There has been talk in the Desire forum of the fault where the SD card will no longer be detected by the phone. It will suggest reformatting. But resetting phone or reinserting card is often the required action to take. I have not heard of anyone else having this problem on the Hero (1.5) but it is driving me bonkers. The shipped 2Gb card worked ok. A new 4Gb had this problem. I have send this one card back to ScanDisk. The second 4Gb card eventually corrupted so badly it will no longer reformat. And the third 4Gb card will not remain recognised for more than a few minutes. Making the phone unusable. I am wondering if any other Hero users have experienced this. I do not know for sure if this is a HTC issue a card issue or and Android issue.