Sony HDW-M2000 - Manual (Page 39)

Chapter 3
Preparations
Chapter 3 Preparations
3-9
Large cassette
Small cassette
Press in the red record inhibit plug. (“ON”)
Return this plug to its original position to enable recording on the
tape again. (“OFF”)
3-5-3 Preventing Accidental
Erasure of Recordings
To prevent a tape from being inadvertently erased,
press in the red record inhibit plug on the cassette.