Database Properties - File Size

[mikeg]

In one of my databases, Properties shows a file size of 9476096 bytes. The stored document, Rich Text and icon sizes total 4287094 bytes. What's using the other 5189002 bytes?

Is it unallocated space left over after I deleted some things? I'm curious because I read that it's no longer necessary to run compact and repair and I doubt that UR requires that much overhead!