IBM DTCA-24090 Hard Drive Specifications - Page 161

Device Attribute Thresholds Data Structure

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12.30.2.8 S.M.A.R.T. Capability This word of bit flags describes the S.M.A.R.T. capabilities of the device. The device will return 03h as its S.M.A.R.T. capability which means: Bit Definition 0 Power mode attribute saving capability If bit = 1, the device will save its Attribute Values prior to going into a power saving mode (Standby or Sleep mode). 1 Attribute autosave after event capability The device supports the S.M.A.R.T. Enable/Disable Attribute Autosave subcommand. 2-15 Reserved (0) 12.30.2.9 Data Structure Checksum The Data Structure Checksum is the 2's compliment of the result of a simple 8-bit addition of the first 511 bytes in the data structure. 12.30.3 Device Attribute Thresholds Data Structure The following defines the 512 bytes that make up the Attribute Threshold information. This data structure is accessed by the host in its entirety using the SMART Read Attribute Thresholds. All multi-byte fields shown in these data structures follow the ATA-3 specification for byte ordering, namely that the least significant byte occupies the lowest numbered byte address location in the field. The sequence of active Attribute Thresholds will appear in the same order as their corresponding Attribute Values. Command Descriptions 153

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12.30.2.8
S.M.A.R.T. Capability
This word of bit flags describes the S.M.A.R.T. capabilities of the device. The device will return 03h as its
S.M.A.R.T. capability which means:
Bit
Definition
0
Power mode attribute saving capability
If bit =
1, the device will save its Attribute Values prior to going into a power saving mode
(Standby or Sleep mode).
1
Attribute autosave after event capability
The device supports the S.M.A.R.T. Enable/Disable Attribute Autosave subcommand.
2-15
Reserved (0)
12.30.2.9
Data Structure Checksum
The Data Structure Checksum is the 2's compliment of the result of a simple 8-bit addition of the first 511
bytes in the data structure.
12.30.3
Device Attribute Thresholds Data Structure
The following defines the 512 bytes that make up the Attribute Threshold information. This data structure is
accessed by the host in its entirety using the SMART Read Attribute Thresholds.
All multi-byte fields
shown in these data structures follow the ATA-3 specification for byte ordering, namely that the least signif-
icant byte occupies the lowest numbered byte address location in the field.
The sequence of active Attribute Thresholds will appear in the same order as their corresponding Attribute
Values.
Command Descriptions
153