Changes to files and properties

To save a file back to the storage device, the file must be moved from RAM or virtual memory onto the disk. If there is a power failure during the writing process, it is difficult to know which bits of the file are correct and which aren't. This is a particular problem because RAM is volatile, and therefore the changes that were made will have been lost in the power failure. In order to prevent this problem, filesystems can conduct an additional step, which involves storing the changes in a journal on non-volatile memory (normally the storage device) before the original file location is overwritten. The journal should not be confused with logs. The journal is not typically accessed by anything other than the ...

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