I connected my SF to my computer using the supplied cable and it charges no problem, but when the USB mode is set to Mass Mode, I get an unformatted drive in Windows 7 x64. Then I change it to Media Sync and it pops up as a SCH-i500 device and I can copy files to it, but after a few files, the USB connection dies and the SF says that the transfer is completed and it needs to shut down Media Sync. But after that, I can't get the USB connection to work unless I reboot my PC or plug into a new USB port. I am trying to use MediaMonkey to sync my music and it's just a terrible experience. Any thoughts on how to get the USB connection to work better?