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vnd(4) is the virtual disk driver found in NetBSD. It provides a disk-like interface to files which allows you to treat them as if they were disks. This is useful, for example, when a file holds a file system image (e.g. the typical ISO-9660 files) and you want to inspect its contents. Up until now vnd(4) used the vnode's bmap and strategy operations to access the backing file. These operate at the block-level and therefore do not involve any system-wide caches; this is why they were used (see below).