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The problem will also occur in other systems

In other systems, if we assume that the contents of a file will be represented by data at many locations within a physical machine, and that some of these locations will be unavailable after a crash, then there will be a similar problem. At best, the system may offer snapshots that are under complete control of the user. However, if a user has a data base stored in more than one file, after a crash these files will contain snapshots taken at different past times.

Paul McJones