Hum, your windows 7 it works with other external drives?
When I am connected to the PC my phantom makes kind of low but annoying beeping noise. Some of PC's have different speeds on some of the USB ports. But Windows 7 computer that was not upgraded but shipped with W7 shouldn't have a problem. I' am still using XP. I never removed my SD card. Of coarse you have tried another cable and a computer?
That's all I got.