noun
recorded medium; pre-recorded data medium
Technical computing term for a medium that already contains recorded data, as opposed to a blank medium.
事前記録媒体からデータを読み出す。
Read data from a pre-recorded medium.
記録媒体 is a general term for any recording medium, while 事前記録媒体 specifically refers to a medium that already contains recorded data.
Compound of 事前 (beforehand), 記録 (record), and 媒体 (medium).