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2.Because a segment only has 65,635 bytes,we have to contain a 1MB file in many segments,right?

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UN-protected segments are 64KB big - in 16-bit, like in DOS operating system.
Protected mode segments, 32-bits x86 processor, are up to 2^31 Bytes long.
Protected-mode segments, 64-bit processor (e.g. a modern Pentium under Windows 7 64-bit) could be 2^62 Bytes or about.

commented: Right on :) +17
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