Don't know. If the original disk has operating instructions on it for the camera, then these would have to be transfered to the new disk.
This maybe better in the digital forum, try asking in there.
Also, there must be someone who's tried this, and he/she's prob put the results on the net. After all the Linux community has modded the ipod in several ways.
Just did a google with 'jvc digital camcorder hard disk upgrade' as the subject, take a look