It doesn't. I could only fix it by going back to
the setting "on time". Evidently entering an
early figure has the opposite effect.
The following let me set how many minutes early or are added to the end
of all recordings. I am using the Windows 8 version of Media Center so
things might be different in Windows 7.
To change the start time and end time of a recording
By default, Media Center starts recording a show two minutes before its
scheduled time and stops recording three minutes after its scheduled
time. You can change these settings to allow for more time on either end
unless there is a scheduling conflict.
In your box you might need to tell it to start recording all shows 3 or
4 minutes prior to the start time in order for the PC to keep up with
the demands on the system.
Click the Start button Picture of the Start button, click All
Programs, and then click Windows Media Center.
On the Media Center start screen, scroll to Tasks, click Settings,
click TV, click Recorder, and then click Recording Defaults.
Do one of the following:
Under Start when possible, click the Plus‌ Picture of the Plus
button or Minus‌ Picture of the Minus button button to choose when you
want to begin a recording.
Under Stop when possible, click the Plus‌ Picture of the Plus
button or Minus‌ Picture of the Minus button button to choose when you
want to end a recording.
Click Save.
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You can add additional time to the end of a specific recording or series
but that is the end time not the start time. I do that by going to:
On the Media Center start screen, scroll to TV, click recorded TV,
click view scheduled (near the top of the screen).
Then click on Series.
Then LEFT click the mouse on the item you want to change the stop time on.
Then click on Series Settings
The bottom item on that page should be Stop: (there you can add to the
stop time of that individual recording session. It will add to the stop
time for an entire series, like I do for sporting events, or for an
individual recording that really is not part of a series.
I personally add 4 hours to sporting events like NASCAR or Baseball just
in case of rain delays or some such. No problem for me using the extra
storage space as I delete them after watching them.
It does help to have multiple tuners like in my box so I can record two
or three shows at a time or record up to two while watching one live...
