'Windows System Optimizer', and 'Disk Spy'

Windows System Optimizer

Windows System Optimizer Free Edition is an easy tool to clean and optimize your Windows System. Windows System Optimizer is a fast, powerful utility software that speeds up your system, giving you maximum performance.

http://free.windowssystemoptimizer.com/

Disk Spy

Access your hard disk on physical level and view areas usually hidden from you. DiskSpy enables you to view every sector of any installed hard disk drive. It is irrelevant if this sectors are bootsectors, partition tables, file system entries or simple data files. Also areas protected by the operating system are accessible, since DiskSpy is completely operating-system-independent.

http://www.miray.de/products/sat.diskspy.html