| Q: |
Is a
cartridge necessary for DVD-RAM ? |
| A: |
No,
Singled-sided 4.7GB DVD-RAM media is available as both a bare disc
or in removable cartridge from multiple sources. The removable media
cartridge can be thought of in the same manner s a tape cartridge
or CD jewel case. For media/data protection, storage, archiving
or shipment. In the many large DVD library applications where media
is seldom handled, bare double-sided 9.4GB media is often used. |
|
|
|
| Q: |
How many
types does DVD-RAM cartridge have ? |
| A: |
|
| |
|
Case
type
|
Sealed
case
(Non removable)
|
Removable
case
|
Empty
case
(Caddy)
|
|
Disc
|
Both
|
Double
-sided
|
Single
-sided
|
Double
-sided
|
Single
-sided
|
|
120mm
|
Type
1
|
Type
4
|
Type
2
|
Type
5
|
Type
3
|
|
80mm
|
|
Type
6
|
Type
7
|
Type
8
|
Type
9
|
|
| |
|
|
|
| Q: |
How reliable
is the data stored on bare DVD-RAM discs
? |
| A: |
Ordinary levels
of dust and fingerprints can be wiped off the disc with a cleaning
kit and do not
affect the data quality. Minor scratches will not affect data.
DVD-RAM drives incorporate extensive defect
management and error correction capabilities which are much more
powerful than any solutions implemented
up to now. These added capabilities are significantly more capable
of recovering data than previous
solutions.
Obviously,
the data has more protection in the cartridge or in the bare disc
case. But with careful, intelligent
handling, data can be read from the media hundreds of times for
at least the next 30 years.
|
|
| Q: |
What
is the difference between 2.6GB and 4.7GB DVD-RAM ? |
| A: |
|
|
|
Disc
|
DVD-RAM
|
|
Capacity
|
2.6
Gbytes
|
4.7
Gbytes
|
|
Side
|
Single
|
Double
|
Single
|
Double
|
|
Capacity
|
2.6
GB
|
5.2
GB
|
4.7
GB
|
9.4
GB
|
|
Outer
Diameter
|
120cm
|
|
Inner
Diameter
|
15cm
|
|
Thickness
|
0.6mm
x 2
|
|
Recording
Material
|
Phase
Material
|
|
Substrate
|
PC
Material
|
|
Linear
Velocity
|
6m/s
|
8.2~8.5m/s
|
|
Recording
Speed
|
11.08Mbps
|
22.16Mbps
|
|
Track
Pitch
|
0.74mm
|
0.615mm
|
|
Data
pit length
|
0.41~0.43
µm
|
0.28~0.29
µm
|
|
Minimum
mark Length
|
0.6
µm
|
0.42~0.44
µm
|
|
Track
Format
|
Wobble
Land Groove Recording Method
|
|
Recording
Method
|
Land/Groove
|
|
Rotational
Control
|
ZCLV
|
|
Error
Correction Code Length
|
RSPC
|
|
Sector
Size
|
2048
Bytes
|
|
Modulation
Method
|
8/16
Modulation RLL(2,10)
|
|
ECC
Data Blocks
|
32Kbytes
|
|
File
Administration
|
UDF
|
|
| Q: |
Can 2.6GB
DVD-RAM drive read and write 4.7GB DVD-RAM media ? |
| A: |
No, it can't
read and write 4.7GB DVD-RAM MEDIA, because their spec is different.
When 2.6GB DVD-RAM
was in the market, the specification of 4.7GB DVD-RAM is not to
be confirmed. So the 4.7GB
DVD-RAM can read and write 2.6 DVD-RAM media.
|
|
| |
| Q: |
How many
format types are there for DVD-RAM file systems ? |
| A: |
File
System statement: |
| |
|
UDF
1.5
|
- Data
in this format can be transferred between different operating
systems, for example Windows 9x and Mac OS.
- DVD-RAM
with UDF1.5 format cannot be used with DVDVideo recorders
that use the DVD Forum's video recordingstandard or with
the recording software designed for personalcomputers
.
|
|
UDF
2.0
|
- This
is designed for DVD Video recorders that use the DVDForum's
video recording standard and for the recording software
designed for personal computers. This format can not be
displayed in WindowNT & Windows 2000.
- The
computer you used should have UDF2.0 in it touse DVD-RAM
with UDF2.0 format.
|
|
UDF
2.01
|
- added
support for realtime files.These would be used by digital
recorders.
|
|
FAT-16
|
- Windows
OS embedded format type.
- This
format can be used in Windows 95, Windows 98, Windows
Me, Windows NT & Windows 2000.
|
|
FAT-32
|
- This
is the format type used on Windows 95 (OSR2 ), Windows
98 & Windows Me.
- FAT-32
formatted discs cannot be used on Windows NT.
|
|
| |
|
|
|
| Q: |
Why don't
DVD-RAM drives write to CD-R and CD-RW media ? |
| A: |
Because
of the cost/consumer benefit/reliability issue, the Forum chose
not to add CD-R/CD-RW capabilities.
They did, however, provide read capability to protect the user's
storage investment in older technology.
To add this write capability would have required the addition of
a second laser system in the
drive. This would increase the cost to consumer and add to the complexity
of the drive. Ultimately, the
complexity becomes a drive issue and the costs must be passed along
to the consumer. The price of
today's CD-RW drives are so low that buyers are better of buying
CD-RW drives for low-capacity storage
requirements and DVD-RAM for higher capacity /performance storage
requirement. However, there
is nothing to prohibit any manufacturer from adding the capability
in the future. |
| |
|
| Q: |
How long
can DVD-RAM/-RW/-R/+RW media be recorded ? |
| A: |
Normally
they can be recorded for 2 hours, but you can choose the required
mode you want. |
| |
|
Mode
|
Recording
time
|
Recording
Rate
|
|
XP
|
60
minutes
|
10
Mbps
|
|
SP
|
120
minutes
|
5
Mbps
|
|
LP
|
240
minutes
|
2.5
Mbps
|
|
FR
|
60~240
minutes
|
10~2.5
Mbps
|
|
| |
|
|
|
| Q: |
How many
Writers are there for DVD-RAM/ -RW/+RW in the market ? |
| A: |
Now
there are DVD-RAM and DVD-RW hardware in the market. The hardware
for DVD+RW will be |
| |
shipment
on 3rd quarter this year. |
| |
|
Hardware
for DVD-RAM
|
| |
|
Drive
|
Recorder
|
Camcorder
|
DVD-Player
|
|
Maker
|
Panasonic
|
Panasonic
|
Toshiba
|
Hitachi
|
Panasonic
|
Hitachi
|
Toshiba
|
Panasonic
|
Hitachi
|
Panasonic
|
Hitachi
|
|
Model
#
|
LF-D200/LF-D210
|
LF-D301
|
SD-W2002
|
GF-2050/GF-2055
|
DMR-E10
|
DMR-E20
|
DV-RX2000
|
RD-2000
|
VDR-M10
|
DZ-MV100
|
DVD-RP91
|
DV-RP100
|
|
Software
|
DVD-RAM
|
DVD-RAM
|
Write-DVD
|
Insatnt
write(VOB)
|
_
|
_
|
_
|
_
|
_
|
_
|
_
|
_
|
|
Size
|
12cm
/ 8cm
|
12cm
/ 8cm
|
8cm
|
12cm
/ 8cm
|
|
Cartridge
|
12cm
is not necessary / 8cm must be without cartridge
|
12cm
is not necessary / 8cm must be without cartridge
|
Necessary
|
must
be without cartridge
|
|
Hardware
for DVD-RW
|
| |
Drive
|
Recorder
|
|
Maker
|
Pioneer
|
Pioneer
|
Pioneer
|
Pioneer
|
|
Model
#
|
DVR-A03
|
DVR-1000
|
DVR-2000
|
DVR-7000
|
|
Media
|
DVD-RW
Ver. 1.0/1.1
|
DVD-RW
Ver. 1.0
|
DVD-RW
Ver. 1.0/1.1
|
|
Price
|
1000
USD
|
1500
USD
|
2000
USD
|
2000
USD
|
|
Size
|
12cm
/ 8cm
|
12cm
/ 8cm
|
|
|
|
|
| Q: |
Can we
use DVD-RW writer for DVD-RAM ? |
| A: |
No, you cannot,
because the specs are different. Now DVD-forum promotes the DVD-MULTI
which enable
disc compatibility for virtually all formats officially created
by the DVD-Forum, both for personal computer
(PC) and Consumer Electronics (CE) products. It
defines the minimum requirements of DVD Multi Drive, Player and
Recorder using 4.7GB DVD discs without
cartridge for compliance among the DVD Multi products. |
|
| Q: |
Can general
DVD-Player/Drive read DVD-RAM/-RW/+RW media ? |
| A: |
Currently not
possible for DVD-RAM but improving technology should allow it soon.
Basically,
DVD-RW/+RW format is compatible with existing DVD-ROM/Video Players.
Very old
models cannot understand the combination of Low reflectivity and
Single layer. In such cases, DVD+RW
will not be played back. |
|
| Q: |
After
DVD-RAM/-RW had been recorded by recorder, Can they playback on
|
|
the drive
directly ? |
| A: |
For
DVD-RW this is no problem. |
| |
For
DVD-RAM the end-user must install a software (DVD-MovieABLUM) .
|
|
