Hitachi VT-UX605A Owner's Manual page 57

Basic Operations (Tape Navigation)
If the duration of time a is less than five minutes (15 minutes in the EP mode), nothing
is displayed. If the duration is five minutes or more, it is displayed as Program A and the
recording time is changed to time a.
If the duration of time b is five minutes (15 minutes in EP mode) or more, it is
displayed as Program B. If the duration is less than five minutes, nothing is displayed
Example 3
If you record program D using Tape Navigation on a tape on which programs A, B and
C were recorded by another VCR:
* Program C remains unerased, but BLANK is displayed.
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