HP C737990900 - Manual (Page 74)

74 Commands
key is set to UNIT ATTENTION . Additional sense is set to 2A01h (mode
parameters changed).
Mode Parameter Pages
Mode data is recovered from the drive by means of a Mode Sense command.
After modification, it is returned to the drive via a Mode Select command. In
real-life, many hosts do not use Mode Sense and return whatever Mode Select
data suits them into the drive.
Mode Page Representation
Certain conventions are used in the following Mode Parameter pages in order
to describe the nature of the parameters. Most parameters are given by name,
followed by a number in brackets. The brackets have the following meanings:
Mode Data Format
Mode data consists of a 4-byte header, optionally followed by block descriptor
and Mode Parameter pages:
Square brackets [ ] Square brackets indicate that the parameter may be modified. The number inside the
brackets is the default value for the field—in other words, the power-up or reset value.
■
M ODE SELECT may modify this value by sending the page with a new value
in the field.
■
M
ODE SENSE
(current values) will return the current value of the parameter.
■
M ODE SENSE (default values) will return the value in brackets [].
■
M ODE SENSE (changeable values) will return a value of all ones.
Round brackets ( ) Round brackets indicate that the parameter is fixed. The number inside the brackets is
the fixed value for the field.
■
M ODE SELECT must set the parameter to this value, otherwise CHECK
CONDITION will be reported with a sense key of ILLEGAL REQUEST .
■
M
ODE SENSE
(default values) will return the fixed value.
■
M ODE SENSE (changeable values) will return a value of all zeros.
7 6 5 4 3 2 1 0
1 (MSB)
Mode Parameter Header
3 (LSB)