MECH 2301 Lecture Notes - Lecture 40: Disk Partitioning, System Administrator
22 May 2018
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MECH 2301 Lecture 40 Notes
Introduction
MS-DOS
• Particularly MS-DOS and early versions of Windows were barely adequate to handle
numbers large enough to address all of the blocks on the small disks of the era.
• As a means of extending the capability of the file system to address all of the blocks on
larger disks, the disks themselves were partitioned.
• As the addressing capability of the file systems grew, disk partitioning was retained as a
means of creating separate logical spaces for the user
• As well as for making it possible to provide different types of files systems and/or
different operating systems on a single disk.
• On many systems, different disks or disk partitions from different disks and other
devices can be combined into a single file system.
• The file system must maintain a directory structure for each device or partition.
• In most cases, the directory for each device is stored on the device itself.
• In many computer systems, each file system is called a volume.
• On some of these systems, the directory is called a volume table of contents.
• The volumes are indicated for each file system organization shown
• In particular, note that the volume concept is relatively independent of the actual
physical disk configuration
• Instead tuned to the needs of the user(s) and the requirements of the system
administrator(s)
• On many systems, it is necessary to mount a volume, device, or partition before it can
be used.
• Mounting a volume means that the directory structure for the volume is merged into an
overall file structure for the system by attaching the directory structure of the volume to
some point in the overall file structure.
• This point is known as the mount point.
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