Linux filesystems are responsible for organizing how data is stored and retrieved. Over time – due to sudden power failures, forced shutdowns, hardware issues, or software bugs – a filesystem can become corrupted, and certain parts of it may become inaccessible.
When that happens, you need a reliable way to detect and fix those inconsistencies before they cause data loss or system instability. This is where fsck (File System Consistency Check) comes in.
In this article, we’ll cover everything you need to know about fsck from basic usage to running it safely on root and production partitions.