MP5120A IDE DVD+RW - Page
the DVD Recording with the first DVD+RW recorder!
DVD recording has been something that users kept dreaming for a long time
now. The increased storage capacity among with the option to create DVDs working
at stand alone players is the strongest points of the DVD format.
During the evolution of DVD recording, 8 companies offered an
alternative solution for DVD recording under the name of "DVD+RW".
DVD+RW has been standardized by 'DVD+RW Alliance' that consists of eight companies
including those recently promoted CD-R/RW: Sony (Japan), Dell Computer (USA),
Thomson Multimedia (France), Hewlett-Packard (USA), Philips (Netherlands), Mitsubishi
Chemical (Japan), Yamaha (Japan), and Ricoh (Japan).
8 companies promises ultimate performance among with maximum compatibility:
"...Recent technological advances, including Broad-band communication,
have brought about the need for larger storage capacity of recording media.
PCs are becoming a remarkably popular means of viewing TV programs. We see that
more opportunities to process even larger information/data will lead to various
needs for removable, large-capacity media that enable seamless data exchange
between PCs and AV appliances. DVD+RW is the rewritable DVD standard with capacity
of 4.7 GB to take all the needs into reality..."
- DVD+RW: Physical format
DVD+RW at a glance:
- Single-sided (4.7 GB) and double-sided (9.4GB) discs option
- Uses a bare disc - no cartridge required
- 650 nm laser (numerical aperture 0.65)
- Constant linear data density
- CLV and CAV recording
- Write speeds from 1x to 2.4x DVD-Video data rates
- Defect management handled by the drive
- Quick formatting
- Recording: (Sequential and random recording, 32 kB ECC blocks, Lossless linking)
DVD+RW format allows CAV recording (Constant Angular Velocity).
Due to the constant rotation speed of the disc CAV recording allows for fast
random access. Yet two other benefits are the incorporation of Defect
management, especially designed for reliability of the data, and Quick
formatting, enabling instant use of blank discs. Those benefits mentioned
above make this format ideal to use for high performance systems. For video
applications the format has the capability of lossless linking
allowing to use variable bit rate recording for longer playing times.
- The 'Lossless linking' feature
With DVD + RW, it is possible to perform lossless linking, i.e.
to suspend and continue the writing process without linking loss. The physical
structure of DVD+RW disc is designed to be compatible with DVD-ROM, and a combination
of HF (High Frequency) Wobbled Groove and ADIP (Address In Pre-Groove) correction
keeps the data connection points after adding or editing at 1 micron or less
(Lossless Linking function). This technology provides the excellent compatibility
even after data is added or edited. DVD+RW drives are also compatible with DVD+RW
Video Recorder, integrating PC and AV worlds.
Additionally, lossless linking makes it possible to replace any
individual 32 kB block (recording unit) by a new one, without losing compatibility.
For lossless linking, it is imperative to write any data block in the correct
position at a high degree of accuracy within a single micron.
In conventional optical recording drives the write/pause operation
causes a rather big area (usually one sector = 2 Kbytes) to be corrupted due
to poor linking accuracy at the border between two contiguously written pieces
This linking loss makes the disc incompatible with existing read-only
devices like DVD-Video players and DVD-ROM drives.
- The compatibility
DVD+RW recorders have designed to be two-way compatible, which
- Stand Alone DVD+RW recorders will play DVD-Video discs
- Recordings made on rewritable discs with a DVD+RW recorder can be played in
most DVD-Video players as well as in PCs with a DVD-ROM drive
All physical parameters of DVD+RW fit within the DVD-ROM specification.
The reflectivity is in the same range as the dual-layer reflectivity specification
of a read-only disc and the density is the same as for the single layer specification:
However Ricoh states, that the recorded media may not be readable
on approximately 30% of existing DVD-ROM drives and DVD-Video players. For
that propose Ricoh (DVD-ROM
players) and Philips
have lists of compatible drives. Those lists contain at 47 DVD players and 19
DVD-ROM drives that support DVD+RW format. This does not mean that a non-listed
drive does or not support DVD+RW.
- The Defect Management & Physical Formatting System
A DVD+MRW system according to the specifications in this document
will offer the following features:
- Full random access
- Data transfer between host computer and drive is based on 2K User Data Frames
- Defect Management handled by the drive (or by a dedicated Read-Only device
- Physical formatting performed in background by the drive (without interaction
with the host computer)
- Disc will be available for use immediately after insertion
- Ejecting the disc before the Background Formatting process is completed is
- Shortened formatting time (Featuring Background Formatting)
* Drive starts formatting for the random access write with a small
portion of disc first (lead-in area and part of the data area, required to start
writing). It then resumes for the remaining portion automatically in the background
when there is no writing or reading operation (Background Formatting). This
feature enables to start initial writing in just two to three minutes.
* Background formatting shall be suspended should additional reading/writing
* Discs that are only partially formatted can be ejected from
the drive, maintaining the compatibility with existing DVD-ROM drives.