Browse Prior Art Database

Adaptive media sense method for CD/DVD drive

IP.com Disclosure Number: IPCOM000014612D
Original Publication Date: 2000-Sep-01
Included in the Prior Art Database: 2003-Jun-20
Document File: 2 page(s) / 59K

Publishing Venue

IBM

Abstract

Disclosed is a method of controlling CD/DVD-ROM drives for achieving shorter time to beco In a conventional method of disk type detection, the search for a disk type would follow a set and fixed in the drive's microcode. DISK LO A D READ MDVD-RODVD-RO M ?

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Adaptive media sense method for CD/DVD drive

Disclosed is a method of controlling CD/DVD-ROM drives for achieving shorter time to beco

In a conventional method of disk type detection, the search for a disk type would follow a
set and fixed in the drive's microcode.

DISK LO A D

READ MDVD-RODVD-RO M ?

RO UTINE

READ DVD-RWDVD-RW ?

RO UTINE

The CD/DVD-ROM drive will need to go through many steps of "IF ... THEN DO ... ", and "EL
has been loaded. This will also involve mechanical and electrical switching such as selec
setting appropriate RF amplitude value, reading the logical format of the disk, and so on.

There are many types of CD and DVD disks available today. Such physically compatible optic
DVD-R, DVD-RW, DVD+RW, DVD-RAM, CD-R, CD-RW, CD-ROM, and CD Audio. Different types of form

If the target disk type was at the very end of the detection sequence, all this subroutine
and result in taking longer time for a drive to become ready when a disk is loaded.

This is inconvenient for a user if he/she was a frequent user of this type of disk.

The disclosed method will record the history of the type of disk loaded and the number of
loaded most recently. The drive will store this information in it's EEPROM.

Below is an example of the history.
When the user loaded CD-RW disk 23 times, CD-R for 10 times, CD-ROM for 5 times, CD Audio
loaded was a CD-ROM, the table will look like this.

History of disk type
mounted

Most recent disk type

DVD-ROM 1 0
DVD-RW 0 0
DVD-R 0 0
DVD+RW 0 0
DVD-RAM 0...