No-where near Class 4!
Yeah, it says Class 4 on the card but the speeds are not even close! It took nearly an hour to transfer 1.8GB from my pc to my phone (htc desire) at approx' 540KB/s!
Class 4... 540KB/s... really?!
Did the same to the 4GB Class 2 card that came with the phone and it transferred at 1.76MB/s.