track density
61RCA Photophone — was the trade name given to one of four major competing technologies that emerged in the American film industry in the late 1920s for synchronizing electrically recorded audio to a motion picture image. RCA Photophone was a variable area film… …
62cañada — /keuhn yah deuh, yad euh/, n. Chiefly Western U.S. 1. a dry riverbed. 2. a small, deep canyon. [1840 50; < Sp, equiv. to cañ(a) CANE + ada n. suffix] * * * Canada Introduction Canada Background: A land of vast distances and rich natural resources …
63Canada — /kan euh deuh/, n. a nation in N North America: a member of the Commonwealth of Nations. 29,123,194; 3,690,410 sq. mi. (9,558,160 sq. km). Cap.: Ottawa. * * * Canada Introduction Canada Background: A land of vast distances and rich natural… …
64mass transit — a system of large scale public transportation in a given metropolitan area, typically comprising buses, subways, and elevated trains. Cf. rapid transit. * * * Transportation systems, usually publicly but sometimes privately owned and operated,… …
65Manchester, New Hampshire — This article is about the city in New Hampshire. For other uses, see Manchester (disambiguation). Manchester, New Hampshire   City   View of downto …
66Group code recording — In computer science, group code recording (GCR) refers to several distinct but related encoding methods for magnetic media. The first, used in 6250 cpi magnetic tape, is an error correcting code combined with a run length limited encoding scheme …
67Operation Sandblast — Part of Cold War (1953–1962) …
68Disk storage — or disc storage is a general category of storage mechanisms, in which data are digitally recorded by various electronic, magnetic, optical, or mechanical methods on a surface layer deposited of one or more planar, round and rotating disks (or… …
69TRS-80 — For the Chicago based electronica group, see TRS 80 (group). TRS 80 Model I with Expansion Interface Release date August 3, 1977 (1977 08 03) …
70Optical disc — Optical media redirects here. For transmission media for light, see Medium (optics). The optical lens of a compact disc drive. In computing and optical disc recording technologies, an optical disc is a flat, usually circular disc which encodes… …
