Sonic Solutions

Sun Microsystems, Inc.

Roxio, Inc.

Wayne Ihde

William Lee Duncan

Michael Tibbetts

Michael Scott McMurdie

Robert Scott Tracy

Provided are a method, system, and an article of manufacture for detecting errors while accessing a storage device. A host system writes an identical initialization pattern into each block of a plurality of blocks while formatting the storage device. Each block of the plurality of blocks has a checksum field capable of containing a value. Any host system generates an error when data from a retrieved block from the plurality of blocks computes to a checksum that is different from the value contained within the checksum field for the retrieved block, and the retrieved block does not contain the initialization pattern.

Storage device with SCSI formatting

A method for verifying sectors on an optical disc is provided. The method includes writing user data to unverified sectors of the optical disc and verifying the sectors of the optical disc with the user data. The sectors of the optical disc are verified by reading the user data on the unverified sectors of the optical disc and comparing the user data read from the unverified sectors of the optical disc with user data stored on a system buffer. The sectors of the optical disc are verified to determine whether any one of the unverified sectors having user data is defective. Also, the verifying of the unverified sectors establishes verified sectors having user data. The sectors of the optical disc that have been verified are tracked with a bitmap that is continually updated as the sectors are verified.

Methods for optical disc sector verification

Error detection in storage data

A method for writing a file of data to a compact disc media is provided. The method begins by receiving a first portion of the file for writing to the compact disc media. The first portion can be any portion of the file. Once received, the first portion is divided into a plurality of chunks. A map data sector is then generated for a set of the plurality of chunks, and the map data sector includes information for interrelating the file data and the plurality of chunks to be written to the compact disc media. The map data sector is then written to the compact disc media followed by the plurality of chunks of the first portion of the file. If possible, the plurality of chunks are first compressed before writing to the compact disc media. If the first portion is long enough to fill multiple sets of chunks, associated map data sectors will be generated for those additional sets of chunks. Reading of a file written to the compact disc media will include reading the map data for the file, decompressing the file if needed and then arranging the chunks of data in accordance with information provided by the map data. The file is then transferred to the requesting application in the arranged file order.

Method for writing and reading data to and from a compact disc media

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Boulder, CO, United States of America

Wayne Ihde