NOTE: This is an update and there are changes in the procedures!
This post explains how to treat books that are accompanied with cd-roms or other optical discs.

When you catalog a book that is accompanied with one or more CD-ROMs, audio discs, or other types of optical discs such as DVDs:

1. In the bibliographic record, use the “e” subfield to describe the accompanying materials in the 300 field. Example:
   • 300 …… + $e 1CD-ROM (4 3/4 in.)
   • 300 …… + $e 3 sound discs (in case)
   • 300 …… + $e 2 DVDs
2. If in a multi volume set, only one volume has CD-ROM, you can add a local note.
   Example: 590 v.5 accompanied by DVD.
3. Add a regular item record for the book.
4. Add an item record for the accompanying CD-ROM, and enter a volume identifier “cdrom” in the volume field. (The old practice was to use v.2cdrom, but this has become obsolete!) If there are two CD-ROMs, make two item records for each and use “cdrom1″ and “cdrom2″ respectively.
5. In the item record for the CD-ROM, code the IMESSAGE field with “c” (= check for CD [used for CDs and DVDs]).

For guidelines on Volume Identifiers, click on here.

Examples
┌西部民歌地图 : 草根阶层的欢乐与悲哭
└Xi bu min ge di tu : cao gen jie cen de huan le yu bei ku
M1804.F46 X5 2007
OCLC#191824917 Bib#62760130

┌KBS 아나운서 와 함께 하는 한국어 표준 발음 바르게 읽기
└KBS anaunsŏ wa hamkke paeunŭn Hanʼgugŏ pʻyojun parŭm parŭge ilki
PL908.8 K37 2008
OCLC#401722407 Bib#6344575x

How to set the 949 fields
The following are ways to set the 949 fields on Connexion for accompanying CD-ROMs

Case 1: A book accompanied with 1 CD-ROM
949_1 $g 1 $i 32435071413926 $j 0 $l buss $s p $t 0 $x – [item for the book itself]
949_1 $c cdrom $g 1 $i 32435071413926 $j 0 $l buss $s p $t 5 $x – [item for the CD]

Case 2: A book accompanied with 2 CD-ROMs
949_1 $g 1 $i 32435071413928 $j 0 $l buss $s p $t 0 $x – [item for the book]
949_1 $c cdrom1 $g 1 $i 32435071413929 $j 0 $l buss $s p $t 5 $x – [item for 1st CD]
949_1 $c cdrom2 $g 1 $i 32435071413930 $j 0 $l buss $s p $t 5 $x – [item for 2nd CD]

Case 3: A Korean language learning book accompanied with 3 sound/audio discs in one case.
300 143 p. ; ǂc 23 cm. + ǂe 3 sound discs (in case)
948 .b6344575x
949 0ǂl mai ǂm a ǂx – ǂd 06-15-09
949 1ǂg 1 ǂi 32435065629354 ǂj 0 ǂl maise ǂs p ǂt 0 ǂx -
949 1ǂc cd 1-3 ǂg 1 ǂi 32435065629404 ǂj 0 ǂl maise ǂs p ǂt 0 ǂx -

For a complete explanation on procedures for accompanying materials, go to this OSUL CAT document:
http://library.osu.edu/sites/techservices/accompanymatspolicy.php