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7K200 SATA OEM Specification 
163/173 
 
14.47  Write Log Ext (3Fh) 
Command Block Output Registers 
  Command Block Input Registers 
Register 
7 6 5 4 3
2
1
0  Register 
7
6 5 4 3 2
1
0
Data 
Low 
- - - - -
-
-
-  Data 
Low 
-
- - - - -
-
-
Data 
High 
- - - - -
-
-
-  Data 
High 
-
- - - - -
-
-
Current 
- - - - -
-
-
-  Error 
...See 
Below... 
Feature 
Previous  - - - - -
-
-
-   
 
 
 
Current 
V V V V V V V V  
HOB=0
-
-  -  -  -  -
-
-
Sector Count 
Previous  V V V V V V V V  
Sector Count 
HOB=1
-
- - - - -
-
-
Current 
V V V V V V V V  
HOB=0
-
-  -  -  -  -
-
-
LBA Low 
Previous  - - - - -
-
-
-  
LBA Low 
HOB=1
-
- - - - -
-
-
Current 
V V V V V V V V  
HOB=0
-
-  -  -  -  -
-
-
LBA Mid 
Previous  V V V V V V V V  
LBA Mid 
HOB=1
-
- - - - -
-
-
Current 
- - - - -
-
-
-  
HOB=0
-
- - - - -
-
-
LBA High 
Previous  - - - - -
-
-
-  
LBA High 
HOB=1
-
- - - - -
-
-
Device 
- - - - -
-
-
-  Device 
-
- - - - -
-
-
Command 
0 0 1 1 1
1
1
1  Status 
...See 
Below... 
Error Register 
 
Status Register 
7 6 5 4 3 2 1 0 
 
7 6 5 4 3 2 1 0 
CRC 
UNC 0 IDN 0 ABT T0N AMN  BSY
RDY DF
DSC
DRQ 
COR IDX
ERR
V  V 0 V 0 V  0  0  0  V 0 V  -  0  0  V 
Table 131 Write Log Ext Command 
This command writes a specified number of 512 byte data sectors to the specific log. The device 
shall interrupt for each DRQ block transferred. 
Output Parameters To The Device 
Sector Count Current 
The number of sectors to be written to the specified log low 
order, bits (7:0).   
Sector Count Previous 
The number of sectors to be written to the specified log high
orders, bits (15:8). If the number of sectors is greater than the
number indicated in the Log directory, which is available in Log
number zero, the device shall return command aborted. The log
transferred to the device shall be stored by the device starting at
the first sector in the specified log. 
Sector Number Current 
The log to be written as described in 
Table 110 Log sector 
addresses
 definition. If the host attempts to write to a read only 
log address, the device shall return command aborted. 
Cylinder Low Current 
The first sector of the log to be written low order, bits (7:0). 
Cylinder Low Previous 
The first sector of the log to be written high order, bits (15:8) 
If the feature set associated with the log specified in the Sector Number register is not 
supported or enabled, or if the values in the Sector Count, Sector Number or Cylinder Low 
registers are invalid, the device shall return command aborted. If the host attempts to write to a 
read only log address, the device shall return command aborted.