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:

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.

•MODE SELECT may modify this value by sending the page with a new value in the field.

•MODE SENSE (current values) will return the current value of the parameter.

•MODE SENSE (default values) will return the value in brackets [].

•MODE 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.

•MODE SELECT must set the parameter to this value, otherwise CHECK CONDITION will be reported with a sense key of ILLEGAL REQUEST.

•MODE SENSE (default values) will return the fixed value.

•MODE SENSE (changeable values) will return a value of all zeros.

Mode data format

Mode data consists of a 4-byte header, optionally followed by block descriptor and Mode Parameter pages:

 

 

7

6

5

4

3

2

1

0

 

 

 

 

 

 

 

 

 

 

 

1

(MSB)

 

 

Mode Parameter Header

 

 

 

 

 

 

 

 

 

 

 

 

3

 

 

 

 

 

(LSB)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

4

(MSB)

 

 

Mode Block Descriptor

 

 

 

 

 

 

 

 

 

 

 

 

11

 

 

 

 

 

(LSB)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

12

(MSB)

 

 

Mode Parameter Pages

 

 

 

 

 

 

 

 

 

 

 

 

n

 

 

 

 

 

(LSB)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Mode parameter pages

HP Ultrium drives support the following pages:

•01h “Read-Write Error Recovery mode page” on page 76

•02h “Disconnect-Reconnect page” on page 78

•0Ah “Control mode page” on page 79

•0Fh “Data Compression log page” on page 68

•10h “Device Configuration page” on page 81

•11h “Medium Partitions mode page” on page 83

Commands

MODE SELECT 15h/55h 73