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ATAPI Interface Chapter 5
Seagate Travan 40 Product Manual Page 57
Media Format Recognition field is intended for use by the MODE SENSE
command, in which it is set to 03h, indicating that the drive is capable of recognizing
the format and partition of the tape automatically. This is per QIC-157D, table 5-45.
This field is ignored in MODE SELECT commands.
Page Code 1Ch is used for TapeAlert Diagnostics.
Page Code 1Ch—TapeAlert Diagnostics
Data Bits
Byte 7 6 5 4 3 2 1 0 Hex
0 0 0 Page Code 1C
1 Page Length 0A
2 Perf Reserved Dexcpt Test Resrvd LgErr XX
3 Reserved MRIE XX
4
5
6
7
Interval Timer
XX
8
9
10
11
Report Count / Test Flag Number
XX
The Page Code is set to 1Ch. The purpose of the TapeAlert Mode page is similar to
the SMART disc diagnostic interface. The TapeAlert Mode page will return to the
default settings when a bus reset is received. The following fields are in the Mode
page:
Dexcpt (Default set to 1): When this bit is set to 0 the reporting method indicated by
the MRIE field is used. When this bit is set to 1 this indicates that the target shall
disable all information exception operations, ignoring the MRIE field (in this mode the
software must poll the TapeAlert Log page). Thus to enable “Check Condition”
mode, set the bit to 0.
LogErr (Default set to 0): When this bit is set to 0, this indicates that the logging of
informational exception conditions within a target is vendor specific. When this bit is
set to 1, the target shall log informational exception conditions.
Perf (Default set to 0): When this bit is set to 0, this indicates that informational
exception operations that can cause delays are acceptable. When this bit is set to 1,
the target shall not cause delays while doing informational exception operations (may
cause the target to disable some or all of the informational exception operations).
Test (Default set to 0): When this bit is set to 0, this indicates that the target shall
not generate any false/test informational exception conditions.
When this bit is set to one and Test Flag Number is set to 0, the target will generate
a false informational exception condition based on the MRIE field (the Interval Timer
field is ignored and the Report Count field is used as the Test Flag Number). When a
false information exception condition is posted, the TapeAlert flags in the Log page
are not modified. However, real informational exception conditions have priority over
false informational exception conditions. The Test bit will be automatically cleared
when the false information exception condition is posted on the first command
(excluding Inquiry and Request Sense) that is received with no real information
exception condition pending. The false informational exception condition will then be