Western Digital Ultrastar DC HC310 - Table 231 Individual Attribute Data Structure

268
Western Digital Hard Disk Drive OEM Specification
11.51.2.2 Individual Attribute Data Structure
The following defines the 12 bytes that make up the information for each Attribute entry in the Device Attribute Data
Structure.
Description
Bytes
Offset
Attribute ID Number (01h to FFh)
1
00h
Status Flags
2
01h
Attribute Value (valid values from 01h to FDh)
1
03h
Vender specific
8
04h
Total Bytes
12
Table 231 Individual Attribute Data Structure
Attribute ID Numbers: Any non-zero value in the Attribute ID Number indicates an active attribute. The device
supports following Attribute ID Numbers.
ID
Attribute Name
0
Indicates that this entry in the data structure is not used
1
Raw Read Error Rate
2
Throughput Performance
3
Spin Up Time
4
Start/Stop Count
5
Reallocated Sector Count
7
Seek Error Rate
8
Seek Time Performance
9
Power-On Hours Count
10
Spin Retry Count
12
Device Power Cycle Count
22
Internal Environment status
192
Power off Retract count
193
Load Cycle count
194
Temperature
196
Reallocation Event Count
197
Current Pending Sector Count
198
Off-Line Scan Uncorrectable Sector Count
199
Ultra DMA CRC Error Count
Status Flag Definitions
Bit
Definition
0
Pre-failure/advisory bit
0
An Attribute Value less than or equal to its corresponding Attribute Threshold indicates an advisory
condition where the usage or age of the device has exceeded its intended design life period.
1
An Attribute Value less than or equal to its corresponding attribute threshold indicates a
pre-Failure condition where imminent loss of data is being predicted.
1
On-Line Collective bit
0
The Attribute Value is updated only during Off-Line testing
1
The Attribute Value is updated during On-Line testing or during both On-Line and Off-Line testing.
2-5
Vendor specific
6-15
Reserved (0)
Normalized Values: The device will perform conversion of the raw Attribute Values to transform them into
normalized values, which the host can then compare with the Threshold values. A Threshold is the excursion limit for
a normalized Attribute Value.