If your high-capacity USB or SD card is showing only a fraction of its size, it is likely due to incorrect partitioning or "unallocated space". Right-click the Start button and select Disk Management .
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Find your drive. You will likely see a small "Primary Partition" and a large "Unallocated" block. If your high-capacity USB or SD card is
Right-click the existing partition and select (this erases data on that drive). Download128 MB