XTAL FSCK - 2010 -
Xtal: Crystal oscillator (abbreviation) A crystal oscillator is an electronic oscillator circuit that uses the mechanical resonance of a vibrating crystal of piezoelectric material to create an electrical signal with a very precise frequency
The system utility fsck (for "file system check") is a tool for checking the consistency of a file system in Unix and Unix-like operating systems. Before the rise of journaling file systems, it was common for an improperly shut-down Unix system's file system to develop a corrupted superblock. This possibly-serious problem could only be resolved by running fsck, which could take anywhere from a few seconds to hours, depending on the volume's size and disk I/O throughput. Because of the severity of fsck not being able to resolve this error, the terms "fsck" and "fscked" have come into use among Unix system administrators as a minced oath. It is unclear whether this usage was cause or effect, as it has been anecdotally reported that Dennis Ritchie has claimed "The second letter was originally different."