Hi there
I bought a 4gb SD card, its brand I find is called Topram something I picked up cheap on Ebay.
I have had no success with it, its there its not there.
I was using it mainly for songs and email attachment files, but I find its a POS.
Looking at the
http://www.sdcard.org/home web site, its seems that your hardware has to support SD2.0 standard, its a new standard since 2006 I think.
Now looking at the age of the XV6700, Id say it only supports the sd 1.0 standard.
So Id say no its not going to work esp the HC versions
Unless someelse can tell me/us how to update the standard in the XV, Id say dont waste your money buy another 2gb card.