Some disk file systems are journaling file systems or versioning file systems.
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A page may be then transferred to or from any ordinary disk file, not necessarily a dedicated space.
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In a disk file system there is typically a master file directory, and a map of used and free data regions.
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Virtual mode also offers portability across storage hardware because it presents the consistent behavior as a virtual disk file.
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However, file systems built on top of SANs do provide file-level access, and are known as SAN filesystems or shared disk file systems.
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A disk file system takes advantages of the ability of disk storage media to randomly address data in a short amount of time.
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While disk file systems attempt to keep individual files contiguous, this is not often possible without significant performance penalties.
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Shared disk file systems allow multiple machines to use a single hard disk safely by coordinating simultaneous access to individual files.
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The mapped disk is presented as if it is a logical volume, or a virtual disk file, to the guest operating system and its real hardware characteristics are hidden.