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I have no problem using my US Cellular SIII this way. It does not show up as a "Lettered" drive but as a connected phone (SCH-R530U)? I can read and write to both the SD and internal memory by cut paste, click and drag, etc. to copy a file or folder to the phone, but I cannot use something like MS Word to save a document directly. Must save it first to computer then copy to phone. Windows 7 Pro and XP Pro