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ATA Bus Interface and ATA Commands
Quantum Fireball Plus AS 10.2/20.5/30.0/40.0/60.0 GB AT
6-43
Table 6-19 defines the twelve bytes that make up the information for each threshold
entry in the device attribute thresholds data structure. Attribute entries in the
individual threshold data structure must be in the same order and correspond to the
entries in the individual attribute data structure.
The attribute ID numbers are vendor specific. Any non-zero value in the attribute
ID number indicates an active attribute.
Attribute threshold values are to be set at the factory and are not changeable in the
field.
The data structure checksum is the two’s compliment of the result of a simple eight-
bit addition of the first 511 bytes in the data structure.
Table 6-19
Table 6-19
Table 6-19
Table 6-19
Device Attribute Thresholds Data Structure
Table 6-20
Table 6-20
Table 6-20
Table 6-20
Individual Threshold Data Structure
Description
Description
Description
Description
Bytes
Bytes
Bytes
Bytes
Format
Format
Format
Format
Type
Type
Type
Type
Data structure revision number = 0x0004h
for this revision
2
binary
Rd only
1st attribute threshold
12
Rd only
.....
.....
.....
30th attribute threshold
12
Rd only
reserved (0x00)
18
Rd only
Vendor specific
131
Rd only
Data structure checksum
1
Rd only
Total bytes
512
Description
Description
Description
Description
Bytes
Bytes
Bytes
Bytes
Format
Format
Format
Format
Type
Type
Type
Type
Attribute ID number
1
binary
Rd only
Attribute threshold (for comparison with
attribute values from 0x00 to 0xFFh)
1
binary
Rd only
0x00 “always passing” threshold value to
be used for
code test purposes
0x01 minimum value for normal operation
0xFD maximum value for normal operation
0xFE invalid for threshold value - not to be
used
0xFF “always failing” threshold value to be
used for code test purposes
Reserved
10
Rd only
Total bytes
12
Summary of Contents for FIREBALL PLUS AS 10.2
Page 12: ...About This Manual 1 4 Quantum Fireball Plus AS 10 2 20 5 30 0 40 0 60 0 GB AT ...
Page 16: ...General Description 2 8 Quantum Fireball Plus AS 10 2 20 5 30 0 40 0 60 0 GB AT ...
Page 61: ...Basic Principles of Operation Quantum Fireball Plus AS 10 2 20 5 30 0 40 0 60 0 GB AT 5 16 ...
Page 62: ...Basic Principles of Operation 5 17 Quantum Fireball Plus AS 10 2 20 5 30 0 40 0 60 0 GB AT ...
Page 162: ...Index I 4 Quantum Fireball Plus AS 10 2 20 5 30 0 40 0 60 0 GB AT ...