30
U Series 9 Product Manual, Rev. C
47
(Bits 7–0) Maximum sectors per interrupt
on Read multiple and Write multiple (16)
8010
H
48
Reserved
0000
H
49
Standard Standby timer, IORDY sup-
ported and may be disabled
2F00
H
50
ATA-reserved
0000
H
51
PIO data-transfer cycle timing mode
0200
H
52
Retired
0200
H
53
Words 54–58, 64–70 and 88 are valid
0007
H
54
Number of current logical cylinders
xxxx
H
55
Number of current logical heads
xxxx
H
56
Number of current logical sectors per log-
ical track
xxxx
H
57–58
Current capacity in sectors
xxxx
H
59
Number of sectors transferred during a
Read Multiple or Write Multiple command
xxxx
H
60–61
Total number of user-addressable LBA
sectors available
(see Section 2.2 for related information)
*Note: The maximum value allowed in
this field is: 0FFFFFFFh (268,435,455
sectors, 137 Gbytes). Drives with capaci-
ties over 137 Gbytes will have
0FFFFFFFh in this field and the actual
number of user-addressable LBAs speci-
fied in words 100-103. This is required for
drives that support the 48-bit addressing
feature.
ST3160022A =0FFFFFFFh*
ST3120025A = 234,441,648
ST380012A = 156,301,488
62
Retired
0000
H
63
Multiword DMA active and modes sup-
ported (see note following this table)
xx07
H
64
Advanced PIO modes supported (modes
3 and 4 supported)
0003
H
Word
Description
Value
Содержание Barracuda 7200.7 ST3120025A
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