I recently bought a Sandisk 512 MB SD card for use in my Tungsten T. It worked fine at first. Then all the data was corrupted. I reformatted the card using Windows XP and a card reader. I then put the card in the Tungsten and it said that it needed to be reformatted - did I want to have the Tungsten do it now? I said yes. Ever since then I cannot read the card in the card reader - I get a 'not responding' error for the drive. If I put the card into the Tungsten I receive a "The handheld cannot recognize this card" error. What can I do?