light, used to indicate power and activity, or a circular green light that is located on the front of the drive. The older^{[clarification needed]} model has a white light.

"Essential Edition" drives used USB 2.0 for connectivity are available in capacities of 80 GB, 160 GB, 250 GB, 320 GB, 400 GB, 500 GB and 750 GB.

Premium Edition My Book drives have the same black case as Essential Edition drives; however, the light surrounding the power button is blue. Also, inside the standard blue light is another blue ring light that contains eight individual segments which indicate the remaining space on the drive. This edition is available with storage capacities of 160 GB, 250 GB, 320 GB, 400 GB, and 750 GB.

Pro Edition My Book drives have the same basic case design as Premium Edition drives; however, the case is silver rather than black. In addition, it includes a circular blue capacity gauge LED divided into six segments (representing 17% of usage per segment) and an outer ring that represents drive activity.

This edition was available with storage capacities of 500 GB, 640 GB, 1 TB, 1.5 TB, and 2 TB.

This edition is black and was available with storage capacities of 500 GB, 640 GB, 1 TB, 1.5 TB, and 2 TB.