New answers tagged sd-card
There are many programs that will import photos from a memory card, so you might want to get more information so that people don't have to guess. Image Capture imports images and then once they are verified - deletes only the files. This deletion is easily reversed with run of the mill "camera card software" that recovers deleted files. See ...
Use Disk Utility to repartition the drive. It should be able to accomplish everything you need, including reformatting as well if you need it.
I was having this same problem and was able to get the device to show up again by 'Force Quitting' the Finder. When the Finder restarted after the force quit my drive showed up in the devices sidebar again. To force quit hold down Option + Command + Escape, a dialog box will pop up showing you a list of all the applications that you're currently running, ...
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