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#2381
The unallocated space is free. It just needs you to create a partition in it. You can do it in disk management. Just right click the unallocated space and from the context menu select "Create New Simple Volume".
If you want it to be one partition you can also use disk management to extend the existing partition. Macrium could have done that for you because there is an option to resize the partition. There is info on how to do that here Restoring an image from Windows - Knowledgebase 8.0 - Macrium Reflect Knowledgebase