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 2 to your PC? If so, the problem may have to do with the type of USB connection you’ve chosen. As described on Transferring Music, Videos, and Pictures from a PC Using Windows Media Player, when you connect your Droid 2, 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 2 while your phone is connected to your PC. If you need to get to your Droid 2 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.
Make sure the card is mounted—that it’s showing up in Windows Explorer or the Finder. If it’s not mounted, the Droid 2 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 any 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 2 and restart it. If it’s mounted and you’re still having problems, turn off both your computer and your Droid 2 and restart them—that should remount the SD card.
Try removing the SD card and putting it back in or replacing it with a new one. From the Home screen or a panel, press the Menu key, and then choose Settings→“SD card & phone storage”. Tap “Unmount SD card”. After several minutes, the card will be unmounted—the Droid 2 reports you have no SD storage available.
Next, turn off the phone’s power and remove the battery, as described earlier in this chapter (Fixing a Frozen Phone). Slide out the MicroSD card. Examine it to make sure it’s not damaged. If it’s not damaged, slide it back into the empty space, replace the battery, and turn on your Droid 2. That may fix the problem. If the card is damaged, put in a new one.
If all else fails, try reformatting your SD card. This option erases all its data, so do it as a last resort. From the Home screen or a panel, press the Menu key, and then choose Settings→“SD card & phone storage”. Tap “Format SD card”, and then tap “Format SD card” from the screen that appears, to confirm that’s what you want to do. After the card is formatted, either turn off your Droid 2 and turn it on again, or connect it to a PC or Mac via the USB connection, and after the computer recognizes the phone, unplug the USB cord. In both cases, the Droid 2 should recognize the card.