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A Dangerous C Disk-Write Example and How to Study It Safely

· 2 min read
Apache Wangye
Software developer and technical writer

This early C exercise demonstrates how a program can open a Windows physical drive and overwrite its first sector.

Warning: the original code can corrupt critical disk structures, make the operating system unbootable, and cause permanent data loss. Do not run it on a real machine or any disk containing valuable data. It is retained here only as a security-education example. A safe exercise should replace the physical-drive path with an ordinary test file inside an isolated virtual machine.

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