Sony Handycam HDR-PJ790V Operating Manual page 49

If your camcorder does not recognize the

external media device, try the following
operations.
Reconnect the USB Adaptor Cable to your

camcorder.
If the external media device has the AC power

cord (mains lead), connect it to the wall outlet
(wall socket).
The number of scenes may be smaller

depending on the type of images recorded.
You cannot copy images from an external

media device to the internal memory on the
camcorder.
GB