My EVO actually writes to sd card faster than it reads it. I test 3 different memory cards. The speed varies a little but the end result is the same. The write speed is much faster than the read speed. I only notice it now because I usually transfer files to the card and delete them later on. I finally made a few backup roms (4 at about 2GB total size) and tried to move to my laptop. Needless to say the process was slow (over 30 minutes). I can transfer the same files back into the card in the EVO in about 4 minutes.
Below is a same of my transfer speed in the EVO. The same card outside of the EVO has a write rate of 7-10 MBs and read rate of 17 MBs.
http://i175.photobucket.com/albums/w159/fithos_bucket/snap20100818_095238.png
Below is a same of my transfer speed in the EVO. The same card outside of the EVO has a write rate of 7-10 MBs and read rate of 17 MBs.
http://i175.photobucket.com/albums/w159/fithos_bucket/snap20100818_095238.png