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# Disk partitions
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A disk is divided up into [partitions](/Operating_Systems/Disks/Partitions.md) which are subsections of the overall disk. The kernel presents each partition as a [block device](/Operating_Systems/Devices.md#Devices.md) as it would with an entire disk.
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A disk is divided up into [partitions](/Operating_Systems/Disks/Partitions.md) which are subsections of the overall disk. The kernel presents each partition as a [block device](/Operating_Systems/Devices.md#Devices) as it would with an entire disk.
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The disk dedicates a small part of its contents to a **partition table**: this defines the different partitions that comprise the total disk space.
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There is a hierarchy within the user space with several different groups of user processes:
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<dl>
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<dt>Basic services</dt>
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<dd>Run at the bottom level and therefore are closest to ther kernel. Comprises small components that perform single, uncomplicated tasks. Examples include network configuration, the communication bus, and diagnostic logging</dd>
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<dt>Utiility services</dt>
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