Troubleshooting the SD Card
Having problems with your SD card? There’s plenty that can go wrong, so try following this advice:
First, make sure that the SD card is the right type. It has to be a MicroSD card, and can only be up to 32 GB.
Does the problem occur only when you connect your Droid X to your PC? If so, the problem may have to do with type of USB connection you’ve chosen. As described on Connecting Your Droid X to Your Computer, when you connect your Droid X, you have to choose a connection mode. If you use USB Mass Storage, you won’t be able to access your SD card from your Droid X while your computer is connected to your PC. If you need to get to your Droid X storage when it’s connected to your PC, pull down the Notification bar, tap the “USB connection” notification, and then choose either PC Mode or Windows Media Sync.
Note
Your Droid X may not be able to connect to your Mac in any mode other than USB Mass Storage.
Make sure the card is mounted—that it’s showing up in Windows Explorer or the Finder. If it’s not mounted, the Droid X won’t recognize it, and you can’t access files from it, or store files on it. To mount your SD card, press the Menu key on the Home screen or a pane, select Settings→“SD card & phone storage”, and then make sure that “Unmount SD card” is highlighted. If it isn’t, that’s your problem. Turn off your Droid X and restart it. If it’s mounted and you’re still having problems, turn off both your computer and your Droid X and restart them—that should ...
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