Hi tori, I just bought my N800 from a friend on Monday, I had my Transcend 8GB Class 6 SD card arrive yesterday. Intrigued by your post I decided to test the speed.

I managed to get a sustained write speed of 4.45MB/s to my SD card, heres how I tested it:

1) Install x-term and run these commands:

2) cd /media/mmc1
(to change the directory to where the SD card is mounted, in my case the external SD slot)

3) time dd if=/dev/zero of=deletethisfile bs=1M count=512
(what this does, is create a 512MB file, and times how long it takes to do it)

in my case, it took 1m 55s (115s). 512MB/115s = 4.45MB/s

You want to ensure that the file you create is roughly 2x the amount of ram the device has so that you know it's actually written the file to disk.

class 6 devices are supposed to be able to sustain 6MB/s IIRC, so I guess buying a faster SD card won't help.

Evan.