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:''Read more about [[Global Descriptor Table]] or [[GDT for dummies]].''
 
In [[Protected Modemode]] you use a logical address in the form A:B to address memory. As in [[Real Mode]], A is the segment part and B is the offset within that segment. The registers in protected mode are limited to 32 bits. 32 bits can represent any integer between 0 and 4Gb.
 
Because B can be any value between 0 and 4Gb our segments now have a maximum size of 4Gb (Same reasoning as in real-mode).
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