I have a sony laptop with 2 hard drives, but only drive C has all the data,about 98% space used, and drive D has about 1% space used. Sony advertises this laptop to have 20 GB of hard drive space. When I view drive C it has 9 GB of total space, and drive D has 11GB total space. Right now drive C is almost full and my computer runs ultra slow. How can I utilize the full potential of this computer? I found that I can drag and drop from C to D, but I am afraid to try this for fear I will not have access to the data in drive D. How does this work?

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