ISO/IEC 30193:2020 情報技術—情報交換および保管用のデジタル記録メディア— 120 mmトリプルレイヤー（ディスクあたり100,0ギガバイト）BD書き換え可能ディスク | ページ 6

3.1

BD

disk having a cover layer (3.4) around 0,1 mm thick and a substrate (3.43) around 1,1 mm thick on which data is read or recorded by an optical pick-up unit (OPU) using 405 nm laser diode and numerical aperture, NA = 0,85 lens

Note 1 to entry: User data recorded on a disk is formatted using 17PP modulation and an LDC+BIS Code.

3.2

BD application

BDAP

contents standard specified for a BD (3.1) , for instance a video application, which requires area for a content-protection system and for its own defect-management system on the disk

3.3

channel bit

element by which the binary value ZERO or ONE is represented by pits (3.27) / marks (3.19) and spaces (3.42) on a disk

3.4

cover layer

transparent layer with precisely controlled optical properties that covers the recording layer (3.33) closest to the entrance surface of a disk

3.5

data zone n

area between the inner zone and the outer zone on layer Ln (3.17)

3.6

defective cluster

cluster in a user-data area (3.47) that has been registered in a defect list as unreliable or uncorrectable one

3.7

digital-sum value

DSV

arithmetic sum obtained from a bit stream by assigning the decimal value +1 to channel bits (3.3) set to ONE and the decimal value −1 to channel bits set to ZERO

3.8

disk reference plane

plane defined by the perfect flat annular surface of an ideal spindle, onto which the clamping zone of a disk is clamped, that is normal to the axis of rotation

3.9

embossed HFM area

area on a disk where information has been stored by means of an HFM groove (3.13) during manufacturing of the disk

3.10

entrance surface

surface of a disk onto which the optical beam first impinges

3.11

erased groove

blank groove (3.12) on a disk that has been erased by irradiating the track (3.44) using only erase power level, P_eo, as determined by the OPC algorithm

3.12

groove

trench-like feature of a disk connected to a recording layer (3.33)

3.13

high-frequency modulated groove

HFM groove

groove (3.12) modulated in the radial direction with a rather high bandwidth signal

Note 1 to entry: HFM groove creates a data channel with sufficient capacity and data rate for replicated information.

3.14

information area

area on a disk in which information can be recorded

3.15

information zone

recorded part of the information area (3.14)

3.16

land

surface of a recording layer (3.33) between successive windings of a groove (3.12)

3.17

layer Ln

one recording layer (3.33) of a disk identified by n

Note 1 to entry: layer L(n+1) is closer to the entrance surface (3.10) of a disk than layer Ln.

3.18

layer type

identification of a disk using number of layer(s)

Note 1 to entry: In case of triple-layer disk, the layer type is TL (see Clause 7).

3.19

mark

feature of a recording layer (3.33) , which can take the form of an amorphous domain in the crystalline recording stack due to recording, that can be sensed by an optical read-out system

Note 1 to entry: The pattern of marks and spaces (3.42) represents the data on a disk.

3.20

mark polarity

polarity of reflectivity change when marks (3.19) are recorded

3.21

measurement velocity

linear velocity at which a disk is measured during reading

Note 1 to entry: The nx measurement velocity means the measurement velocity of n times the reference velocity (3.36) .

3.22

modulation bit

alternative form representing the data, that is more suited to be transmitted via a communication channel or to be stored on a storage system

3.23

NRZI conversion

method of converting modulation-bit stream into a physical signal

3.24

on-groove

geometry where grooves (3.12) are nearer to the entrance surface (3.10) of a disk than the lands (3.16)

3.25

padding

process in a drive to fill up the missing sectors in a 64K cluster, which consists of 32 sectors (3.40) , with all 00h data when the host supplies less than the 32 sectors and needs to fill up the cluster

3.26

phase change

physical effect by which an area of a recording layer (3.33) is irradiated by a laser beam and heated so as to change from a crystalline state to an amorphous state and vice versa

3.27

pit

feature of a recording layer (3.33) , which can take the form of a depression in or elevation on the land (3.16) surface, that can be sensed by the optical read-out system

Note 1 to entry: The pattern of pits and spaces (3.42) represents the data on a disk.

3.28

polarization

direction of the electric field vector of an optical beam

Note 1 to entry: The plane of polarization is the plane containing the electric field vector and the direction of propagation of the beam.

3.29

pre-recorded area

area on a disk where information has been recorded by the manufacturer/supplier of the disk by applying standard recording techniques after finishing of the replication process

3.30

protective coating

optional additional layer on top of the cover layer (3.4) provided for extra protection against scratches and other types of damage

3.31

reading velocity

linear velocity at which a disk is actually read

Note 1 to entry: The nx reading velocity means the reading velocity of n times the reference velocity (3.36) .

3.32

read-modify-write

process in a drive to read full content of a 64K cluster, which consists of 32 sectors (3.40) , replace the sector(s) concerned and write back the full cluster to a disk when one or more, but less than 32, sector(s) in a cluster is(are) rewritten

3.33

recording layer

part of a disk consisting of a stack of films of specific materials on or in which data is written during manufacture and/or use

3.34

reference servo

servomechanism of a reference drive with parameters defined for measuring disks

3.35

recording velocity

linear velocity at which a disk is recorded

Note 1 to entry: The nx recordingvelocity means the recording velocity of n times the reference velocity (3.36) .

3.36

reference velocity

linear velocity that results in the nominal channel-bit rate of 66 000 Mbit/s

3.37

reserved

<value> value(s) not used in this document

3.38

reserved

<field> field(s) not specified in use, to be ignored in interchange and to be set to ZERO as value

3.39

rewritable area

area on a disk where information can be recorded by means of marks (3.19) and spaces (3.42) using the phase-change effect and during the manufacture and/or use of the disk

3.40

sector

minimum-size addressable data part of a track (3.44) in the information zone (3.15)

3.41

spacer layer

transparent layer with precisely-controlled optical properties separating two recording layers (3.33)

3.42

space

area separating pits (3.27) or marks (3.19) in the tangential direction in the context of HF signals

Note 1 to entry: The pattern of pits (3.27) / marks (3.19) and spaces represents the data on a disk.

3.43

substrate

layer, which can be transparent or not, provided for the mechanical support of a recording layer (3.33)

3.44

track

360° turn of a continuous spiral, formed by a groove (3.12)

3.45

track pitch

distance between centrelines of a groove (3.12) , in adjacent tracks (3.44) , measured in the radial direction

3.46

transmission stack

set of all layers between the entrance surface (3.10) of a disk and the recording layer (3.33) concerned

Note 1 to entry: In other words, the transmission stack of a specific recording layer consists of all layers that are passed through by the light beam, when accessing that recording layer.

3.47

user-data area

collection of all data zone(s) on a disk, consisting only of the clusters in which user data can be recorded

3.48

virgin groove

blank groove (3.12) on a disk which has never been recorded nor erased

3.49

wobbled groove

groove (3.12) that has a periodic sinusoidal deviation from its average centreline

Note 1 to entry: By modulating the sinusoidal deviation, the wobble provides address information and general information about a disk.

3.50

zone

annular area of a disk