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2.
Information on DVD-RAM Discs
2.1 Comparison of DVD-RAM Discs
The 4.7GB DVD-RAM is standardized as Version 2.0 with respect to the 2.6GB DVD-RAM (Version 1.0), and the major
differences are as follows:
The 8-cm DVD-RAM media is standardized as Version 2.1: It can be used with disc removed from cartridge as well as in
cartridge in the same way as with 12-cm DVD-RAM Type 2.
Diameter of media
Capacity (per side)
Laser wavelength (NA)
Recording format
Track format
Track pitch
Date recording bit length
Sector size
Modulation scheme
Error correction format
Recording rate
Notes: 1) In addition to the above, the 4.7GB DVD-RAM has a new defect control system to handle real time recording of
AV data.
2) Among the rewritable DVD standards, only the 4.7GB DVD-RAM is standardized for the 8cm size.
2.2 DVD Video Recording Standard
The DVD video recording standard is a newly established common standard to record video on DVD in real time. The DVD
video standard has already been used for read-only DVD, but it was previously exclusively for playback, so the following
were difficult:
Recording in real time
Addition or deletion of video/audio
Editing
The DVD video standard was reviewed to establish a DVD video recording standard which defines the devices for achieving
the characteristics inherent in disc, starting with the following, in addition to the capabilities of real-time recording and editing
on rewritable DVD media:
E1 - 2
4.7 GB (1.46 GB) DVD-RAM
(Version 2.1 & 2.0)
8 cm
12 cm
1.46 GB
4.7 GB
650 nm (0.6)
Mark edge recording
Wobble land groove
0.615 µm
0.28 µm
2048 bytes
8/16 modulation
RSPC (Reed Solomon Product Coding)
22.16 Mbps
2.6 GB DVD-RAM
(Version 1.0)
2.6 GB
4.7/8.5 GB
650 nm (0.6)
(playback only)
(Playback only)
Pit
0.74 µm
0.41 µm
0.27 µm
11.08 Mbps
(Playback only)
DVD-ROM
(reference)
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