CD-RW

rewritable CDsCD-MOCDRW/W 737MB=702MiBCD-RW disksCD-RWsPMAProgram Memory Areare-writeable CDRead/Write
CD-RW (Compact Disc-ReWritable) is a digital optical disc storage format introduced in 1997.wikipedia
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Compact disc

CDCDsCD single
A CD-RW compact disc (CD-RWs) can be written, read, erased, and re-written.
Several other formats were further derived from these, including write-once audio and data storage (CD-R), rewritable media (CD-RW), Video Compact Disc (VCD), Super Video Compact Disc (SVCD), Photo CD, PictureCD, Compact Disc-Interactive (CD-i), and Enhanced Music CD.

Optical disc

optical mediaoptical data storageoptical discs
CD-RW (Compact Disc-ReWritable) is a digital optical disc storage format introduced in 1997.
An optical disc is designed to support one of three recording types: read-only (e.g.: CD and CD-ROM), recordable (write-once, e.g. CD-R), or re-recordable (rewritable, e.g. CD-RW).

Optical disc authoring

Optical disc authoring softwareburningburned
Erasure methods include full blanking where the entire surface of the disc is erased and fast blanking where only metadata areas, such as PMA, TOC and pregap, are cleared.
This allows a user to construct a disc incrementally, as it could be on a rewritable medium like a floppy disk or rewritable CD.

CD-R

CDRrecordable CDCD-Rs
Early CD-R media contained a similar compatibility flaw.
This is an advantage over CD-RW, which can be re-written but cannot be played on many plain CD readers.

Rainbow Books

Red BookOrange BookRainbow book
Before CD-RW technology, in 1990 a standard for magneto-optical recordable and erasable CDs called CD-MO was introduced and set in the Orange Book, part 1 as a CD with a magneto-optical recording layer.

Curie temperature

Curie pointbelow −183 °CCurie
Data recording (and erasing) was achieved by heating the magneto-optical layer's material (e.g. DyFeCo or less often TbFeCo or GdFeCo) to its Curie point and then using a magnetic field to write the new data, in a manner essentially identical to Sony's MiniDisc and other magneto-optical formats.
Famous examples include the Sony Minidisc format, as well as the now-obsolete CD-MO format.

AgInSbTe

Ag- and In- doped Sb 2 TeInAgTeSb
The reflective layer is, however, a silver-indium-antimony-tellurium (AgInSbTe) alloy with a polycrystalline structure and reflective properties in its original state.
AgInSbTe, or Silver-Indium-Antimony-Tellurium, is a phase change material from the group of chalcogenide glasses, used in rewritable optical discs (such as rewritable CDs) and phase-change memory applications.

Tellurium

Tenative telluriumtelluride
The reflective layer is, however, a silver-indium-antimony-tellurium (AgInSbTe) alloy with a polycrystalline structure and reflective properties in its original state.
Tellurium, as tellurium suboxide, is used in the media layer of rewritable optical discs, including ReWritable Compact Discs (CD-RW), ReWritable Digital Video Discs (DVD-RW), and ReWritable Blu-ray Discs.

Laser

laserslaser beamlaser light
Unlike a CD-R, a CD-RW has a minimum writing speed under which the discs cannot be recorded, based on the phase change material's heating and cooling time constants and the required laser energy levels.

Digital media

digital editingdigitalonline media
CD-RW (Compact Disc-ReWritable) is a digital optical disc storage format introduced in 1997.

Data storage

data storage devicestoragestorage media
CD-RW (Compact Disc-ReWritable) is a digital optical disc storage format introduced in 1997.

Pregap

pre-gappregap hidden trackby holding rewind at the start of track 1
Erasure methods include full blanking where the entire surface of the disc is erased and fast blanking where only metadata areas, such as PMA, TOC and pregap, are cleared.

Dysprosium

Dy 6 Dy
Data recording (and erasing) was achieved by heating the magneto-optical layer's material (e.g. DyFeCo or less often TbFeCo or GdFeCo) to its Curie point and then using a magnetic field to write the new data, in a manner essentially identical to Sony's MiniDisc and other magneto-optical formats.

Iron

FeFe 2+ Fe(III)
Data recording (and erasing) was achieved by heating the magneto-optical layer's material (e.g. DyFeCo or less often TbFeCo or GdFeCo) to its Curie point and then using a magnetic field to write the new data, in a manner essentially identical to Sony's MiniDisc and other magneto-optical formats.

Cobalt

CoCo 2+ bush sickness
Data recording (and erasing) was achieved by heating the magneto-optical layer's material (e.g. DyFeCo or less often TbFeCo or GdFeCo) to its Curie point and then using a magnetic field to write the new data, in a manner essentially identical to Sony's MiniDisc and other magneto-optical formats.

Terbium

TbTerbium (III)
Data recording (and erasing) was achieved by heating the magneto-optical layer's material (e.g. DyFeCo or less often TbFeCo or GdFeCo) to its Curie point and then using a magnetic field to write the new data, in a manner essentially identical to Sony's MiniDisc and other magneto-optical formats.

Gadolinium

GdGd 3+ contrast
Data recording (and erasing) was achieved by heating the magneto-optical layer's material (e.g. DyFeCo or less often TbFeCo or GdFeCo) to its Curie point and then using a magnetic field to write the new data, in a manner essentially identical to Sony's MiniDisc and other magneto-optical formats.

MiniDisc

MDMini DiscHi-MD
Data recording (and erasing) was achieved by heating the magneto-optical layer's material (e.g. DyFeCo or less often TbFeCo or GdFeCo) to its Curie point and then using a magnetic field to write the new data, in a manner essentially identical to Sony's MiniDisc and other magneto-optical formats.

Magneto-optic Kerr effect

Kerr effectKerr microscopyMOKE
Reading the discs relied on the Kerr effect a major format flaw.

Phase transition

phase transitionsorder parameterphase change
The CD-RW is based on phase change technology, with a degree of reflection at 15–25%, compared to 40–70% for CD-R discs.

Sine wave

sinusoidalsinusoidsine
To maintain a precise rotation speed, tracks have a slight superimposed sinusoidal excursion of 0.3 µm at a frequency of 22.05 kHz.

Frequency modulation

FMfrequency modulatedfrequency-modulated
In addition a 1 kHz frequency modulation is applied to provide the recorder with an absolute time reference.

Silver

Agsilver orenative silver
The reflective layer is, however, a silver-indium-antimony-tellurium (AgInSbTe) alloy with a polycrystalline structure and reflective properties in its original state.

Indium

InIn 2 111 In
The reflective layer is, however, a silver-indium-antimony-tellurium (AgInSbTe) alloy with a polycrystalline structure and reflective properties in its original state.

Antimony

Sbantimonialantimonium
The reflective layer is, however, a silver-indium-antimony-tellurium (AgInSbTe) alloy with a polycrystalline structure and reflective properties in its original state.