Contents

• Foreword
• Introduction
• 1 Scope
• 2 Normative references
• 3 Definitions, symbols and abbreviations
  • 3.1 Definitions
  • 3.2 Symbols and abbreviations
• 4 General
  • 4.1 Overview
  • 4.2 Conventions
• 5 Physical characteristics
  • 5.1 Physical description
  • 5.2 Cable requirements
    • 5.2.1 Single-ended cable
    • 5.2.2 Differential cable
    • 5.2.3 Cable requirements for fast synchronous data transfer
  • 5.3 Connector requirements
    • 5.3.1 Non-shielded connector requirements
      • 5.3.1.1 Non-shielded connector alternative 1 - A cable
      • 5.3.1.2 Non-shielded connector alternative 2 - A cable
      • 5.3.1.3 Non-shielded connector - B cable
    • 5.3.2 Shielded connector requirements
      • 5.3.2.1 Shielded connector alternative 1 - A cable
      • 5.3.2.2 Shielded connector alternative 2 - A cable
      • 5.3.2.3 Shielded connector - B cable
    • 5.3.3 Connector contact assignments
  • 5.4 Electrical description
    • 5.4.1 Single-ended alternative
      • 5.4.1.1 Output characteristics
      • 5.4.1.2 Input characteristics
    • 5.4.2 Differential alternative
      • 5.4.2.1 Output characteristics
      • 5.4.2.2 Input characteristics
    • 5.4.3 Terminator power
    • 5.4.4 RESERVED lines
  • 5.5 SCSI bus
  • 5.6 SCSI bus signals
    • 5.6.1 Signal values
    • 5.6.2 OR-tied signals
    • 5.6.3 Signal sources
  • 5.7 SCSI bus timing
    • 5.7.1 Arbitration delay
    • 5.7.2 Assertion period
    • 5.7.3 Bus clear delay
    • 5.7.4 Bus free delay
    • 5.7.5 Bus set delay
    • 5.7.6 Bus settle delay
    • 5.7.7 Cable skew delay
    • 5.7.8 Data release delay
    • 5.7.9 Deskew delay
    • 5.7.10 Disconnection delay
    • 5.7.11 Hold time
    • 5.7.12 Negation period
    • 5.7.13 Power-on to selection time
    • 5.7.14 Reset to selection time
    • 5.7.15 Reset hold time
    • 5.7.16 Selection abort time
    • 5.7.17 Selection time-out delay
    • 5.7.18 Transfer period
  • 5.8 Fast synchronous transfer option
  • 5.8.1 Fast assertion period
  • 5.8.2 Fast cable skew delay
  • 5.8.3 Fast deskew delay
  • 5.8.4 Fast hold time
  • 5.8.5 Fast negation period
• 6 Logical characteristics
  • 6.1 SCSI bus phases
    • 6.1.1 BUS FREE phase
    • 6.1.2 ARBITRATION phase
    • 6.1.3 SELECTION phase
    • 6.1.3.1 SELECTION time-out procedure
    • 6.1.4 RESELECTION phase
      • 6.1.4.1 RESELECTION
      • 6.1.4.2 RESELECTION time-out procedure
    • 6.1.5 Information transfer phases
      • 6.1.5.1 Asynchronous information transfer
      • 6.1.5.2 Synchronous data transfer
      • 6.1.5.3 Wide data transfer
    • 6.1.6 COMMAND phase
    • 6.1.7 Data phase
      • 6.1.7.1 DATA IN phase
      • 6.1.7.2 DATA OUT phase
    • 6.1.8 STATUS phase
    • 6.1.9 Message phase
      • 6.1.9.1 MESSAGE IN phase
      • 6.1.9.2 MESSAGE OUT phase
    • 6.1.10 Signal restrictions between phases
  • 6.2 SCSI bus conditions
    • 6.2.1 Attention condition
    • 6.2.2 Reset condition
    • 6.2.2.1 Hard reset alternative
    • 6.2.2.2 Soft reset alternative
  • 6.3 SCSI bus phase sequences
  • 6.4 SCSI pointers
  • 6.5 Message system description
  • 6.6 Messages
  • 6.6.1 ABORT
  • 6.6.2 ABORT TAG
  • 6.6.3 BUS DEVICE RESET
  • 6.6.4 CLEAR QUEUE
  • 6.6.5 COMMAND COMPLETE
  • 6.6.6 DISCONNECT
  • 6.6.7 IDENTIFY
  • 6.6.8 IGNORE WIDE RESIDUE
  • 6.6.9 INITIATE RECOVERY
  • 6.6.10 INITIATOR DETECTED ERROR
  • 6.6.11 LINKED COMMAND COMPLETE
  • 6.6.12 LINKED COMMAND COMPLETE (WITH FLAG)
  • 6.6.13 MESSAGE PARITY ERROR
  • 6.6.14 MESSAGE REJECT
  • 6.6.15 MODIFY DATA POINTER Message
  • 6.6.16 NO OPERATION
  • 6.6.17 Queue tag messages
    • 6.6.17.1 HEAD OF QUEUE TAG
    • 6.6.17.2 ORDERED QUEUE TAG
    • 6.6.17.3 SIMPLE QUEUE TAG
  • 6.6.18 RELEASE RECOVERY
  • 6.6.19 RESTORE POINTERS
  • 6.6.20 SAVE DATA POINTER
  • 6.6.21 SYNCHRONOUS DATA TRANSFER REQUEST message
  • 6.6.22 TERMINATE I/O PROCESS
  • 6.6.23 WIDE DATA TRANSFER REQUEST message
• 7 SCSI commands and status
  • 7.1 Command implementation requirements
    • 7.1.1 Reserved
    • 7.1.2 Operation code types
  • 7.2 Command descriptor block
    • 7.2.1 Operation code
    • 7.2.2 Logical unit number
    • 7.2.3 Logical block address
    • 7.2.4 Transfer length
    • 7.2.5 Parameter list length
    • 7.2.6 Allocation length
    • 7.2.7 Control field
  • 7.3 Status
  • 7.4 Command examples
    • 7.4.1 Single command example
    • 7.4.2 Disconnect example
    • 7.4.3 Linked command example
  • 7.5 Command processing considerations and exception conditions
    • 7.5.1 Programmable operating definition
    • 7.5.2 Incorrect initiator connection
    • 7.5.3 Selection of an invalid logical unit
    • 7.5.4 Parameter rounding
    • 7.5.5 Asynchronous event notification
    • 7.5.6 Unexpected reselection
  • 7.6 Contingent allegiance condition
  • 7.7 Extended contingent allegiance condition
  • 7.8 Queued I/O processes
    • 7.8.1 Untagged queuing
    • 7.8.2 Tagged queuing
    • 7.8.3 Example of queued I/O process
    • 7.8.3.1 Typical sequences for tagged queuing
    • 7.8.3.2 Example of tagged queuing
  • 7.9 Unit attention condition
• 8 All device types
  • 8.1 Model for all device types
    • 8.1.1 SCSI addresses
      • 8.1.1.1 SCSI device address
      • 8.1.1.2 Logical units
      • 8.1.1.3 Target routines
    • 8.1.2 Commands implemented by all SCSI devices
    • 8.1.2.1 Using the INQUIRY command
    • 8.1.2.2 Using the REQUEST SENSE command
    • 8.1.2.3 Using the SEND DIAGNOSTIC command
    • 8.1.2.4 Using the TEST UNIT READY command
  • 8.2 Commands for all device types
    • 8.2.1 CHANGE DEFINITION command
    • 8.2.2 COMPARE command
    • 8.2.3 COPY command
      • 8.2.3.1 Errors detected by the managing SCSI device
      • 8.2.3.2 Errors detected by a target
      • 8.2.3.3 COPY function code 00h and 01h
      • 8.2.3.4 COPY function code 02h
      • 8.2.3.5 COPY function code 03h
      • 8.2.3.6 COPY function code 04h
      • 8.2.3.7 Copies with unequal block lengths
    • 8.2.4 COPY AND VERIFY command
    • 8.2.5 INQUIRY command
      • 8.2.5.1 Standard INQUIRY data
      • 8.2.5.2 Vital product data
    • 8.2.6 LOG SELECT command
    • 8.2.7 LOG SENSE command
    • 8.2.8 MODE SELECT(6) command
    • 8.2.9 MODE SELECT(10) command
    • 8.2.10 MODE SENSE(6) command
      • 8.2.10.1 Current values
      • 8.2.10.2 Changeable values
      • 8.2.10.3 Default values
      • 8.2.10.4 Saved values
      • 8.2.10.5 Initial responses
    • 8.2.11 MODE SENSE(10) command
    • 8.2.12 READ BUFFER Command
      • 8.2.12.1 Combined header and data mode (000b)
      • 8.2.12.2 Vendor-specific mode (001b)
      • 8.2.12.3 Data mode (010b)
      • 8.2.12.4 Descriptor mode (011b)
    • 8.2.13 RECEIVE DIAGNOSTIC RESULTS command
    • 8.2.14 REQUEST SENSE Command
      • 8.2.14.1 Sense-key specific
      • 8.2.14.2 Deferred errors
      • 8.2.14.3 Sense key and sense code definitions
    • 8.2.15 SEND DIAGNOSTIC Command
    • 8.2.16 TEST UNIT READY Command
    • 8.2.17 WRITE BUFFER command
    • 8.2.17.1 Combined header and data mode (000b)
    • 8.2.17.2 Vendor-specific mode (001b)
    • 8.2.17.3 Data mode (010b)
    • 8.2.17.4 Download microcode mode (100b)
    • 8.2.17.5 Download microcode and save mode (101b)
  • 8.3 Parameters for all device types
  • 8.3.1 Diagnostic parameters
    • 8.3.1.1 Supported diagnostic pages
  • 8.3.2 Log parameters
    • 8.3.2.1 Buffer over-run/under-run page
    • 8.3.2.2 Error counter pages
    • 8.3.2.3 Last n error events page
    • 8.3.2.4 Non-medium error page
    • 8.3.2.5 Supported log pages
  • 8.3.3 Mode parameters
    • 8.3.3.1 Control mode page
    • 8.3.3.2 Disconnect-reconnect page
    • 8.3.3.3 Peripheral device page
  • 8.3.4 Vital product data parameters
  • 8.3.4.1 ASCII implemented operating definition page
  • 8.3.4.2 ASCII information page
  • 8.3.4.3 Implemented operating definition page
  • 8.3.4.4 Supported vital product data pages
  • 8.3.4.5 Unit serial number page
• 9 Direct-access devices
  • 9.1 Direct-access device model
    • 9.1.1 Removable medium
    • 9.1.2 Logical blocks
    • 9.1.3 Ready state
    • 9.1.4 Initialization
    • 9.1.5 Medium defects
    • 9.1.6 Data cache
    • 9.1.7 Reservations
    • 9.1.8 Seek and rezero
    • 9.1.9 Notched drives
    • 9.1.10 Rotational position locking
    • 9.1.11 Relative addressing
    • 9.1.12 Error reporting
    • 9.1.13 Examples
    • 9.1.13.1 Rotating media
    • 9.1.13.2 Sequential media
    • 9.1.13.3 Memory media
  • 9.2 Commands for direct-access devices.
    • 9.2.1 FORMAT UNIT command
      • 9.2.1.1 Defect list formats
      • 9.2.1.2 Initialization pattern option
    • 9.2.2 LOCK UNLOCK CACHE command
    • 9.2.3 PRE-FETCH command
    • 9.2.4 PREVENT ALLOW MEDIUM REMOVAL command
    • 9.2.5 READ(6) command
    • 9.2.6 READ(10) command
    • 9.2.7 READ CAPACITY command
    • 9.2.8 READ DEFECT DATA command
    • 9.2.9 READ LONG command
    • 9.2.10 REASSIGN BLOCKS command
    • 9.2.11 RELEASE command
      • 9.2.11.1 Logical unit release
      • 9.2.11.2 Extent release
      • 9.2.11.3 Third-party release
    • 9.2.12 RESERVE command
      • 9.2.12.1 Logical unit reservation
      • 9.2.12.2 Extent reservation
      • 9.2.12.3 Third-party reservation
      • 9.2.12.4 Superseding reservations
    • 9.2.13 REZERO UNIT command
    • 9.2.14 SEARCH DATA commands
      • 9.2.14.1 SEARCH DATA EQUAL command
      • 9.2.14.2 SEARCH DATA HIGH command
      • 9.2.14.3 SEARCH DATA LOW command
    • 9.2.15 SEEK(6) and SEEK(10) commands
    • 9.2.16 SET LIMITS command
    • 9.2.17 START STOP UNIT command
    • 9.2.18 SYNCHRONIZE CACHE command
    • 9.2.19 VERIFY command
    • 9.2.20 WRITE(6) command
    • 9.2.21 WRITE(10) command
    • 9.2.22 WRITE AND VERIFY command
    • 9.2.23 WRITE LONG command
    • 9.2.24 WRITE SAME command
  • 9.3 Parameters for direct-access devices
    • 9.3.1 Diagnostic parameters
      • 9.3.1.1 Translate address page - SEND DIAGNOSTIC
      • 9.3.1.2 Translate address page - RECEIVE DIAGNOSTIC
    • 9.3.2 Log parameters
    • 9.3.3 Mode parameters
    • 9.3.3.1 Caching page
    • 9.3.3.2 Flexible disk page
    • 9.3.3.3 Format device page
    • 9.3.3.4 Medium types supported page
    • 9.3.3.5 Notch and partition page
    • 9.3.3.6 Read-write error recovery page
    • 9.3.3.7 Rigid disk drive geometry page
    • 9.3.3.8 Verify error recovery page
  • 9.4 Definitions specific to direct-access devices
• 10 Sequential-access devices
  • 10.1 Sequential-access device model
    • 10.1.1 Physical elements
    • 10.1.2 Data storage characteristics
    • 10.1.3 Partitions within a volume
    • 10.1.4 Logical elements within a partition
    • 10.1.5 Data buffering
    • 10.1.6 Recorded object descriptors (block identifiers)
    • 10.1.7 Direction and position definitions
    • 10.1.8 Error reporting
  • 10.2 Command descriptions for sequential-access devices
    • 10.2.1 ERASE command
    • 10.2.2 LOAD UNLOAD command
    • 10.2.3 LOCATE command
    • 10.2.4 READ command
    • 10.2.5 READ BLOCK LIMITS command
    • 10.2.6 READ POSITION command
    • 10.2.7 READ REVERSE command
    • 10.2.8 RECOVER BUFFERED DATA command
    • 10.2.9 RELEASE UNIT command
      • 10.2.9.1 Third-party release
    • 10.2.10 RESERVE UNIT command
      • 10.2.10.1 Third-party reservation
      • 10.2.10.2 Superseding reservations
    • 10.2.11 REWIND command
    • 10.2.12 SPACE command
    • 10.2.13 VERIFY command
    • 10.2.14 WRITE command
    • 10.2.15 WRITE FILEMARKS command
  • 10.3 Parameters for sequential-access devices
    • 10.3.1 Diagnostic parameters
    • 10.3.2 Log parameters
    • 10.3.3 Mode parameters
    • 10.3.3.1 Device configuration page
    • 10.3.3.2 Medium partition page(1)
    • 10.3.3.3 Medium partition page(2-4)
    • 10.3.3.4 Read-write error recovery page
  • 10.4 Definitions specific to sequential access devices
• 11 Commands for printer devices
  • 11.1 Model for printer devices
  • 11.2 Commands for printer devices
    • 11.2.1 FORMAT command
    • 11.2.2 PRINT command
    • 11.2.3 RECOVER BUFFERED DATA command
    • 11.2.4 SLEW AND PRINT command
    • 11.2.5 STOP PRINT command
    • 11.2.6 SYNCHRONIZE BUFFER command
  • 11.3 Parameters for printer devices
  • 11.3.1 Diagnostic parameters
  • 11.3.2 Log parameters
  • 11.3.3 Mode parameters
  • 11.3.3.1 Parallel printer interface page
  • 11.3.3.2 Printer options page
  • 11.3.3.3 Serial printer interface page
• 12 Processor devices
  • 12.1 Model for processor devices
    • 12.1.1 Host-to-host communication, SEND only
    • 12.1.2 Host-to-host communication, SEND and RECEIVE
    • 12.1.3 Host-to-special-output peripheral
    • 12.1.4 Host-to-special-input peripheral
  • 12.2 Commands for processor devices
    • 12.2.1 RECEIVE command
    • 12.2.2 SEND command
  • 12.3 Parameters for processor devices
    • 12.3.1 Diagnostic parameters
    • 12.3.2 Log parameters
  • 12.4 Definitions specific to processor devices
• 13 Write-once devices
  • 13.1 Model for write-once devices
    • 13.1.1 Logical blocks
    • 13.1.2 Initialization
    • 13.1.3 Physical medium defects
    • 13.1.4 Error reporting
  • 13.2 Commands for write-once devices
  • 13.3 Parameters for write-once devices
  • 13.4 Definitions specific to write-once devices
• 14 CD-ROM devices
  • 14.1 Model for CD-ROM devices
    • 14.1.1 CD-ROM media organization
    • 14.1.2 CD-ROM physical data format
      • 14.1.2.1 Frame format for audio
      • 14.1.2.2 Sector format for data
      • 14.1.2.3 Sub-channel information formats
    • 14.1.3 CD Audio error reporting
    • 14.1.4 CD-ROM ready condition/not ready condition
    • 14.1.5 CD-ROM address reporting formats (MSF bit)
    • 14.1.6 Sensing support for CD-audio commands.
    • 14.1.7 Error reporting
  • 14.2 Commands for CD-ROM devices
    • 14.2.1 PAUSE RESUME command
    • 14.2.2 PLAY AUDIO(10) command
    • 14.2.3 PLAY AUDIO(12) command
    • 14.2.4 PLAY AUDIO MSF command
    • 14.2.5 PLAY AUDIO TRACK INDEX command
    • 14.2.6 PLAY AUDIO TRACK RELATIVE(10) command
    • 14.2.7 PLAY AUDIO TRACK RELATIVE(12) command
    • 14.2.8 READ CD-ROM CAPACITY command
    • 14.2.9 READ HEADER command
    • 14.2.10 READ SUB-CHANNEL command
      • 14.2.10.1 Sub-Q channel data format
      • 14.2.10.2 CD-ROM current position data format
      • 14.2.10.3 Media catalogue number data format
      • 14.2.10.4 Track international standard recording code data format
    • 14.2.11 READ TOC command
  • 14.3 Parameters for CD-ROM devices
    • 14.3.1 Diagnostic parameters
    • 14.3.2 Log parameters
    • 14.3.3 Mode parameters
    • 14.3.3.1 CD-ROM audio control parameters
    • 14.3.3.2 CD-ROM device parameters
    • 14.3.3.3 Read error recovery parameters
    • 14.3.3.4 Verify error recovery parameters
  • 14.4 Definitions specific to CD-ROM devices
• 15 Scanner devices
  • 15.1 Model for scanner devices
  • 15.2 Commands for scanner devices
    • 15.2.1 GET DATA BUFFER STATUS command
    • 15.2.2 GET WINDOW command
    • 15.2.3 OBJECT POSITION command
    • 15.2.4 READ command
    • 15.2.5 SCAN command
    • 15.2.6 SEND command
    • 15.2.7 SET WINDOW command
  • 15.3 Parameters for scanner devices
    • 15.3.1 Diagnostic parameters
    • 15.3.2 Log parameters
    • 15.3.3 Mode parameters
    • 15.3.3.1 Measurement units page
  • 15.4 Definitions specific to scanner devices
• 16 Optical memory devices
  • 16.1 Model for optical memory devices
    • 16.1.1 Defect management
    • 16.1.2 Error reporting
  • 16.2 Commands for optical memory devices
    • 16.2.1 ERASE(10) command
    • 16.2.2 ERASE(12) command
    • 16.2.3 MEDIUM SCAN command
    • 16.2.4 READ(12) command
    • 16.2.5 READ DEFECT DATA(12) command
    • 16.2.6 READ GENERATION command
    • 16.2.7 READ UPDATED BLOCK(10) command
    • 16.2.8 SEARCH DATA(12) commands
    • 16.2.9 SET LIMITS(12) command
    • 16.2.10 UPDATE BLOCK command
    • 16.2.11 VERIFY(10) command
    • 16.2.12 VERIFY(12) command
    • 16.2.13 WRITE(10) command
    • 16.2.14 WRITE(12) command
    • 16.2.15 WRITE AND VERIFY(10) command
    • 16.2.16 WRITE AND VERIFY(12) command
  • 16.3 Parameters for optical memory devices
    • 16.3.1 Diagnostic parameters
    • 16.3.2 Log parameters
    • 16.3.3 Mode parameters
    • 16.3.3.1 Optical memory page
  • 16.4 Definitions specific to write-once and optical memory devices
• 17 Medium-changer devices
  • 17.1 Medium-changer device model
    • 17.1.1 Medium-changer elements
      • 17.1.1.1 Medium transport elements
      • 17.1.1.2 Storage elements
      • 17.1.1.3 Import export elements
      • 17.1.1.4 Data transfer element
    • 17.1.2 SCSI addressing of medium changer devices
    • 17.1.3 Data access operations using a medium changer device
    • 17.1.4 Element status maintenance requirements
    • 17.1.5 Volume tags
    • 17.1.5.1 Volume tag format
    • 17.1.5.2 Primary and alternate volume tag information
  • 17.2 Commands for medium changer devices
    • 17.2.1 EXCHANGE MEDIUM command
    • 17.2.2 INITIALIZE ELEMENT STATUS command
    • 17.2.3 MOVE MEDIUM command
    • 17.2.4 POSITION TO ELEMENT command
    • 17.2.5 READ ELEMENT STATUS command
      • 17.2.5.1 Element status data
      • 17.2.5.2 Element status page
      • 17.2.5.3 Medium transport element descriptor
      • 17.2.5.4 Storage element descriptor
      • 17.2.5.5 Import export element descriptor
      • 17.2.5.6 Data transfer element descriptor
    • 17.2.6 REQUEST VOLUME ELEMENT ADDRESS command
    • 17.2.7 RELEASE command
      • 17.2.7.1 Logical unit release
      • 17.2.7.2 Element release (optional)
      • 17.2.7.3 Third party release
    • 17.2.8 RESERVE command
      • 17.2.8.1 Logical unit reservation
      • 17.2.8.2 Element reservation (optional)
      • 17.2.8.3 Third party reservation
      • 17.2.8.4 Superseding reservations
    • 17.2.9 SEND VOLUME TAG command
  • 17.3 Parameters for medium changer devices
    • 17.3.1 Diagnostic parameters
    • 17.3.2 Log parameters
    • 17.3.3 Mode parameters
    • 17.3.3.1 Device capabilities page
    • 17.3.3.2 Element address assignment page
    • 17.3.3.3 Transport geometry parameters page
  • 17.4 Definitions specific to medium changer devices
• 18 Communications devices
  • 18.1 Communications device model
    • 18.1.1 Implementation examples
    • 18.1.1.1 Host-to-host communications
    • 18.1.1.2 Host-to-device communications
    • 18.1.1.3 Multiple role communications
  • 18.2 Command descriptions for communications devices
    • 18.2.1 GET MESSAGE(6) command
    • 18.2.2 GET MESSAGE(10) command
    • 18.2.3 GET MESSAGE(12) command
    • 18.2.4 SEND MESSAGE(6) command
    • 18.2.5 SEND MESSAGE(10) command
    • 18.2.6 SEND MESSAGE(12) command
  • 18.3 Parameters for communication devices
    • 18.3.1 Diagnostic parameters
    • 18.3.2 Log parameters
    • 18.3.3 Mode parameters
  • 18.4 Definitions specific to communications devices
• Index

Annexes

• Annex A SCSI signal sequence example
• Annex B Fast SCSI skew time
• Annex C Other SCSI standardization activities
  • C.1 SCSI-3 standards projects
  • C.2 Digital data exchange for colour electronic prepress systems
  • C.3 Fibre channel
• Annex D Numeric order codes
• Annex E Vendor identification