Greystone Data Systems, Inc. purchases field return products and refurbishes them prior to resale. Services are authorized by major product manufacturers. Head Quarters are located in Fremont, CA and depot operations are located in Ho Chi Minh City, Vietnam. There are sales offices in Singapore, Japan, Australia, Taiwan and Ireland.

Key products are disk drives, lcd displays, user input and output devices, boards, notebook computers, network products, and cell phones. In addition to providing standard depot repair of computer and communications hardware, Greystone designs and manufactures test equipment, hard disk duplicators, and tools for depot repair processes.