IBM DTCA-24090 Hard Drive Specifications - Page 159

Off-Line Data Collection Status

Get IBM DTCA-24090 - Travelstar 4.1 GB Hard Drive PDF manuals and user guides View all IBM DTCA-24090 manuals
Add to My Manuals
Save this manual to your list of manuals

Page 159 highlights

12.30.2.2.2 Status Flag Definitions Bit Flag Name 0 Pre Failure/ Advisory bit 1 On Line Collective bit 2 5 Reserved bits 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 only during On Line testing may either 0 or 1 Always 0 Figure 97. Status Flag Definitions 12.30.2.2.3 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. For Performance and Error Rate Attributes, values greater than 100 are also possible, up to a maximum value of 253 (FDh). 12.30.2.3 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 0 Automatic Off-Line Data Collection is enabled. 1 Automatic Off-Line Data Collection is disabled. Bits 0 thru 6 represents a hexadecimal status value reported by the device. Value Definition 0 Off-line data collection never started Command Descriptions 151

  • 1
  • 2
  • 3
  • 4
  • 5
  • 6
  • 7
  • 8
  • 9
  • 10
  • 11
  • 12
  • 13
  • 14
  • 15
  • 16
  • 17
  • 18
  • 19
  • 20
  • 21
  • 22
  • 23
  • 24
  • 25
  • 26
  • 27
  • 28
  • 29
  • 30
  • 31
  • 32
  • 33
  • 34
  • 35
  • 36
  • 37
  • 38
  • 39
  • 40
  • 41
  • 42
  • 43
  • 44
  • 45
  • 46
  • 47
  • 48
  • 49
  • 50
  • 51
  • 52
  • 53
  • 54
  • 55
  • 56
  • 57
  • 58
  • 59
  • 60
  • 61
  • 62
  • 63
  • 64
  • 65
  • 66
  • 67
  • 68
  • 69
  • 70
  • 71
  • 72
  • 73
  • 74
  • 75
  • 76
  • 77
  • 78
  • 79
  • 80
  • 81
  • 82
  • 83
  • 84
  • 85
  • 86
  • 87
  • 88
  • 89
  • 90
  • 91
  • 92
  • 93
  • 94
  • 95
  • 96
  • 97
  • 98
  • 99
  • 100
  • 101
  • 102
  • 103
  • 104
  • 105
  • 106
  • 107
  • 108
  • 109
  • 110
  • 111
  • 112
  • 113
  • 114
  • 115
  • 116
  • 117
  • 118
  • 119
  • 120
  • 121
  • 122
  • 123
  • 124
  • 125
  • 126
  • 127
  • 128
  • 129
  • 130
  • 131
  • 132
  • 133
  • 134
  • 135
  • 136
  • 137
  • 138
  • 139
  • 140
  • 141
  • 142
  • 143
  • 144
  • 145
  • 146
  • 147
  • 148
  • 149
  • 150
  • 151
  • 152
  • 153
  • 154
  • 155
  • 156
  • 157
  • 158
  • 159
  • 160
  • 161
  • 162
  • 163
  • 164
  • 165
  • 166
  • 167
  • 168
  • 169
  • 170
  • 171
  • 172
  • 173
  • 174
  • 175
  • 176
  • 177
  • 178
  • 179
  • 180
  • 181
  • 182
  • 183
  • 184
  • 185
  • 186
  • 187
  • 188
  • 189
  • 190
12.30.2.2.2
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
only during On Line testing
25
Reserved bits
may either 0 or 1
6 15
Reserved bits
Always 0
Figure 97. Status Flag Definitions
12.30.2.2.3
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.
For Performance and Error Rate Attributes, values greater than 100 are also possible, up to a
maximum value of 253 (FDh).
12.30.2.3
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
0
Automatic Off-Line Data Collection is enabled.
1
Automatic Off-Line Data Collection is disabled.
Bits 0 thru 6 represents a hexadecimal status value reported by the device.
Value
Definition
0
Off-line data collection never started
Command Descriptions
151