Seagate ST32000641AS, ST33000651AS Number of current logical heads, Current capacity in sectors

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Word	Description	Value
48	Reserved	0000H
49	Standard Standby timer, IORDY supported and may be dis-	2F00H
	abled
50	ATA-reserved	0000H
51	PIO data-transfer cycle timing mode	0200H
52	Retired	0200H
53	Words 54–58, 64–70 and 88 are valid	0007H
54	Number of current logical cylinders	xxxxH
55	Number of current logical heads	xxxxH
56	Number of current logical sectors per logical track	xxxxH
57–58	Current capacity in sectors	xxxxH
59	Number of sectors transferred during a Read Multiple	xxxxH
	or Write Multiple command
	Total number of user-addressable LBA sectors available
	(see Section 2.1 for related information)
	*Note: The maximum value allowed in this field is:
60–61	0FFFFFFFh (268,435,455 sectors, 137Gb). Drives with	0FFFFFFFh*
	capacities over 137Gb will have 0FFFFFFFh in this field and
	the actual number of user-addressable LBAs specified in
	words 100-103. This is required for drives that support the
	48-bit addressing feature.
62	Retired	0000H
63	Multiword DMA active and modes supported	xx07H
	(see note following this table)
64	Advanced PIO modes supported (modes 3 and 4 sup-	0003H
	ported)
65	Minimum multiword DMA transfer cycle time per word (120	0078H
	nsec)
	Recommended multiword DMA transfer cycle time per
66	word	0078H
	(120 nsec)
67	Minimum PIO cycle time without IORDY flow control (240	00F0H
	nsec)
68	Minimum PIO cycle time with IORDY flow control (120 nsec)	0078H
69–74	ATA-reserved	0000H
75	Queue depth	001FH
76	Serial ATA capabilities	xxxxH
77	Reserved for future Serial ATA definition	xxxxH
78	Serial ATA features supported	xxxxH
79	Serial ATA features enabled	xxxxH

32 Barracuda XT SATA Product Manual, Rev. D