MSD meaning in Computing ?

The Memory Stick is a removable flash memory card format, originally launched by Sony in late 1998. In addition to the original Memory Stick, this family includes the Memory Stick PRO, a revision that allows greater maximum storage capacity and faster file transfer speeds; Memory Stick Duo, a small-form-factor version of the Memory Stick (including the PRO Duo); the even smaller Memory Stick Micro (M2), and the Memory Stick PRO-HG, a high speed variant of the PRO to be used in high-definition video and still cameras.

As a proprietary format, Sony exclusively used Memory Stick on its products in the 2000s such as Cyber-shot digital cameras, Handycam digital camcorders, WEGA and Bravia TV sets, VAIO PCs, early Walkman digital audio players, and the PlayStation Portable handheld game console, with the format being licensed to a few other companies early in its lifetime. With increasing popularity of SD card, in 2010 Sony started to support the SD card format, which was seen as a Sony loss in the memory-card format war. Despite this, Sony continued to support Memory Stick on certain devices.