JTAG ONLY
Guiformat.... http://www.megaupload.com/?d=XCLQBZI7
Isoextract... http://www.megaupload.com/?d=JCCV6H4G
You will need two programs to get this done. A program to format your harddrive to fat32 , and a program to extract your iso. I will be using Guiformat to format my harddrive , and Isoextract to extract my iso 's . Isoextract will batch extract a whole folder & guiformatter will format large capacity Hard drives.
Step 1 (formatting your external Hdd)

Step 2 (extracting iso) Keep in mind I will be extracting multiple iso's in this tutorial. If the foldre you select has iso's that you dont want extracted. Simply uncheck it.

Once extraction is complete unplug your External harddrive from your computer and plug it to the back of your 360 usb port. Load up xexmenu and your games will now be showing , ready to play.
**Note**
If you are using Freestyle dash and the games dont show there , you will have to change the path..