Hi All
Yesterday I Restored and Backed up about 50Mb of songs on two different makes of SD card. The results were:-
Panasonic Card - Back up time 3 minutes
Restore Time 10 minutes

Sandisk Card Back up time 10 minutes
Restore time 30 minutes

The times are approximate but are for the identical data.

It would seem that the Panasonic SZ-CB7 USB reader/writer prefers it's own make.

John