Table 5-92Mode Parameter Header and Block Descriptor-Field Descriptions

Data Field

Description

 

 

Mode Data Length

Length of the returned data

Medium Type

Always zero (0)

 

 

Device-Specific

Bit 7 - This bit is set if the drive is write protected

Parameter

Bit 4 - This bit is always set to indicate that the drive supports cache memory.

Block Descriptor

Zero (0) if Block Descriptor (DBD) in MODE SENSE Command Descriptor Length sector is 0.

If DBD is 1, then the Block Descriptor Length is eight (8).

 

 

 

Number of Blocks

The value in this field specifies the number of logical blocks on the unit that are affected by the

 

current MODE SELECT command. When this field = 0, the MODE SELECT parameters are put

 

into effect for all logical blocks on the unit. The maximum value allowed is the total number of

 

initiator-addressable logical blocks for the value specified in the Block Length field. A value that

 

is less than the maximum value will decrease the number of initiator-accessible logical blocks to

 

the amount specified.

Block Length

The value in this field specifies the length, in bytes, of each block.

 

 

5.14.1Read-Only Mode Pages

Table 5-93lists read-only mode pages. Table 5-49lists initiator-changeable mode pages.

Table 5-93Read-Only Mode Pages

Page Code (Sub Page)

Page Name

Reports the drive's

Size (bytes)

 

 

 

 

03h

Format Device

Medium format

24

04h

Rigid Disk Geometry

Total cylinder head and

24

rotational speed

 

 

 

5.14.2Format Device Page (03h)

The Format Drive Page (Table 5-94)describes the drive's medium format. The data fields are described in Table 5-95.Note that the page is savable but no parameters are changeable.

Table 5-94Format Device Page-(Page 3)

Byte

 

 

Bit

7

6

5

 

4

3

 

2

 

1

0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

0

 

 

PS

Rsvd

 

 

 

Page Code (03h)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1

 

 

 

 

 

 

Page Length (16h)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2

-

3

 

 

 

 

 

Tracks Per Zone

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

4

-

5

 

 

 

 

 

Alternate Sectors/Zone

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

6

-

7

 

 

 

 

 

Alternate Tracks/Zone

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

8

-

9

 

 

 

 

Alternate Tracks/Logical Unit

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

10

-

11

 

 

 

 

 

Sectors/Track

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

12

-

13

 

 

 

 

Data Bytes/Physical Sector

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

14

-

15

 

 

 

 

 

Interleave

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

16

-

17

 

 

 

 

 

Track Skew Factor

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

18

-

19

 

 

 

 

 

Cylinder Skew Factor

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

20

 

SSEC

HSEC

RMB

 

SURF

 

 

Reserved

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

5-66 Maxtor Atlas 10K V