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Miscellaneous
A logical device is the combination of two or more separate devices. To form a logical
device, the sector address spaces of the constituent devices are concatenated to form a
single continuous address space.
A device can be partitioned , or subdivided into one or more regions (called partitions )
each consisting of a number of consecutive sectors. Typically, structures are written to the
device instructing software as to the location and size of these partitions. This file system
suite supports DOS partitions .
A volume is a device or device partition with a file system. A device or device partition
must go through a process called mounting to become a volume, which includes finding
the file system and making it ready for use. The name by which a volume is addressed may
also be called the volume’s mount point .
A device or volume may be formatted to create a new file system on the device. For
disambiguation purposes, this process is also referred to as high-level formatting . The
volume or device will automatically be mounted once formatting completes.
For certain devices, it is either necessary or desirable to perform low-level formatting .
This is the process of associating logical sector numbers with areas of the device.
A file system driver is a code module which allows the general-purpose file system suite
to access a specific type of file system. For example, this file system suite includes a FAT file
system driver.
FAT (File Allocation Table) is a common file system type, prevalent in removable media
that must work with various OSs. It is named after its primary data structure, a large table
that records what clusters of the disk are allocated. A cluster , or group of sectors, is the
minimum data allocation unit of the FAT file system.
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