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The following is an example of a record that uses the terms "CD-ROMs" and "Interactive multimedia" as describing the format of the item.

Title 245 0 0 Designated driver, safe ride program|h[electronic resource] :|bcommunity action guide /|cNational Highway Traffic Safety Administration.
Misc. 256 Electronic program.
Publication Info. 260 [Washington, D.C.?] :|bNational Highway Traffic Safety Administration,|c[2001]
Description 300 1 CD-ROM :|bsd., col. ;|c4 3/4 in.
Note 500 Title from dics. label.
Note 500 "October 2001."
Note 500 "Produced by ComTel Productions."
Note 500 Shipping list no.: 2002-0025-E.
Note 500 "ISO 9660 format."
Note 500 "DOT HS 809 1401"
Note 520 Review of road safety to show driving under the influence of alcohol can cause traffic violations and accidents and there is zero tolerance because drunkenness is a criminal law.
Note 538 System requirements: Pentium or faster processor ; Windows 95, 98, or 2000 ; 16 MB RAM minimum (32 recommended) ; 275 MB hard drive space ; CD-ROM drive.
Note 538 Disc characteristics: CD-ROM.
Subject 650 0 Traffic safety|vInteractive multimedia.
Subject 650 0 Drunk driving|zUnited States|vInteractive multimedia.
Subject 650 0 CD-ROMs.
Subject 650 0 Interactive multimedia.

Since this item is not about CD-ROMs or Interactive multimedia, those headings should be in 655 fields.

They use "Interactive multimedia" correctly as a subdivision in subfield "v"
They use it incorrectly in a 650. It should be in a 655. I could not find it in any of the "genre" thesauri.

The same with "CD-ROMs". It should be in a 655 field. This term is found in the Getty Art & Architecture Thesaurus as a descriptive term.

It is important for authority reasons to put subject terms that describe the piece in 655 fields or subfield "v's". If not it will look like:

System Note System requirements: Pentium or faster processor ; Windows 95, 98, or 2000 ;
                     16 MB RAM minimum (32 recommended) ; 275 MB hard drive space ; CD-ROM
                     drive. Disc characteristics: CD-ROM.
Subject         Traffic safety -- Interactive multimedia.
                     Drunk driving -- United States -- Interactive multimedia.
                     CD-ROMs.Interactive multimedia.

instead of like:

System Note System requirements: Pentium or faster processor ; Windows 95, 98, or 2000 ; 16 MB RAM minimum (32 recommended) ; 275 MB hard drive space ; CD-ROM drive.
Disc characteristics: CD-ROM.
Subject Traffic safety -- Interactive multimedia.
Drunk driving -- United States -- Interactive multimedia.
Genre/Form CD-ROMs.
Interactive multimedia.