Sony DCR-TRV39 - Manual (Page 55)

2-6-3 USB Capture Preferences (Windows only)
Sets the settings related to the USB capture mode.
Preference window
Check that the USB Capture Mode is selected, then click the "Preferences" button on the selector
bar to display the preference window described below.
Prefix for Newly Captured Files
Input and set the prefix for names used for capture files.
For example, if you input "ABC," then the captured file names will be, in order of capture, "ABC0001",
"ABC0002", "ABC0003".
Destination of Captured/Recorded Files
Sets the location to which the captured files and such will be saved in capture mode.
To change the destination, click the "Browse" button, select the new destination folder and click the
"OK" button.
Movie Capture Settings