Practical and lightweight utility developed to calculate and verify cryptographic hashes of files, such as CRC-32, MD5, SHA-1, SHA-256, and SHA-512.
Excellent software for disk defragmentation.
Utility that displays many information about USB drives connected to the computer.
Graphically observe the usage of your HD.

Portable version of this powerful file defragmenter.
Hard drive diagnostic software for Windows, with testing, health, performance, and detailed information in a user-friendly interface.