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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.
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:
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
8 cm
1.46 GB
650 nm (0.6)
Mark edge recording
Wobble land groove
0.615 µm
0.28 µm
2048 bytes
8/16 modulation
22.16 Mbps
12 cm
4.7 GB
2.6 GB DVD-RAM
(Version 1.0)
2.6 GB
0.74 µm
0.41 µm
11.08 Mbps
RSPC (Reed Solomon Product Coding)
DVD-ROM
(reference)
4.7/8.5 GB
650 nm (0.6)
(playback only)
(Playback only)
Pit
0.27 µm
(Playback only)
4.7 GB (1.46 GB) DVD-RAM
(Version 2.1 & 2.0)
