The previou post is here:
http://www.synthzone.com/ubbs/Forum25/HTML/004547.html

where I had previously explained that:

1 2GB cards work ok for audio provided they are formatted in Jukebox or equivalent.

2 2GB cards with audio work fine in the 7000, just the % space reading is incorrect.

3 If you format a 2GB card in the 7000 you get a 1GB card with the rest unallocated and unusable space.

Additionally if a 2GB card does not work in Jukebox it just means it is a cheap or other card that does not meet the full SD.org specification. Get a quality card like standard SanDisk or similar. It is pointless buying fast cards for audio just for the 7k, but if you have a true sd compatible writer like e.g. the slots in toshiba laptops, then audio can be written faster than the usb1 panasonic writer supplied with the jukebox kit (which was made before usb2 was invented).

Unfortunately the process described in the post above is not a low level format, just a normal dos format thus will not erase the partition table or restore a card formatted in the 7k back to 2GB, it will still be 1GB with the rest unusable.

To restore a 2GB card formatted in the 7k the simplest method is just to format in jukebox. An alternative is to use this panasonic program which will do it quicker and be ready to accept audio:
http://panasonic.jp/support/global/cs/sd/download/sd_formatter.html