Sony HDR-MV1 - Manual (Page 40)

Notes
You may not be able to supply power to the camcorder without the battery pack
attached.
Supplying power to the camcorder from a computer
By connecting the camcorder to a computer using the USB cable (supplied), you
can play back or import files to the computer while supplying power to the
camcorder.
Notes
The recording function is not available while supplying power from the
computer.
When you connect the camcorder to a computer using the USB cable during
playback, the USB connection screen appears. It will turn to the playback
screen if you select
[yes].
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