I do think you can do it that way but thats not how I do it, there is an easier way. You should have got a chord with your Sony Video Cam (dont need to buy anything), it would be what most call a charge chord with the plug in on the end and USB connection on other end.
1) Just pull the plug off the end, connect it to USB on computer.
2) Then on your Sony video cam the handle part has that USB chord tucked into it, pull that out.
3) Plug that USB you untucked into end of chord.
4) Now just go to windows explorer and you can copy and paste your videos to the computer. Be sure to turn the video cam ON by opening the screen (which automatically turns on the video cam). Then you will see the new drive appear on your explorer.