I have several different thumb drives and not a one will work any more on my Dell Inspiron 1545 running windows 7. They all work on other computers just fine but I get a message saying to format them. I don't want to lose my stuff so I do not format them. I can plug in printers, mouse, Iphone to any of the usb ports and there is no problem. I only have an issue with thumb drives. They previously worked just fine, just all of a sudden this problem exists.
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