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Browse Prior Art Database

Storage of Small Files into Zero File System Space

IP.com Disclosure Number: IPCOM000114353D
Original Publication Date: 1994-Dec-01
Included in the Prior Art Database: 2005-Mar-28
Document File: 2 page(s) / 25K

Publishing Venue

IBM

Related People

Christofferson, AH: AUTHOR [+3]

Abstract

Described is a method of storing small files on recordable media into previously allocated space which results in no additional media utilization for the file. Essentially, the data is stored in unused areas within fixed data structures such as directory or volume information and results in zero additional media space used for data.

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This is the abbreviated version, containing approximately 100% of the total text.

Storage of Small Files into Zero File System Space

      Described is a method of storing small files on recordable
media into previously allocated space which results in no additional
media utilization for the file.  Essentially, the data is stored in
unused areas within fixed data structures such as directory or volume
information and results in zero additional media space used for data.

      To use this method, the file data is placed in unused areas
within the directory structure with an indication in the directory
entry to signify the data as being "embedded" and not written in
separately allocated space.  For example, a directory entry might
include pointers to the next and previous entries (linked list), the
file name, file size, attributes of the file and pointer or status of
the data.  This very often uses a small portion of the minimum block
size on the physical media.  The data is stored in the remainder of
the block, effectively using zero space since the block is required
to store the directory entry.