Table 5-56Mode Parameter Block Descriptor-Field Descriptions

 

 

Field

Description

 

 

 

If the number of blocks is set to zero, the device shall retain its current capacity if the

 

block size has not changed. If the number of blocks is set to zero and the block size has

 

changed, the device shall be set to its maximum capacity when the new block size takes

 

effect.

 

If the number of blocks is greater than zero and less than or equal to its maximum ca-

 

pacity, the device shall be set to that number of blocks. If the block size has not changed,

 

the device shall not become format corrupted. This capacity setting shall be retained

Number of Blocks

through power cycles, hard resets, logical unit resets and I_T nexus losses:

If the number of blocks field is set to a value greater than the maximum capacity of the

 

 

device and less than FFFF FFFFh, then the command is terminated with a CHECK

 

CONDITION status. The sense key is set to ILLEGAL REQUEST. The device shall re-

 

tain its previous block descriptor settings; or

 

If the number of blocks is set to FFFF FFFFh, the device shall be set to its maximum

 

capacity. If the block size has not changed, the device shall not become format corrupt-

 

ed. This capacity setting shall be retained through power cycles, hard resets, logical unit

 

resets, and I_T nexus losses.

Block Length

This field specifies the length, in bytes, of each logical sector.

 

 

5.12.4Categories of Changeable Pages

The drive’s changeable pages are described on the following pages. The data fields for each of these pages fall into one of the categories described in Table 5-57.

 

Table 5-57Categories of Changeable Pages

 

 

Category

Description

 

 

 

A field in this category can be modified by the MODE SELECT command, can be saved and can

Fully Supported

affect the drives processing. The drive uses the value in the field and, if the SP bit is set, preserves

the new value of the field in non-volatile memory on the drive. (The PS bit must have been set

 

when the mode page was returned with a MODE SENSE command.)

 

 

Ignored

A value in this field is never used or validated; it is never looked at by the drive. Ignored fields are

not underlined in the Mode Parameter Pages’ figures or tables and are not described in the Field

 

Description tables.

5.12.5Unit Attention Condition Page (00h)

The Unit Attention Page is used to enable or disable the generation of Unit Attention Conditions. The Unit Attention Condition Page format and field descriptions are described in Table 5-58and Table 5-59respectively.

Table 5-58Unit Attention Condition Page (Page 0)

Bit

7

6

5

4

3

2

 

1

0

Byte

 

 

 

 

 

 

 

 

 

 

0

PS

Rsvd

 

 

Page Code (00h)

 

 

 

 

 

 

 

 

 

 

 

1

 

 

 

Page Length (02h)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2

 

Reserved

 

DUA

 

Reserved

 

 

 

 

 

 

 

 

 

 

 

 

3

 

 

 

Reserved

(00h)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

5-38 Maxtor Atlas 10K V