Thanks again for all the info.

Can you please test your card speed in N770? I have sandisk 1GB (normal rs-mmc,single voltage) and read speed is 1,3MB/s. Is this card faster?

you can test it in xterm as root by command
time dd if=/dev/mmcblk0 of=/dev/null bs=4096 count=2500

This will read 10MB from the card and print time.
But please remove and reinsert card before testing so the data is not already cached (or open the card door at least).

My card reads 10MB in real time 7.07s so the speed is 1.3MB/s. Is this Kingston MMCMobile significantly faster? Thanks.

7.07s here too, with the kingston 1GB MMCm. I think in the 770 its not faster, just lower power, so same speed with longer battery life.

idem for me with a 512 MB MMCm Kingston
O Fred