Qword
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In computer science, a qword (quadruple word) is a unit of data that is twice the size of a dword or four times the size of a word. On the common 32-bit x86 platform, this unit of data would be 64 bits because the size of a Word on an x86 system is 16 bits. On the more recent AMD64/EM64T, which are 64-bit x86 architecture, this unit of data would be 256 bits long, because the Word size on a 64-bit system is 64 bits.
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