end of medium; EM
Technical term in computing and data storage, referring to the physical or logical end of a storage medium (e.g., tape, disk).
When the end of the tape medium is reached, rewinding starts automatically.
An end-of-medium marker has been detected.
媒体 means 'medium' in general; 媒体終端 specifically refers to the end point of that medium.
終端 means 'terminal' or 'end' in a broader sense; 媒体終端 is a compound specifically for storage media.
Compound of 媒体 (medium) and 終端 (end, terminal). A straightforward technical term with no known historical irregularities.