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What is "Allocated" space?
When Windows stores a file on a hard drive, it records the file's address so it can find it again. In Windows, there is a limited number of these disk addresses. Due to their limited number, each disk address represents a block of disk space. Therefore, even a 1 byte file will occupy, or be allocated, a complete block of space. On small drives this block can be as small as 512 bytes. But, on large drives, this block could be as large as 65,536 bytes. On these large drives, your 1 byte file is still only 1 byte in length, but is allocated 65,536 bytes of storage. The extra space is unusable by other files. To see the allocated space on your drive, display the Details view.
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