I bought an eKit 4-in-1 which will read USB drives, SD and Micro SD and has a mini USB too, for cameras and so on, which also allows charging via USB from another computer. It truly does the business. I'd been frustrated for weeks trying to import files from other devices, and resorted to Dropbox, which whilst useful in some situations, can be a bit long winded when I want a simple transfer from a USB drive.