Main Page | See live article | Alphabetical index A hard disk platter is a component of a hard disk drive, which may have one or more hard disk platters. Typically made from metal or plastic, a hard disk platter is a rigid, circular disk. A thin layer of either iron oxide or another material that possesses magnetic properties coats each side of a hard disk platter. This article is from Wikipedia. All text is available under the terms of the GNU Free Documentation License.