In memory addressing for Intel x86 computer architectures, segment descriptors are a part of the segmentation unit, used for translating a logical address to a linear address.
Segment descriptors describe the memory segment referred to in the logical address.
[1] The segment descriptor (8 bytes long in 80286 and later) contains the following fields:[2] The x86 and x86-64 segment descriptor has the following form:[3] Where the fields stand for:
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