Soo.. just build a new computer, its running windows 7 x64 business.. and whenever i use my sd card reader it wont work unless i change the drive letter.. OR I've booted the computer with the SD card already in the reader . I've tried multiple readers all known to be working, and multiple cards. what happens is when i place the card in the reader (without changing the drive letter) drive shows activity, and the drive will become visible, but never show the card, instead it registers it as a RAW card needing format.. If I go and change the drive letter and insert the card, it then works, once.. if i take it out and put it back in, no luck goes back to recognizing it as a RAW card. help?