Chances are that your problem is that you have a partition that Windows can't see (it could also be multiple partitions). That partition has the bulk of your SD card space.
Find a tool called EASEUS and download the free (home) version. Use it very carefully. The main thing is to be sure that you are working with the SD card, not a disk drive!
Read directions carefully and know what you are doing before you do it. I will give you the approximate steps, but do read the help pages. When you create the new partition, all of your old data will be gone.
You need to start EASEUS and select the SD drive. Right click on the SD drive and select the menu option to delete all partitions on the SD drive. Finally, select "Apply".
Once the partition is gone you will have to restart EASEUS. Right click on the SD card within EASEUS and select "Create partition". Check the parameters to ensure that the partition will consume all available space. When the partition is created, it will consist of all of your missing space.
One weird thing was that EASEUS abandoned something like 15 MB of space on the SD card, but I don't care. I will never miss it.
robryb
Last edited by robryb; 01-23-2012 at 06:28 PM.
Reason: Added a warning.
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