Browse Prior Art Database

Extension for Coded Interblock Gaps in Tape Storage Systems

IP.com Disclosure Number: IPCOM000041411D
Original Publication Date: 1984-Jan-01
Included in the Prior Art Database: 2005-Feb-02
Document File: 2 page(s) / 25K

Publishing Venue

IBM

Related People

Lockett, DE: AUTHOR

Abstract

In a tape storage system, it is suggested that the tape format utilize a relatively large interblock gap (IBG) by combining the coded pattern which forms the IBG with the coded pattern for an erased area (ERG), inserted as "filler". Since the read system has the capability to handle this same format, which occurs when a defect must be skipped or erased during a write operation, minimum impact on the design occurs to handle a large IBG, desired for low end products. The erase coded area may also be made variable to allow other entries in a product menu to use the IBG size, which is necessary to contain the start/stop distances required of various tape speeds and acceleration rates. This type of extended IBG coded format is also desirable to bracket the void created when writing in the start/stop mode.

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Extension for Coded Interblock Gaps in Tape Storage Systems

In a tape storage system, it is suggested that the tape format utilize a relatively large interblock gap (IBG) by combining the coded pattern which forms the IBG with the coded pattern for an erased area (ERG), inserted as "filler". Since the read system has the capability to handle this same format, which occurs when a defect must be skipped or erased during a write operation, minimum impact on the design occurs to handle a large IBG, desired for low end products. The erase coded area may also be made variable to allow other entries in a product menu to use the IBG size, which is necessary to contain the start/stop distances required of various tape speeds and acceleration rates. This type of extended IBG coded format is also desirable to bracket the void created when writing in the start/stop mode. As the tape is stopped after writing a block of data, the writing process ceases and the coded IBG pattern will not be recorded on the medium. When starting again for the next data block to be written, without repositioning the medium, the IBG pattern again cannot be recorded until the tape is up to speed. Therefore, the coded extended IBG described allows start/stop mode write operations without repositioning (this ability to handle tape operations without repositioning time loss being an objective of start/ stop mode), and provides a format which is variable and acceptable to systems capable of smaller IBG...