I work for JVC and would like to try to help.
The GZ-HD5 is part of a generation of JVC camcorders that was designed to work best with Apple using Firewire (iLink), not USB. Please understand that Firewire (iLink) only works when playing back videos that have been recorded by the camcorder in a special recording mode called 1440CBR. Here is some additional detail on making this work:
Preparation:
• Your camcorder has three recording quality modes: FHD, SP & 1440CBR. For this method, all video you would like to use in iMovie must be recorded on your camcorder in the 1440CBR mode. This is very important.
• When you are done recording, create a playlist with the recorded video you would like to edit.
• For playback, in your menu, make sure to choose the 1440CBR output on your HD Everio.
• Start your iMovie ’08/'09 software.
• You need a 4 pin to 6 pin i.Link cable—Don’t use USB.
• It is not necessary to install any additional software or plug ins to edit with iMovie ’08/'09 via i.Link.
Connect:
• Connect the 6 pin connector on the i.Link cable to the Apple computer & connect the 4 pin connector on the i.Link cable to the JVC HD Everio.
• The iMovie ’08/'09 import window should automatically open.
Import:
• In the camcorder, create a “Playlist” with the video scenes/clips you would like to import.
• Push the function button, choose “Dubbing Playback”, and choose a playlist
• Click through the on screen reminders until you get to “PREPARE THE RECORDING DEVICE”.
• At this point you can click “Import” on iMovie ’08/'09.
• When finished, the import stops automatically.
This is covered with some additional detail in your owner’s manual.
Editing:
• At this point the video has been imported and can be edited with iMovie ’08/'09.
Note #1: The GZ-HD3, GZ-HD5, GZ-HD6 and GZ-HD7 all work in a very similar manner, as does the GZ-HD40 when it is set to record in the 1440CBR MPEG2 (.tod) mode. Please refer to the original owner's manual for specifics on how to engage the dubbing playback mode with each model, as there are some minor variances. Think of this 1440CBR mode as the Apple/i.Link mode! If you want to connect via iLink, then this recording mode is mandatory.
Note #2: More recent 2008-2009 model JVC camcorders, such as the GZ-HD10, GZ-HM200, GZ-HD300, GZ-HD320 & GZ-HM400 all use a different recording format known as AVCHD which uses a .mts file extension. Additionally, the GZ-HD30 & GZ-HD40 models can be set to record in this AVCHD/.mts mode. This is the best choice for editing with a recent Apple computer and iMovie '08/'09. As long as your Apple uses an Intel processor, these camcorders are basically plug and play. Simply connect your USB cable and you can import/edit any video.
Note #3: If you did not use the 1440CBR mode, there are methods where you can connect through USB, but they are much more complicated.
In this case, you will need to install the JVC Quick Time Plug-in which comes on CD-ROM with the camcorder, as well as the Quick Time Plug In update which is available at this website:
http://www2.cli.co.jp/products/ne/updateqtc_for_gzhd7/qtc3eupdate.htm
While it is possible to connect via USB and make things work, it is much more complex than sticking to 1440CBR and using iLink.
There is a well written e-book that covers these other methods which many people have found to be of benefit. The book is written by Steve Mullen. Here is a link to his website:
http://www.mindspring.com/~d-v-c/page2/page2.html
I hope this is helpful.