Browse Prior Art Database

DIAGNOSITC READ SCHEME

IP.com Disclosure Number: IPCOM000024200D
Original Publication Date: 1979-Dec-31
Included in the Prior Art Database: 2004-Apr-02
Document File: 2 page(s) / 64K

Publishing Venue

Xerox Disclosure Journal

Abstract

A concept is disclosed for using a special track on the disk of a word processing system to perform diagnostic checkout of the word processing system. In the diagnositc mode, the diagnostic read capability helps to diagnose and isolate failures within the disk drive system as well as the disk controller interface. The concept is based upon a diagnostic RAM located on the disk controller module and a specially formatted diagnostic disk. The diagnostic RAM as well as the necessary front-end read decode logic will have been previously verified and may be used as a resource to validate the disk as a subsystem.

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(EROX DISCLOSURE JOURNAL

Block Final 0 Initial Block (1) Block Block (N+1) Postamble 'F Preamble Preamble I Data I Postamble (2) (N) c

DIAGNOSITC READ SCHEME Proposed Ronald 3. Quagliara Classification

U.S. Cl. 346/146 Int. C1. Gold 9/00

A concept is disclosed for using a special track on the disk of a word processing system to perform diagnostic checkout of the word processing system.

In the diagnositc mode, the diagnostic read capability helps to diagnose and isolate failures within the disk drive system as well as the disk controller interface. The concept is based upon a diagnostic RAM located on the disk controller module and a specially formatted diagnostic disk. The diagnostic RAM as well as the necessary front-end read decode logic will have been previously verified and may be used as a resource to validate the disk as a subsystem.

The recorded disk will have a format that is continuous in nature; there shall be no gap areas.

Each primitive tract will consist of the following:

0

0

Initial Preamble - 64 bytes from Index to Block 1. Preamble - Each block will have 10 bytes of preamble. Data Block - Each Data Block will have exactly 105 bytes.

0 Address Mark 1 byte

102 Data Bytes

e

Postamble - Each block will have 13 bytes of postamble. There may be a total of 38 Data Blocks.

Final Postamble - An undefined amount of postamble will be written from the last Data Block to the Index.

CRC check word 2 bytes

0

e

Volume 4 Number 6 November/December 1979 77 1

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