G - Physics – 11 – B
Patent
G - Physics
11
B
352/21.3
G11B 5/55 (2006.01) G06F 12/06 (2006.01) G11B 5/82 (2006.01)
Patent
CA 1205193
Abstract In a disk type mass storage facility for data processing systems, a disk format which reduces access time and is compatable with an improved method of handling defective segments of medium. The format has three layers. A first, physical layer comprises the bytes, sectors and collections of sectors, as well as error detection and correction codes. A second, logical layer is used to address the physical layer and to collect together sectors to form a multiplicity of separately addressable spaces, with each space having a distinct functional utility. At a third, functional layer the use of data fields in each space is specified. This layer governs the handling of bad blocks if required, and the use of certain format information. At the physical layer, bits are collected into sectors, sectors are collected into tracks, tracks are collected into groups, and groups are collected into cylinders. These are logically, rather than physically, defined collections. A group is set of tracks wherein individual tracks in a group can be selected in the inter-sector rotation time. At the logical layer, the disk is divided into three main areas, each separately addressable. Minimization of access time latencies is obtained by proper selection of logical addressing - i.e., by selecting the number of sectors/track, tracks/group and group/cylinder-to take advantage of access characteristics. Various drive parameters are stored in the disk and are supplied to its controller on command, permitting the controller to adapt thereto. These include the starting address for each of the various areas, or spaces, of the disk, and for example, its transfer rate, logical addressing structure, etc.
475223
Gardner Edward A.
Lary Richard F.
Parenti Mark A.
Rubinson Barry L.
Digital Equipment Corporation
Smart & Biggar
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