ISO/IEC 14776-381:2000

Information technology - Small Computer System Interface (SCSI) - Part 381: Optical Memory Card device commands (OMC)

The SCSI command set is designed to provide efficient peer-to-peer operation of input/output devices (disks, tapes, printers, etc.) by an operating system. The SCSI command set assumes a command-response protocol. Action on SCSI commands shall not be deemed completed until a response is received. The response shall include a status that indicates the final disposition of the command. The SCSI command set provides multiple operating systems concurrent control over one or more input/ output devices. The SCSI-3 Optical Memory Card (OMC) command set specifies the commands for a device that declares itself as an optical memory card device in the device type field of the INQUIRY command. The OMC command set is specified independently of any service delivery subsystem; an underlying command-response protocol is assumed. This standard defines the device model for the optical memory card devices.

General Information

• Status: Published
• Publication Date: 08-Jun-2000
• ICS: 01 - GENERALITIES. TERMINOLOGY. STANDARDIZATION. DOCUMENTATION
• ICS: 35.200 - Interface and interconnection equipment
• Technical Committee: ISO/IEC JTC 1/SC 25 - Interconnection of information technology equipment
• Current Stage: PPUB - Publication issued
• Start Date: 31-Jul-2000
• Completion Date: 06-Jun-2000

Standards Content (Sample)

INTERNATIONAL ISO/IEC
STANDARD
14776-381
First edition
2000-06
Information technology –
Small computer system interface (SCSI) –
Part 381:
Optical Memory Card Device Commands (OMC)
Reference number
INTERNATIONAL ISO/IEC
STANDARD
14776-381
First edition
2000-06
Information technology –
Small computer system interface (SCSI) –
Part 381:
Optical Memory Card Device Commands (OMC)
 ISO/IEC 2000
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CONTENTS
Page
FOREWORD.3
INTRODUCTION.4
Clause
1 Scope.5
2 Normative references .5
3 Definitions, symbols and conventions .5
3.1 Definitions .5
3.2 References to SCSI Standards .6
3.3 Symbols and abbreviations.7
3.4 Numerical conventions .7
4 Optical memory card devices.7
4.1 Model for optical memory card devices .7
4.2 Address type .7
4.3 Ready state .8
4.4 Initialisation .8
4.5 Medium defects .8
4.6 Error reporting .8
5 Commands for optical memory card devices .9
5.1 READ CARD CAPACITY command .10
6 Parameters for optical memory card devices.12
6.1 Diagnostic parameters.12
6.2 Log parameters .12
6.3 Mode parameters .13

14776-381 © ISO/IEC:2000(E) – 3 –
INFORMATION TECHNOLOGY –
SMALL COMPUTER SYSTEM INTERFACE (SCSI) –
Part 381: Optical Memory Card Device Commands (OMC)
FOREWORD
ISO (the International Organization for Standardization) and IEC (the International Electrotechnical Commission)
form the specialized system for worldwide standardization. National bodies that are members of ISO or IEC
participate in the development of International Standards through technical committees established by the
respective organization to deal with particular fields of technical activity. ISO and IEC technical committees
collaborate in fields of mutual interest. Other international organizations, governmental and non-governmental, in
liaison with ISO and IEC, also take part in the work.
In the field of information technology, ISO and IEC have established a joint technical committee, ISO/IEC JTC 1.
Draft International Standards adopted by the joint technical committee are circulated to national bodies for voting.
Publication as an International Standard requires approval by at least 75 % of the national bodies casting a vote.
Attention is drawn to the possibility that some of the elements of this International Standard may be the subject of
patent rights. ISO and IEC shall not be held responsible for identifying any or all such patent rights.
International Standard ISO/IEC 14776-381 was prepared by subcommittee 25: Interconnection of
information technology equipment, of ISO/IEC joint technical committee 1: Information technology.
International Standards are drafted in accordance with ISO/IEC Directives, Part 3.

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INTRODUCTION
The SCSI-3 Optical Memory Card (OMC) command set specifies the commands for a device
that declares itself as an optical memory card device in the device type field of the INQUIRY
command. The OMC command set is specified independently of any service delivery
subsystem, an underlying command-response protocol is assumed.
The optical memory card is a Write Once media in that a written area cannot be overwritten.
Information stored on an optical memory card is non-volatile. The media is preformatted
during manufacture and cannot be formatted by the user. The specification for the
preformatted area is defined in ISO/IEC 11694, part 4. Data written to the optical memory
card cannot be updated. Therefore the update commands are not defined for optical memory
card devices.
This standard defines the device model for the optical memory card devices.
This standard is divided into six clauses:
Clause 1 is the scope.
Clause 2 lists the normative references that apply to this standard.
Clause 3 describes the definitions, symbols and abbreviations used in this standard.
Clause 4 describes models for optical memory card devices.
Clause 5 provides the definitions of all commands unique to optical memory card devices.
This clause also provides references to the ISO/IEC 14776-311 SCSI-3 SPC
standard for primary commands and the ISO/IEC 14776-321 SCSI-3 SBC
standard for block commands used with optical memory card device class.
Clause 6 provides the definition of all parameters unique to optical memory card devices.

14776-381 © ISO/IEC:2000(E) – 5 –
INFORMATION TECHNOLOGY –
SMALL COMPUTER SYSTEM INTERFACE (SCSI) –
Part 381: Optical Memory Card Device Commands (OMC)
1 Scope
This standard defines the command set extensions to facilitate operation of optical memory
card devices. The clause(s) of this standard pertaining to optical memory card device class,
implemented in conjunction with the applicable clauses of the ISO/IEC 14776-311 SCSI-3
Primary Commands (SPC) and the ISO/IEC 14776-321 SCSI-3 Block Commands (SBC), fully
specify the standard command set for optical memory card devices.
2 Normative references
The following normative documents contain provisions which, through reference in this text,
constitute provisions of this part of ISO/IEC 14776. For dated references, subsequent
amendments to, or revisions of, any of these publications do not apply. However, parties to
agreements based on this part of ISO/IEC 14776 are encouraged to investigate the possibility
of applying the most recent editions of the normative documents indicated below. For undated
references, the latest edition of the normative document referred to applies. Members of ISO
and IEC maintain registers of currently valid International Standards.
ISO/IEC 7810:1995, Identification cards – Physical characteristics
ISO/IEC 9316:1995, Information technology – Small Computer System Interface-2
ISO/IEC 11694-4:1996, Identification cards – Optical memory cards – Linear recording
method – Part 4: Logical data structures
ISO/IEC CD 14776-311, Information technology – Small Computer System Interface –
1)
Part 311: Primary Commands (SCSI-3 SPC)
ISO/IEC CD 14776-321, Information technology – Small Computer System Interface –
1)
Part 321: Block Commands (SCSI-3 SBC)
3 Definitions, symbols and conventions
3.1 Definitions
For purposes of this standard, the following definitions apply.
3.1.1
address type
addressing methods for optical memory card devices, see 4.2
3.1.2
device-specific
Something (e.g., a bit, field, code value, etc.) that is not defined by this standard and may be
defined differently for each device.
___________
1)
Under consideration.
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3.1.3
ID-1 card
card whose size is defined in ISO/IEC 7810
3.1.4
invalid
illegal or unsupported bit, byte, word, field or code value
3.1.5
mandatory
The referenced item is required to claim compliance with this International Standard.
3.1.6
obsolete
The referenced item was defined in prior SCSI standards but has been removed from this
International Standard.
3.1.7
optional
The referenced item is not required to claim compliance with this International Standard.
Implementation of an optional item must be as defined in this International Standard.
3.1.8
partition
the entire usable region for recording and reading in a recording medium or in a portion of a
recording medium. If there is more than one partition, they shall be numbered starting with
zero
3.1.9
reserved
identifies bits, bytes, words, fields and code values that are set aside for future
standardisation
3.1.10
sector
the minimum unit of data that can be accessed on a recording medium for any read and/or
write commands
3.1.11
type of sector
an identifier which distinguishes the kind of sectors defined in ISO/IEC 11694-4
3.1.12
vendor-specific
Something (e.g. a bit, field, code value, etc.) that is not defined by this standard and may be
used differently in various implementations by each vendor.
3.2 References to SCSI Standards
The term SCSI is used wherever it is not necessary to distinguish between the versions
of SCSI. The Small Computer System Interface-2 (ISO/IEC 9316) is referred to herein as
SCSI-2. The set of SCSI-3 standards are collectively referred to as SCSI-3.

14776-381 © ISO/IEC:2000(E) – 7 –
3.3 Symbols and abbreviations
SBC: SCSI-3 Block Commands standard
SCSI: Either SCSI-2 or SCSI-3
SCSI-2: Small Computer System Interface-2
SCSI-3: Small Computer System Interface-3
SPC: SCSI-3 Primary Commands standard
3.4 Numerical conventions
Digits 0 to 9 in the text of this standard that are not immediately followed by lower-case "h"
are decimal values. Digits 0 to 9 and upper case letter "A" to "F" immediately followed by
lower-case "h" are hexadecimal values.
4 Optical memory card devices
4.1 Model for optical memory card devices
An optical memory card device is a device that returns 0Fh in the PERIPHERAL DEVICE
TYPE field of the INQUIRY command response data.
An optical memory card device is a device that supports an ID-1 card size removable optical
recording medium. In several respects, an optical memory card device is similar to a direct-
access device and an optical memory device.
A sector is the minimum data recording/reproduction unit for optical memory card devices.
Optical memory card devices use variable size sectors to optimize storage performance on
the medium.
4.2 Address type
There are two address types for optical memory card devices. Address type specifies the
value in the logical block address field of the medium access commands and the sense data
information field.
If the device supports both address types, the address types can be selected using the MODE
SELECT command by setting the address type (AT) bit of the optical memory card device
mode parameter header (see SCSI-3 SPC). If the device supports only one address type, the
AT bit is a read-only bit and cannot be changed by the MODE SELECT command. In this
case, the device specific default address type will be used. The current operating address
type of the device can be obtained using the MODE SENSE command.
If the AT bit of mode parameter header is set to zero, the value in the logical block address
field of the medium access commands and the sense data information field consist of the
partition number and the logical block address in the partition as shown in Table 1.
Table 1 – Logical block address field and information field (AT = 0)
Bit 7 654 321 0
Byte
n Partition number
n+1 (MSB) Logical block address in the partition
n+2
n+3 (LSB)
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If the AT bit is set to one, the value in the logical block address field of the medium access
commands and the sense data information field consist of the type of sector, the track
address and the sector address as shown in Table 2.
Table 2 – Logical block address field and information field (AT = 1)
Bit 7 6 5 432 1 0
Byte
n Type of sector
n+1 (MSB) Track address
n+2 (LSB)
n+3 Sector address
NOTE The commands using the logical block address field for optical memory card devices are the following
commands: READ(10), SEEK(10), WRITE(10), WRITE AND VERIFY, and READ CARD CAPACITY command.
4.3 Ready state
The conditions to determine logical unit ready is vendor specific. However, ready state means
that the logical unit would accept an appropriate medium access command without returning
CHECK CONDITION status, and at least both of the following two conditions shall be
satisfied:
1) medium in accordance with a logical unit shall be loaded in a logical unit;
2) basic information (e.g. specific track) in a medium shall be sensed.
4.4 Initialisation
The command for medium initialisation is not defined for optical memory card devices.
4.5 Medium defects
The raw defect rate is typically higher for optical medium than magnetic medium. Data is
usually recovered though the use of sophisticated error correction algorithms. The level of
error correction used for data recovery can be selected. Control of the error correction
algorithms and level of correction depends on the type of sector.
4.6 Error reporting
If any of the following conditions occur during the execution of a command the target shall
return CHECK CONDITION status. The appropriate sense key and additional sense code
should be set. The following list illustrates some error conditions and t
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