Sony SLV-M20HF Operating Instructions Manual page 39

Labelling a recorded program and tape (page 47)
You can attach an electronic "label" to the video tape and its programs on
the SmartFile list. Labelling the recorded programs enables you to find a
program easily when you want to play it back.
Protecting a recorded program (page 52)
You can protect a recorded program from accidental over-recording or
erasure.
Erasing the data of an unwanted program (page 54)
By erasing a program from the SmartFile list, the VCR will record over the
unwanted program.
Storing program data from the DSS receiver
(Program Data Download) (page 55)
If you connect a DSS receiver equipped with the Program Data Download
function, you can store the program and category name transmitted from the
DSS on a SmartFile tape. The DSS receiver equipped with the Data
Download function will be available in the future.
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SmartFile Function