Notice: Use of undefined constant letter - assumed 'letter' in /www/hardwaresecrets/dictionary.php on line 3 Notice: Undefined index: letter in /www/hardwaresecrets/dictionary.php on line 3 Notice: Use of undefined constant id - assumed 'id' in /www/hardwaresecrets/dictionary.php on line 6 Notice: Use of undefined constant category - assumed 'category' in /www/hardwaresecrets/dictionary.php on line 8 Notice: Undefined index: category in /www/hardwaresecrets/dictionary.php on line 8 Dictionary | Hardware Secrets
Hardware Secrets
Home | Camera | Case | CE | Cooling | CPU | Input | Memory | Mobile | Motherboard | Networking | Power | Storage | Video | Other
Content
Articles
Editorial
First Look
Gabriel’s Blog
News
Reviews
Tutorials
Main Menu
About Us
Awarded Products
Datasheets
Dictionary
Download
Drivers
Facebook
Links
Manufacturer Finder
Newsletter
RSS Feed
Test Your Skills
Twitter
Newsletter
Subscribe today!


Home » Dictionary » Storage

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z Numeric

CD-RW
Author: Gabriel Torres Last Updated: June 30, 2005
Category: Storage

Media type that can be recorded and re-recorded by end users with a storage capacity of 650 MB, bringing the same level of convenience as floppy disks. Also called CD-E (CD Erasable). CD-RW recording is done through a CD-RW recorder, also known as "CD-RW burner".

The disc is manufactured using a photosensitive material that changes its chemical and physical characteristics accordingly to the temperature. This technology is called phase-change.

CD-RW discs have six layers: the phase-change material uses four layers, on top of them we have a plastic substrate layer and then a lacquer layer. The photosensitive material is made of four chemical elements: silver, antimony, tellurium and indium. The fusion temperature for liquid state is around 600 C and fusion temperature for solid state is around 200 C.

On a CD-RW, the pits and lands found on a regular CD are represented with the physical state of the organic material:

Solid state = translucid = lands
Liquid state = opaque = pits

Since the recording and erasing processes of CD-RW are done using heat, you should avoid letting your discs face light and heat sources, like the sunlight.

In order to read CD-RW discs, CD-ROM units must have a circuit called AGC (Automatic Gain Control). Older CD-ROM units don’t have this circuit, thus they cannot read CD-RW media. This happens because the reflection ratio (the amount of laser light that bounces reflects back after hitting a reflecting point) of CD-RW media is far lower than commercial CDs (”silver“ CDs) and CD-R. While commercial CDs have a reflection ratio of 70% and CD-R 65%, on CD-RW only 20% of the laser light reflects back when it strikes a reflection point.

Related Terms:

Related Links:

Print Version | Send to Friend | Bookmark this Term

There are 369 terms in our database.


RSSLatest Content
ASRock Z97 Anniversary Motherboard
December 16, 2014 - 4:27 AM
Gigabyte H81M-S2PH Motherboard
December 12, 2014 - 3:05 AM
Aerocool Dead Silence Case Review
December 2, 2014 - 3:00 AM
NZXT S340 Case Review
November 27, 2014 - 3:45 AM
AMD A4-5000 CPU Review
November 26, 2014 - 3:10 AM
Samsung Galaxy Note Pro 12.2 Tablet Review
November 25, 2014 - 3:00 AM
ASUS X99-PRO Motherboard
November 5, 2014 - 3:00 AM
ASRock QC5000-ITX Motherboard
November 4, 2014 - 3:00 AM
Gigabyte X99-UD3 Motherboard
October 30, 2014 - 8:30 AM







2004-14, Hardware Secrets, LLC. All rights reserved.
Advertising | Legal Information | Privacy Policy
All times are Pacific Standard Time (PST, GMT -08:00)