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Product Nous
CD：CD Disk is a media which
can store a large amount of date.Its diameter is 1200mm or so,
thickness 1.2mm,which can contain 650M data bytes.All disks
according stemper were made under pressure,but all information
works were recorded on the disk base made from the PC.The trail
of digital recorded is a spiral shape,the trail radiates to
the outside from the center.Outside disk has many pits that
is recorded, digital intormation.Twist data is spanned on the
disk by the laser.On accordance with reflection change on the
disk gets the digital information.Twist can be returned to the
original condition.For example,recordable data video,audio,picture
and sound through according rush pith.With the development of
technique,DVD deputed,which can store a large amount of information.Now,
it can reach as high as 9400 trillion bytes.
DVD：It once meaned digital video disk or digital multi-use
disk.Now it stands for DVD and best light preserved technique.Actually,DVD
is much larger containing and faster than CD.It can preserve
film programme(sound is better than CD and picture is better
than VCD's) and computer data.Many main electronic firm and
computer disk firm and movie music office support DVD form.
So DVD has become the best electronic products in a short time
since it appeared.
CD-R： CD-R is the short form of CD-Recordable.It means:Blank
recordable opitical Disk .The recordable optical Disk may mean
it can record at once disks that can be read from time to time.Its
outside size is the same as CD Disk,with diameter 120mm, and
thickness 1.2mm.It is as convenient and reliable as the standard
CD disks in daily life.Compared with other optical medium,the
advantage of CD-R is that it can not only read in the CD disk's
broadcast.Player or disk drive, but also record conveniently.
The data that the users want to store.And its disadvantage is
that can only record at once,but can't store the data constantly.Then
the following product:CD-RW(CD-Rewrightable) allows users to
omit the information in the disk and use it from time to time.
However,CD-RW disk can't ensure being used in all CD broadcast
playes and disk drives CD-RW drive that is record which can
read not only CD-RW disks but also CD-Rodisks,and also can read
all CD disks as the standard CD disk drive.
Blank recordable DVD disks：Recordable DVD disks as we call
it DVD-R( DVD Recordable) as the CD-R is the rind of disk that
can record at a time,Readable disks constantly. Its outside
size is the same as DVD disks, it is made up of two 0.6mm pieces,diameter
is 120mm. Though its outside size is as same as DVD disks,record
amount of CD-R can't match it. But the single data can reach
4.7GB which is the same as DVD disks.It can record media data
of high cleanness, high quality and large amount. Though the
people in the same area all consider it can record the development
direction of muti-media,however,patent belongs to different
places,that is DVD-R disk divided into two different areas,
one is DVD-R group represented by Pioneer(Read as DVD-R),the
other is DVD+R group, represented by Sony and Philips (Read
as DVD+R). The two forms are not different foundamentally. They
all claim they can be conpatable with the existing DVD record
and record by the laser with 650mm wave and double line velocity
(3149m/s).The different is the DVD-R's mother need mother record
with double lights to produce,which DVD+R Mother uses. Mother
record to record simutanious and founding address wobble groove.
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