Constant linear velocity

• constant linear velocity

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CD-ROM - Transfer rates

1 CAV drives give speeds up to 30× at the outer edge of the disc with the

same rotational speed as a standard constant linear velocity (CLV) 12×, or

32× with a slight increase


Optical disc - First-generation

1 Other factors that affect data storage density include: the existence of

multiple layers of data on the disc, the method of rotation (Constant

linear velocity (CLV), Constant angular velocity (CAV), or zoned-

CAV), the composition of lands and pits, and how much margin is unused is at the center and the edge of the

disc.https://store.theartofservice.com/the-constant-linear-velocity-toolkit.html

Compact Disc - Physical details

1 Scanning velocity is 1.2–1.4m/s (constant linear velocity)– equivalent

to approximately 500 rpm at the inside of the disc, and approximately 200 rpm at the outside edge. (A disc played from beginning to end slows

down during playback.)


Data transfer rate (disk drive) - Rotational latency

1 The spindle motor speed can use one of two types of disk rotation methods: 1) constant linear velocity (CLV), used mainly in optical storage, varies the rotational speed of the optical disc depending upon the position of the head, and 2) constant angular velocity (CAV), used in HDDs, standard FDDs, a few

optical disc systems, and Gramophone record|vinyl audio records, spins the media at one constant speed regardless of where the

head is positioned.https://store.theartofservice.com/the-constant-linear-velocity-toolkit.html

Optical disc drive - Rotational mechanism

1 This led to optical drives—until recently—operating with a constant linear velocity (CLV)


Optical disc drive - Rotational mechanism

1 This divides the disc into several zones, each having its own constant linear velocity


Optical disc drive - Recording performance

1 Although later interfaces were able to stream data at the required speed,

many drives now write in a 'zoned constant linear velocity'


GD-ROM - Technical information

1 Very old CD-ROM drives read with a constant linear velocity (CLV) design,

however (usually 12x or slower)


LaserDisc - Design

1 ; CLV: Constant linear velocity or Extended Play discs do not have the trick play features of CAV, offering only simple playback on all but the

high-end LaserDisc players incorporating a digital frame store


LaserDisc - Design

1 Constant Angular Acceleration is very similar to Constant Linear Velocity,

save for the fact that CAA varies the angular rotation of the disc in

controlled steps instead of gradually slowing down in a steady linear pace

as a CLV disc is read


CD-R - Speed

1 Also, above 20× speed, drives use a Constant linear velocity#Zoned Constant Linear

Velocity|Zoned-CLV or CAV strategy, where the advertised maximum speed is only reached

near the outer rim of the disc. This is not taken into account by the above table. (If this were not done, the faster rotation that would be required at the inner tracks could cause

the disc to fracture and/or could cause excessive vibration which would make

accurate and successful writing impossible.)https://store.theartofservice.com/the-constant-linear-velocity-toolkit.html

DVD-R - Speed

1 The write time may vary (± 30 s) between writer and media used. For

high speed, the write strategy changes from constant linear velocity

(CLV) to constant angular velocity (CAV), or zoned constant linear

velocity (ZCLV). The table below largely assumes CAV.


LD-ROM

1 LD-ROMs owe their greater capacity to a design for constant linear velocity (CLV) playback. Like

magnetic tape, the playback speed corresponds with picture quality and

audio definition of analog audio-video streams. Since Pioneer

intended LD-ROMs primarily for computer software, they chose CLV

technology to increase the file storage capacity.https://store.theartofservice.com/the-constant-linear-velocity-toolkit.html

Phonograph - Disc versus cylinder as a recording medium

1 Recordings made on a cylinder remain at a constant linear velocity

for the entirety of the recording, while those made on a disc have a higher linear velocity at the outer portion of the groove compared to

the inner portion.


Inertia

1 In other words, it is the tendency of objects to keep moving in a straight

line at constant linear velocity


Charles Sumner Tainter - Patents

1 * Recording and Reproducing Speech and Other Sounds (improvements

include compliant cutting head, wax surface, and constant linear velocity

disk), filed June 1885, issued May 1886 (with Chichester Bell)


Disk drive - Rotation speed and track layout

1 *constant linear velocity (used mainly in optical storage) varies the rotational speed of the optical disc depending upon the position of the

head, and


Disk drive - Basic terminology

1 **Constant linear velocity (CLV) keeps the distance covered by the heads per unit time fixed. Thus the disk has to slow down as the arm moves to the outer tracks. This method is typical for CD drives.


Gramophone record - The 'Shellac' era

1 At least one manufacturer in the early 1920s, World Records,

produced records that played at a constant linear velocity, controlled by

Noel Pemberton Billing's patented add-on governor device


Constant angular velocity

1 In optical storage, 'constant angular velocity' ('CAV') is a qualifier for the rated speed of an optical disc drive,

and may also be applied to the writing speed of recordable optical disc|discs. A drive or disc operating in CAV mode maintains a constant angular velocity, contrasted with a

constant linear velocity (CLV).https://store.theartofservice.com/the-constant-linear-velocity-toolkit.html

8-track tape - Introduction of Stereo 8

1 With a reel turning at a constant rate, the tape around the hub has a lower

constant linear velocity|linear velocity than the tape at the outside of the reel, so the tape layers must

slip past each other as they approach the center


LP record - Groove

1 It travels fastest on the outside edge, unlike audio CDs, which change their speed of rotation to provide constant

linear velocity (CLV)


Ghostbusters - Home media

1 In 1989, Criterion Collection released a LaserDisc version of the film, in a

one-disc Constant linear velocity|CLV version and a two-disc special edition

Constant angular velocity|CAV version


Constant linear velocity

1 In optical storage, 'constant linear velocity' ('CLV') is a qualifier for the rated speed of an optical disc drive, and may also be applied to the writing speed of recordable optical disc|discs. CLV implies that the angular velocity

(i.e. revolutions per minute|rpm) varies during an operation, as contrasted with constant

angular velocity|CAV modes. The concept of constant linear velocity was patented in 1886 by phonograph pioneers Chichester Bell and

Charles Tainter.https://store.theartofservice.com/the-constant-linear-velocity-toolkit.html

Constant linear velocity

1 Laserdiscs, the first consumer optical discs, used constant linear velocity to double playback time (CLV disc can hold 1 hour per side; CAV disc only 30 minutes). As the motor's speed decreases from 1,800 to 600 rpm when the read head moves away

from the center (which is the start of the recording), the disc constantly

moves past the read head at .https://store.theartofservice.com/the-constant-linear-velocity-toolkit.html

Constant linear velocity - Zoned Constant Linear Velocity

1 Some high-speed recorders use the zoned CLV method (ZCLV), which

divides the disc into stepped zones, each of which has its own constant

linear velocity


The Ghosts of Versailles - Recordings

1 Up until recently, the only recordings were a VHS of a televised production presented by the Metropolitan Opera

in 1992 and a Constant Linear Velocity (CLV) LaserDisc of the same

performance


Wild Palms - Home media releases

1 It was released on Constant linear velocity|CLV laserdisc in the U.S


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Constant linear velocity