IBM DTTA-351010 Hard Drive Specifications - Page 160

Off-Line Data Collection Status

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8 Seek Time Performance (*) 9 Power-On Hours Count 10 Spin Retry Count 12 Device Power Cycle Count 199 Ultra DMA CRC Error Count 12.31.2.2.2 Status Flag Definitions Bit Flag Name 0 Pre Failure/ Advisory bit 1 On Line Collective bit 2 5 Vendor Specific 6 15 Reserved bits Definition If 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. If bit = 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. If bit = 0, the Attribute Value is updated only during Off Line testing. If bit = 1, the Attribute Value is updated during On Line testing or during both On Line and Off Line testing. Always 0 Figure 116. Status Flag Definitions 12.31.2.2.3 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. In normalizing the raw data, the device will perform any necessary statistical validity checks to ensure that an instantaneous raw value is not improperly reflected in the normalized Attribute Value (i.e., one read error in the first 10 reads being interpreted as exceeding the read error rate threshold when the subsequent 1 billion reads all execute without error). The end points for the normalized values for all Attributes will be 1 (01h) at the low end, and 100 (64h) at the high end for the device which is ready for customer shipment. For Performance and Error Rate Attributes, values greater than 100 are also possible, up to a maximum value of 253 (FDh). 12.31.2.3 Off-Line Data Collection Status The value of this byte defines the current status of the off-line activities of the device. Bit 7 indicates Automatic Off-Line Data Collection Status. Bit 7 Automatic Off-Line Data Collection Status 1 Automatic Off-Line Data Collection is enabled. 0 Automatic Off-Line Data Collection is disabled. 152 OEM Specifications for DTTA-3xxxxx

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8
Seek Time Performance (*)
9
Power-On Hours Count
10
Spin Retry Count
12
Device Power Cycle Count
199
Ultra DMA CRC Error Count
12.31.2.2.2
Status Flag Definitions
Bit
Flag Name
Definition
0
Pre Failure/
If bit = 0, an Attribute Value less than or
Advisory bit
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.
If bit = 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
If bit = 0, the Attribute Value is updated
only during Off Line testing.
If bit = 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 bits
Always 0
Figure 116. Status Flag Definitions
12.31.2.2.3
Normalized Values:
The device will perform conversion of the raw Attribute Values to trans-
form 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. In normalizing the raw data, the device will perform
any necessary statistical validity checks to ensure that an instantaneous raw value is not improperly reflected
in the normalized Attribute Value (i.e., one read error in the first 10 reads being interpreted as exceeding the
read error rate threshold when the subsequent 1 billion reads all execute without error). The end points for
the normalized values for all Attributes will be 1 (01h) at the low end, and 100 (64h) at the high end for the
device which is ready for customer shipment.
For Performance and Error Rate Attributes, values greater
than 100 are also possible, up to a maximum value of 253 (FDh).
12.31.2.3
Off-Line Data Collection Status
The value of this byte defines the current status of the off-line activities of the device. Bit 7 indicates Auto-
matic Off-Line Data Collection Status.
Bit 7
Automatic Off-Line Data Collection Status
1
Automatic Off-Line Data Collection is enabled.
0
Automatic Off-Line Data Collection is disabled.
152
OEM Specifications for DTTA-3xxxxx