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from the completion of processing a power on reset until a subsequent power on reset; or a download microcode
activation; or shall be the largest number of pages of Internal Status Data that the device is capable of returning.
The device shall return data for all pages with page numbers less than the log size reported in the General Purpose
Log Directory for this log (i.e., 24h). The current device internal status data is the data representing the internal state
of the device at the time the Current Device Internal Status Data log was read with the FEATURE field set to 0001h
and shall not change until the device processes a subsequent read of the Current Device Internal Status Data log
with bit 0 in the FEATURE field set to one and a download microcode activation and a power on reset; and a software
reset. The current device internal status data may be retrieved by one or more reads of log pages within the range of
0..n. The Current Device Internal Status Data log consists of three areas.
12.21.14.1 Current Device Internal Status Data header page
Table 153 Current Device Internal Status Data header (page 0)
Offset
Type
Description
0
Bytes
LOG ADDRESS field (see Section 12.21.14.1.1)
1..3
Bytes
Reserved
4..7
DWord
Organization identifier (see Section 12.21.14.1.2)
Bit
Description
31:24
Reserved
23:0
IEEE OUI field
8..9
DEVICE INTERNAL STATUS DATA AREA 1 LAST LOG PAGE field
(see Section 12.21.14.1.3)
10..11
DEVICE INTERNAL STATUS DATA AREA 2 LAST LOG PAGE field
(see Section 12.21.14.1.4)
12..13
DEVICE INTERNAL STATUS DATA AREA 3 LAST LOG PAGE field
(see Section 12.21.14.1.5)
14..381
Reserved
382
SAVED DATA AVAILABLE field (see Section 12.21.14.1.6)
383
SAVED DATA GENERATION NUMBER field (see Section
12.21.14.1.7)
384..511
Bytes
REASON IDENTIFIER field (see Section 12.21.14.1.8)
12.21.14.1.1
LOG ADDRESS field
The LOG ADDRESS field shall be set to 24h. 12.21.14.1.2 Organization identifier
The IEEE OUI field shall contain a 24-bit canonical form OUI assigned by the IEEE to the organization that is able to
interpret the Current Device Internal Status Data in this log.
12.21.14.1.3
DEVICE INTERNAL STATUS DATA AREA 1 LAST
LOG PAGE field
The DEVICE INTERNAL STATUS DATA AREA 1 LAST LOG PAGE field contains the value of the last log page of
Device Internal Status data area 1 within the Device Internal Status data pages. If the Device Internal Status data
area 1 does not contain data, the DEVICE INTERNAL STATUS DATA AREA 1 LAST LOG PAGE field shall be
cleared to zero. If the DEVICE INTERNAL STATUS DATA AREA 1 LAST LOG PAGE field is not cleared
to zero, the Device Internal Status data area 1 begins at page one; and ends at the page indicated by the DEVICE
INTERNAL STATUS DATA AREA 1 LAST LOG PAGE field.
219
Hard Disk Drive Specification