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12.21.10.1 QUEUED READ LOG DMA EXT FEATURE FIELD
SUPPORTED bit
If the QUEUED READ LOG DMA EXT FEATURE FIELD SUPPORTED bit is set to one, the device supports the
READ LOG DMA EXT subcommand of the with encapsulation of the READ LOG DMA EXT FEATURE field. If the
QUEUED READ LOG DMA EXT FEATURE FIELD SUPPORTED bit is cleared to zero, the device does not support
the READ LOG DMA EXT subcommand of the RECEIVE FPDMA QUEUED command with encapsulation of the
READ LOG DMA EXT FEATURE field.
12.21.10.2 QUEUED READ LOG DMA EXT SUPPORTED bit
If the QUEUED READ LOG DMA EXT SUPPORTED bit is set to one, the device supports the READ LOG DMA EXT
subcommand of the RECEIVE FPDMA QUEUED (65h). If the QUEUED READ LOG DMA EXT SUPPORTED bit is
cleared to zero, the device does not support the READ LOG DMA EXT subcommand of the RECEIVE FPDMA
QUEUED command. The QUEUED READ LOG DMA EXT SUPPORTED bit shall be set to one if the QUEUED READ
LOG DMA EXT FEATURE FIELD SUPPORTED bit is set to one.
12.21.10.3 QUEUED WRITE LOG DMA EXT SUPPORTED bit
If the QUEUED WRITE LOG DMA EXT SUPPORTED bit is set to one, the device supports the WRITE LOG DMA
EXT subcommand of the SEND FPDMA QUEUED command (See Table 203). If the QUEUED WRITE LOG DMA
EXT SUPPORTED bit is cleared to zero, the device does not support the WRITE LOG DMA EXT command of the
SEND FPDMA QUEUED command.
12.21.11
Rebuild Assist log (log page 15h)
See Section 10.17 for a description of the Rebuild Assist Feature.
If the device supports the Rebuild Assist feature (i.e., IDENTIFY DEVICE data Word 78 bit 11 is set to one), then the
Rebuild Assist log shall be supported.
Table 149 Rebuild Assist log (15h) data structure definition
Byte
7
6
5
4
3
2
1
0
0
Reserved
Rebuild
Assist
Enabled
1…6
Reserved
7
Physical Element Length (N)
8
(MSB)
Disabled Physical Element Mask
(LSB)
7 + N
8 + N
(MSB)
Disabled Physical Elements
(LSB)
7+(2×N)
8+(2×N)..511
Reserved
Physical Element Length
The Physical Element Length field indicates the number of bytes in the Disabled Physical Element Mask field and the
number of bytes in the Disabled Physical Elements field.
The device shall ignore any attempt by the host to change the value of this field when writing to the Rebuild Assist
log.
Disabled Physical Element Mask
The Disabled Physical Element Mask field indicates that bits in the Disabled Physical Elements field are supported.
The device shall ignore any attempt by the host to change the value of this field when writing to the Rebuild Assist
log.
216
Hard Disk Drive Specification