I bought this to add to my collection of SDHC cards for my various cameras, and to support the transport of files with work. I have used every other SDHC card I have ever owned with a memory card reader, and have been able to treat as a 'flash drive' for writing to. This card I cannot. The camera writes to it, and can format it ok, but as soon as you try and copy images to it (if you've downloaded from the camera and want to add an immge back to the camera) you cannot. sometimes it says the card/drive is write protected (it's not) and sometimes it says the device has disconnected (it hasn't) I guess the error message depends on which application you're using and how you're connected to it (I've tried with it attached to camera, printer and memory card reader). so, if you want a memory card ONLY for use in a camera, and never want to add images to it, only ever download, then woo-hoo it's the perfect item. If you want a memory card that behaves like any other memory card on the planet, then it isn't for you. Maybe I've got a defective one, I don't know, I'd love input on that. For now, I'm thinking about returning it.