Arrangement of data on a CD-ROM
-
3 -
- a unique Physical Address for each recorded sector;
- the location of the Data Field within each sector;
- the length of the Data Field within each sector.
NOTE 3
The standard for recording used in conjunction with this Standard is subject to agreement between the originator
and the recipient of the volumes.
4.16 user
A person or other entity (for example, an application program) that causes the invocation of the services provided
by an implementation.
4.17 volume
A dismountable CD-ROM.
4.18 Volume
Set
A collection of one or more volumes, on which a set of files is recorded.
5 Notation
The following notation is used in this Standard.
5.1
Decimal and hexadecimal notations
Numbers in decimal notation are represented by decimal digits, namely 0 to 9.
Numbers in hexadecimal notation are represented by hexadecimal digits, namely 0 to 9 and A to F, shown in
parentheses.
5.2 Other
notation
BP
Byte position within a descriptor, starting with 1
RBP
Byte position within a descriptor field, starting with 1
ZERO
A single bit with the value 0
ONE
A single bit with the value 1
Digit(s)
Any digit from DIGIT ZERO to DIGIT NINE
Section II: Requirements for the medium
6 Volume
structure
6.1
Arrangement of data on a CD-ROM
6.1.1 Physical
Addresses
Each sector shall be identified by a unique Physical Address as specified in the relevant standard for recording.
6.1.2 Logical
Sector
The sectors of a volume shall be organized into Logical Sectors. Each Logical Sector shall consist of a number
of bytes equal to 2048 or 2^n, whichever is larger, where n is the largest integer such that 2^n is less than, or
equal to, the number of bytes in the Data Field of any sector recorded on the volume. The number of bytes in a
Logical Sector shall be referred to as the Logical Sector size. Each Logical Sector shall begin in a different
sector from any other Logical Sector, and shall begin with the first byte of the Data Field of the sector in which
it begins. If the number of bytes of the Data Field of each sector recorded on the volume is less than 2048, a
Logical Sector shall comprise more than one sector, and the set of the Physical Addresses of its constituent
sectors shall form a consecutive ascending sequence. The data of a Logical Sector shall be recorded in the Data
Fields of its constituent sectors.
Each Logical Sector shall be identified by a unique Logical Sector Number. Logical Sector Numbers shall be
integers assigned in an ascending sequence, in order of ascending Physical Addresses of the constituent sectors,
