| Q: |
What
does DVD mean? |
| A: |
The
keyword is "versatile." Digital Versatile discs provide
superb video, audio and data storage and access -- all on one disc.
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| Q: |
What's
the basic difference between DVD and CD? |
| A: |
DVD
is a high capacity multimedia data storage medium. It can accommodate
a complete movie on a single disc, content rich multimedia or very
high quality multi-channel audio. |
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|
| Q:
|
How
does DVD technology differ from CD? |
| A: |
Like
CDs, DVDs store data in microscopic grooves running in a spiral
around the disc. All DVD drive types use laser beams to scan these
grooves: Minuscule reflective bumps (called lands) and nonreflective
holes (called pits) aligned along the grooves represent the zeros
and ones of digital information. |
| |
But
that's where the similarities end. DVDs use smaller tracks (0.74
microns wide, compared to 1.6 microns on CDs) as well as new modulation
and error correction methods. These technologies allow them to store
data seven times as large as that of a CD. |
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|
|
| Q: |
What
is the market outlook for DVD? |
| A: |
The
market for DVD has grown faster than CD or VHS did in their first
two years in the USA, Europe, and Asia. |
| |
A
recent market research study predicts that DVD will become the standard
home video format, replacing video cassettes within the next five
years. |
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|
| Q: |
Why is
DVD video superior to that of standard videotape?
|
| A: |
DVD
video storage provides resolution which is far greater than that
offered by laser disc media and almost twice the resolution of standard
VHS videotape. |
| |
Resolution
is dependent on the capabilities of the television monitor used,
but you need not have a new monitor to enjoy the benefits of DVD.
DVD video also provides low noise. |
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One
more advantage of a DVD disc is that it is not physically touched
while it spins in the player , so there is no wear and tear or loss
of fidelity over time. In contrast, videotapes do touch a playback
mechanism and can eventually break down, degrading the quality of
picture. |
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|
|
| Q: |
Just
how good is the DVD picture? |
| A: |
Based
upon pixel resolution, color resolution, color detail, black level
production and a virtual lack of color noise, the DVD picture is
nearly 3 times better than conventional VHS. |
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|
|
| Q: |
Will
DVD movies play on my current CD player?
|
| A: |
No,
you will require a DVD player that is equipped to read the pits
and lands of a DVD disc and decode the MPEG-2 data signal. |
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|
|
| Q: |
Will
DVD discs wear out, like VHS movies?
|
| A: |
No.
The picture quality of the DVD disc is consistent from the first
play to the thousandth play. Plus, DVD discs will not deteriorate
over time, are unaffected by magnetic fields (which can literally
erase a VHS cassette) and do not require rewinding after viewing.
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|
| Q: |
Can I
play CDs on my DVD player? |
| A: |
Most
DVD hardware will play audio CDs and CD-ROMs. The physical dimensions
are identical to compact discs. But you should check with your DVD
brand's dealer to confirm compatibility with CDs. |
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|
|
| Q: |
How do
the various DVD formats differ?
|
| A: |
DVD
Video |
| |
For viewing
movies and other visual entertainment. The total capacity is 17
gigabytes if two layers on both sides of the disk are utilized.
DVD-ROM
Its basic technology is the same as DVD Video, but it also includes
computer-friendly file formats. It is used to store data. This
product should supplant conventional CD-ROMs in the near future.
DVD Audio
The latest audio format more than doubles the fidelity of a standard
CD. It is expected to become the most popular audio disk.
DVD-RAM
This makes DVD a virtual hard disk, with a random read-write access.
Originally a 2.6-gigabyte drive, its capacity has increased to
4.7-gigabyte-per-side. It can be re-written more than 100,000
times.
DVD-RW
Similar to DVD-RAM except that its technology features a sequential
read-write access more like a phonograph than a hard disk. Its
read-write capacity is 4.7 gigabytes per side. It can be re-written
about 1,000 times.
DVD-R
Its capacity is 4.7 gigabytes. Originally designed for professional
authoring, a version for general consumer use is now under development.
As with CD-R, users can write only once to this disk.
DVD+RW*
This media is supported by Philips. Originally it was a 3.0-gigabytes
media. Its capacity has increased to 4.7-gigabyte-per-side. It
can be re-written more than 1,000 times.
|
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|
|
| Q: |
Why are
there three overwrite standards (DVD-RAM, DVD-RW, DVD+RW) ? |
| A: |
The
DVD-RAM/+RW standard was developed as a convergence medium to meet
the requirements of
the computing, AV, and entertainment industries. Recently the designation
DVD+RW was to be modified to DVD-RW. DVD-RW was developed
initially to meet the "work in progress" needs of the
content developers and various streaming data applications.
DVD-RAM
* Random access read/write, just as with a hard drive.
* Comprehensive Defect Sector Management(DSM) support to
ensure randomly written data is only placed in usable areas of the
media and that data is accurately recovered during the read, write
processes.
*100,000 rewrite cycles.
DVD-RW/+RW
* Sequential re-recording in a streaming fashion, similar
to tape.
* 1,000 rewrite cycles for write, test, modify, re-record
applications. |
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|
|
| Q: |
What
is the difference between (DVD-Ram DVD-RW, DVD-R, DVD+RW)? |
| A: |
|
|
| |
DVD-RAM
|
DVD-RW
|
DVD+RW
|
DVD-R(General)
|
CD-RW(8X)
|
CD-R(16X)
|
|
Capacity/Sided
|
4.7GB
|
650MB
|
|
Wave
length(N/A)
|
650nm
(0.6)
|
650nm
(0.6)
|
655nm
(0.65)
|
650nm
(0.6)
|
780nm
(0.45)
|
|
Media
type
|
Phase
Change
|
Dye
|
Phase
Change
|
Dye
|
|
Recording
speed(KB/s)
|
2700
|
1350
|
-----
|
1350
|
1200
|
2400
|
|
Recording
Method
|
Land/Groove
|
Groove
|
Groove
|
Groove
|
Groove
|
Groove
|
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Format
|
ZCLV
|
CLV
|
CLV/CAV
|
CLV
|
CLV
|
CLV
|
|
Recording
Method
|
Random
|
Random
Sequential
|
Random
Sequential
|
Sequential
|
Random
Sequential
|
Sequential
|
|
Finalization
|
Without
|
With
|
With
|
With
|
With
|
With
|
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Defect Management
|
Yes
|
No
|
No
|
No
|
No
|
No
|
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Cartridge
|
Selectable
|
No
|
No
|
No
|
No
|
No
|
|
Cyclability
|
100,000 times
|
1,000 times
|
1,000
times
|
Once
|
1,000
times
|
Once
|
|
8cm
specification
|
Yes
|
Yes
|
-----
|
Yes
|
Yes
|
Yes
|
|
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|
|
| Q: |
What
is the difference between DVD-RW Ver1.1 and Ver1.0 ? |
| A: |
|
|
| |
Ver.
1.0
|
Ver.
1.1
|
|
Recording
Wavelength
|
635/650nm
|
650nm
|
|
Copy
Protection System
|
Without
|
With
CPRM
|
|
Recording
Mode
|
Recording
File
|
Recording
File
|
Video
File
|
|
Compatible
with Player
|
Incompatible
|
Incompatible
|
Compatible
|
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