IBM DARA-206000 Hard Drive Specifications - Page 170

Device Attributes Data Structure

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If the device detects a Threshold Exceeded Condition for prefailure attributes, the device loads F4h into the Cylinder Low register, 2Ch into the Cylinder High register, clears BSY, and asserts INTRQ. Advisory attributes never result in negative reliability condition. 12.31.1.11 SMART Enable/Disable Automatic Off-Line (Subcommand DBh) This subcommand enables and disables the optional feature that cause the device to perform the set of offline data collection activities that automatically collect attribute data in an off-line mode and then save this data to the device's non-volatile memory. This subcommand may either cause the device to automatically initiate or resume performance of its off-line data collection activities or cause the automatic off-line data collection feature to be disabled. A value of zero written by the host into the device's Sector Count register before issuing this subcommand shall cause the feature to be disabled. Disabling this feature does not preclude the device from saving attribute values to non-volatile memory during some other normal operation such as during a power-on or power-off sequence or during an error recovery sequence. A value of F8h written by the host into the device's Sector Count register before issuing this subcommand shall cause this feature to be enabled. Any other non-zero value written by the host into this register before issuing this subcommand is vender specific and will not change the current Automatic Off-Line Data Collection status, but device may respond with the error code specified in Figure 124 on page 173. 12.31.2 Device Attributes Data Structure The following defines the 512 bytes that make up the Attribute Value information. This data structure is accessed by the host in its entirety using the SMART Read Attribute Values subcommand. 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. 160 OEM Specifications of DARA-2xxxxx 2.5 inch H D D Rev 2.1

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If the device detects a Threshold Exceeded Condition for prefailure attributes, the device loads F4h into the
Cylinder Low register, 2Ch into the Cylinder High register, clears BSY, and asserts INTRQ.
Advisory attri-
butes never result in negative reliability condition.
12.31.1.11
SMART Enable/Disable Automatic Off-Line (Subcommand DBh)
This subcommand enables and disables the optional feature that cause the device to perform the set of off-
line data collection activities that automatically collect attribute data in an off-line mode and then save this
data to the device's non-volatile memory. This subcommand may either cause the device to automatically
initiate or resume performance of its off-line data collection activities or cause the automatic off-line data
collection feature to be disabled.
A value of zero written by the host into the device's Sector Count register before issuing this subcommand
shall cause the feature to be disabled. Disabling this feature does not preclude the device from saving attri-
bute values to non-volatile memory during some other normal operation such as during a power-on or
power-off sequence or during an error recovery sequence.
A value of F8h written by the host into the device's Sector Count register before issuing this subcommand
shall cause this feature to be enabled. Any other non-zero value written by the host into this register before
issuing this subcommand is vender specific and will not change the current Automatic Off-Line Data Col-
lection status, but device may respond with the error code specified in Figure 124 on page 173.
12.31.2
Device Attributes Data Structure
The following defines the 512 bytes that make up the Attribute Value information. This data structure is
accessed by the host in its entirety using the SMART Read Attribute Values subcommand. 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.
160
OEM Specifications of DARA-2xxxxx 2.5 inch HDD Rev 2.1