> (irq_stat 0x40000001)	

	IRQ status of the chip
quoted text
> tag 0
	Tag (or zero for non NCQ commands)
quoted text
> cmd 0xb0
	The ATA command number issued
quoted text
> emask 0x1
	Internal libata error category (used to decide what to do to
recover)
quoted text
> stat 0x51
	Status register of drive
quoted text
> err 0x4
	Error register of drive


You want the ATA specification document from T13 (www.t13.org)

Alan
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