My almost full 8gb card ususally takes about 3 minutes to be fully scanned. Only once did it get stuck while scanning and a battery pull solved it. Does this happen all the time?
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Whcih BB do you have? If it has hot-swappable microsd slot, take it out, and do a battery pull. When the device boots back up put the sd card back in. Start media and it may scan. Don't access any files just let it scan it may take a few minutes. After it has fully scanned that bar should go away.
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