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Implement feature called journaling

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Most modern file systems (Ext4, NTFS, HFS+, etc) implement a feature called journaling, meaning that any changes made to the disk are first recorded in a journal before being committed to the disk. This way, if power is cut during a disk write operation, the incorrect partial changes can be rolled back or re-applied based on the journal entry. Btrfs does not implement "journaling" in the traditional sense, but does still provide the ability to cleanly recover after a failed write. How and why does this work?

Reference no: EM133216902

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