Quantum FIREBALL PLUS AS 10.2 Product Manual page 105

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
Description Description Description Description
Data structure revision number = 0x0004h
for this revision
1st attribute threshold
.....
.....
.....
30th attribute threshold
reserved (0x00)
Vendor specific
Data structure checksum
Total bytes
Table 6-20 Table 6-20 Table 6-20 Table 6-20
Description Description
Description Description
Attribute ID number
Attribute threshold (for comparison with
attribute values from 0x00 to 0xFFh)
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
Total bytes
Device Attribute Thresholds Data Structure
Individual Threshold Data Structure
Quantum Fireball Plus AS 10.2/20.5/30.0/40.0/60.0 GB AT
ATA Bus Interface and ATA Commands
Bytes Bytes Bytes Bytes Format Format Format Format
2 binary
12
12
18
131
1
512
Bytes Bytes Format Format
Bytes Bytes Format Format
1 binary
1 binary
10
12
Type Type Type Type
Rd only
Rd only
Rd only
Rd only
Rd only
Rd only
Type Type
Type Type
Rd only
Rd only
Rd only
6-43