The use of an exchange medium (e.g., electronic, diskette, tape) is an integral part of sharing files of MARC 21 records.  The Exchange Media section includes media format and labeling specifications for electronic file transfer (Part 1), microcomputer diskettes (Part 2), and magnetic tape (Part 3 and Part 4) which are being used to exchange MARC 21 data.  The specifications vary slightly for each medium to allow better utilization of the technology involved.  Adherence to media format and labeling specifications is essential for successful exchange of MARC 21 records.

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Exchange Media