SCSI Description
￿￿￿￿56#46The START￿5612￿STOP70+6￿UNIT%QOOCPFcommand￿￿￿$enablesJ￿or disables the logical unit for media access operations. This command gives the initiator remote control over drive spin- up and spin-down. The data format and field descriptions are shown in Table 5-205and Table -206respectively.
A jumper (or backplane connection) is used to select the spin-up mode. When configured for remote control of spin-up (Option 3), the drive requires a START STOP UNIT Command to spin up. See Chapter 3 for jumper-programming instructions for your specific hard disk drive.
START STOP UNIT Command Descriptor Block-Data Format

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Operation Code (1Bh)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Reserved

 

 

Immed

 

 

 

 

 

 

 

 

 

 

 

 

 

 

- 3

 

 

 

 

 

 

 

Reserved

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Power Conditions

 

 

Reserved

 

LoEj

 

Start

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Control

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

$[VG$KV

￿￿START STOP￿UNIT￿Command￿-Field Descriptions￿

￿

￿

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Immediate. When 1, the drive returns GOOD status immediately after validat-

 

Immed(KGNF

 

 

ing the Command Descriptor Block, but before the drive spins up.

 

 

 

 

 

 

 

 

&GUETKRVKQP

 

 

 

 

 

 

 

 

When 0, the drive does not return GOOD status until after the drive has spun

 

 

 

 

 

up successfully and is ready for media access commands.

 

 

 

 

 

 

 

 

 

 

LoEj

 

 

Load Eject. This value must be zero, because the disk drive contains non-re-

 

 

 

movable medium.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Table5-205

 

When Start is 1, the unit spins up (if it is not currently spinning) and is left

 

 

in a state where subsequent media access commands can succeed.

 

 

Start

 

 

When the value is 0, the drive spins down. Subsequent media access com-

 

 

 

 

 

 

 

 

 

 

mands are rejected with CHECK CONDITION status and the proper sense da-

 

 

 

 

 

ta.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Power

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ConditionsTable5-206The Power Conditions field is not supported.

 

 

 

5-166 Maxtor Atlas 10K III

Page 230
Image 230
Maxtor 10K III manual 205, Operation Code 1Bh Reserved Immed, Power Conditions Reserved LoEj Start Control