Browse Prior Art Database

Logical SEEK-TO-CLOSE for Compact Disk-Recordable Media/Drives

IP.com Disclosure Number: IPCOM000118062D
Original Publication Date: 1996-Aug-01
Included in the Prior Art Database: 2005-Mar-31
Document File: 4 page(s) / 67K

Publishing Venue

IBM

Related People

Winarski, DJ: AUTHOR [+2]

Abstract

Currently, when a recording session on a CD-R(ecordable) disk is CLOSED, further recording on that CD-R media is forbidden. Thus, it is possible to inadvertently waste a lot of CD-R media.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 71% of the total text.

Logical SEEK-TO-CLOSE for Compact Disk-Recordable Media/Drives

      Currently, when a recording session on a CD-R(ecordable) disk
is CLOSED, further recording on that CD-R media is forbidden.  Thus,
it is possible to inadvertently waste a lot of CD-R media.

      The CLOSE of a piece of CD-R media should be written at the
physical end of the disk, which is currently at the outer diameter of
the disk.  This CLOSE would be part of a CD-R format process.

      At the end of each recording session, a logical SEEK-TO-CLOSE
block would be written at the end of the data stream.  The condition
associated with this SEEK-TO-CLOSE is that the drive would seek to
the CLOSE at the physical end of the disk only if there is not more
data following the logical SEEK-TO-CLOSE.  This is shown in the flow
charts.

      In Fig. 1, write process 100 begins where the last logical
SEEK-TO-CLOSE was written, step 101.  Data is written to the disk in
step 102.  If the write process is not finished in step 103, the
write process continues.  However, if the write process is finished
in step 103, then a logical SEEK-TO-CLOSE is written at the immediate
end of that write session, step 104.

      Note, this logical SEEK-TO-CLOSE does not follow every file
written.  It is written at the end of every write session.
Typically, many files are written in a CD-R session.

      In Fig. 2, the reading of data 200 starts with read step
201.  If a logical SEEK-TO-CLOSE is rea...