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Byte 0: Operation Code (12h)
Byte 1: Ignored Bit 7-5, Reserved Bit 4-2, CmdDt(0) Bit 1, EVPD(0 or1) Bit 0
Byte 2: Page Code (00h, 80h, or 83h)
Byte 3-4: Allocation Length
Byte 5: Control Byte (00h)