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Browse Prior Art Database

Logical Addressing Scheme for Better Reliability of Load/Unload Files

IP.com Disclosure Number: IPCOM000114401D
Original Publication Date: 1994-Dec-01
Included in the Prior Art Database: 2005-Mar-28
Document File: 2 page(s) / 30K

Publishing Venue

IBM

Related People

Boigenzahn, JF: AUTHOR [+2]

Abstract

A logical addressing scheme that increases file reliability for a disk file using dynamic load/unload is disclosed. The logical addressing scheme minimizes the use of the data zone that is used for loading and unloading the data heads.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 100% of the total text.

Logical Addressing Scheme for Better Reliability of Load/Unload Files

      A logical addressing scheme that increases file reliability for
a disk file using dynamic load/unload is disclosed.  The logical
addressing scheme minimizes the use of the data zone that is used for
loading and unloading the data heads.

      Most systems which use disk drives start at a logical block
address of 1 and start filling the disk drive from that point.
Addressing the loading zone as the very last logical block addresses
in the drive will limit the use of that area of the file and reduce
the user's exposure to data loss if damage were to occur in the
loading zone.  User's that did not use the drive enough to reach the
last logical block addresses would be protected from data loss due to
dynamic load/unload.

      A more effective scheme is to dynamically reallocate logical
block addresses to minimize the use of the loading zone area.  When
the loading zone logical block addresses are accessed, the file
determines if any lower addresses are unused (i.e., previously
erased) and, if they are unused, places the data in them rather than
the loading zone.  This further limits the use of the loading zone
until the drive is almost completely full, providing added
reliability to those users who don't completely fill the disk drive.