Browse Prior Art Database

Phantom Tracks

IP.com Disclosure Number: IPCOM000078413D
Original Publication Date: 1972-Dec-01
Included in the Prior Art Database: 2005-Feb-25
Document File: 2 page(s) / 34K

Publishing Venue

IBM

Related People

McCain, WC: AUTHOR

Abstract

The figure shows the adaption of a direct-access data structure design for a specific device, to fit a similar device having a greater track capacity. The original data structure 10 is employed for the larger tracks 11-13, and the leftover space 14 on each new track is used as if it were a separate, additional "phantom" track. The allocation, randomizing and accessing of the phantom tracks may be treated independently of the remainder of the same physical tracks.

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Phantom Tracks

The figure shows the adaption of a direct-access data structure design for a specific device, to fit a similar device having a greater track capacity. The original data structure 10 is employed for the larger tracks 11-13, and the leftover space 14 on each new track is used as if it were a separate, additional "phantom" track. The allocation, randomizing and accessing of the phantom tracks may be treated independently of the remainder of the same physical tracks.

The data structure 14 need not resemble the data structure 10 on the same track, but may be identical to other parts of the original data structure or define a new data structure altogether. Furthermore, vertical track structures 15, 16 may be defined on the phantom tracks 14, which, form a data structure similar of identical to a horizontal track structure 10 on some of the original tracks.

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