3 Commands—introduction

This chapter contains notes relating to the SCSI commands listed in Chapter .

Summary

The following table is a summary of the SCSI commands for sequential access devices, showing the operation code:

Opcode

Command Name

 

Opcode

Command Name

 

 

 

 

 

00h

TEST UNIT READY

 

2Bh

LOCATE

01h

REWIND

 

2Bh

SEEK (CD-ROM)

03h

REQUEST SENSE

 

34h

READ POSITION

05h

READ BLOCK LIMITS

 

3Bh

WRITE BUFFER

08h

READ

 

3Ch

READ BUFFER

08h

READ 6 (CD-ROM)

 

43h

READ TOC (CD-ROM)

0Ah

WRITE

 

44h

REPORT DENSITY SUPPORT

0Bh

SET CAPACITY

 

4Ch

LOG SELECT

10h

WRITE FILEMARKS

 

4Dh

LOG SENSE

11h

SPACE

 

55h

MODE SELECT (10)

12h

INQUIRY

 

56h

RESERVE UNIT (10)

13h

VERIFY

 

57h

RELEASE UNIT (10)

15h

MODE SELECT

 

5Ah

MODE SENSE (10)

16h

RESERVE UNIT

 

5Eh

PERSISTENT RESERVE IN

17h

RELEASE UNIT

 

5Fh

PERSISTENT RESERVE OUT

19h

ERASE

 

8Ch

READ ATTRIBUTE

1Ah

MODE SENSE

 

8Dh

WRITE ATTRIBUTE

1Bh

LOAD/UNLOAD

 

A0h

REPORT LUNS

1Bh

START/STOP UNIT (CD-ROM)

 

A3h (05h)

REPORT DEVICE IDENTIFIER

1Ch

RECEIVE DIAG RESULTS

 

A3h (0Ch)

REPORT SUPPORTED OPCODES

1Dh

SEND DIAGNOSTIC

 

A3h (0Dh)

REPORT SUPPORTED TASK MGMNT FNS

1Eh

PREVENT MEDIUM REMOVAL

 

A4h (06h)

SET DEVICE ID

25h

READ CAPACITY (CD-ROM)

 

ABh (01h)

READ MEDIA SERIAL NUMBER

28h

READ 10 (CD-ROM)

 

 

 

 

 

 

 

 

Command details

The command descriptions in Chapter 4 are listed in alphabetical order of command name. Each command is described briefly. This is followed by a list of pre-execution checks which are described below. The Command Descriptor Block (CDB) is then given, with details of the various parameter bits and fields.

Commands—introduction

Summary 29