I have a Huawei Prism II, and my laptop is running Win7. When I connect it to my laptop's USB port, I get a notification that says "Connected as USB storage," but when I go to My Computer, the phone is showing as:
CD Drive (E:) Mobile Partner 0 bytes free of 7.75 MB CDFS
So the SD card's memory isn't available to transfer files. When I go to the Notifications screen and tap "Connected as USB storage", the radio button for "USB storage device" is already selected. I can select the "Media device (MTP)" option and successfully perform file transfer to/from my SD card this way, but I'm wondering why the "USB storage device" option doesn't make the SD card available.