As you probably suspect, Windows doesn't show you everything that's on your hard drive. However, Disk Investigator does. It's a free, compact tool that searches your hard drives and displays everything that's on them, bypassing your operating system and reading the raw data, sector by sector. With it, you can examine raw directories, files, clusters, and system sectors, which is especially useful when you're reusing a disk or upgrading your OS. You can also use it to verify the effectiveness of disk-cleaning utilities and even recover deleted files and lost data, in many cases.
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