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уже работает во всю, но для проф. применения. Там вообще blue-violet laser.
если кому интересно:
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Q: Why is Sony offering the Professional Disc media?
A: Sony believes that the Professional Disc media is a means by which our customers can
achieve benefits in production workflows, where flexibility, speed, and cost effectiveness
are key requirements. The Professional Disc media has been engineered specifically for
professional content creation; its data rate, data capacity, transfer speed, robustness,
and instant random access ensure professional-quality performance. Because the
XDCAM Professional Disc series of products employ existing MPEG IMX and DVCAM
codecs, disc advantages are immediately available without costly infrastructure upgrades,
while built-in network and metadata technologies provide unprecedented levels of
production flexibility.
Q: Is the XDCAM™ system's Professional Disc™ media the same as the consumer
Blu-ray media?
A: No. While there are some similarities, the Professional Disc media uses a unique phase-
change recording material to support higher read/write speeds. In addition, the
Professional Disc cartridge shutter supports access by two simultaneous pickups, while
the Blu-ray media shutter accommodates only one pickup. There is no cross-
compatibility between XDCAM products and Blu-ray products.
Q: What is the difference between the recording material used for consumer Blu-ray
disc and that used for the XDCAM system's Professional Disc media?
A: The higher transfer rates of the XDCAM system require a more sensitive phase-change
recording layer. The Professional Disc recording layer must change from crystalline (high
reflectivity) phase to amorphous (low reflectivity) phase fast enough to enable transfer
speeds of up to 72 Mbps per pickup (144 Mbps with two pickups). In comparison, the
writing speed of consumer media is 36 Mbps. Aside from the different phase-change
material, the track pitch, recording density and production processes are the same.
Q: How does the read/write/erase life cycle of the XDCAM system's Professional Disc
media compare to the Blu-ray disc?
A: They're identical in the minimum spec. Both are rated at a minimum of 1,000
read/write/erase cycles under normal operating conditions. The Professional Disc media
has a maximum read/write/erase life cycle of 10,000 under ideal operating conditions (73
degrees F, 50% RH)
Q: How does the XDCAM system's Professional Disc media differ from DVD?
A: Profoundly. Although both are 12 cm in diameter and 1.2 mm thick, Professional Disc
media has five times the capacity, 13 times the transfer rate, a shorter laser wavelength
and a protective cartridge for the media. Professional Disc media capacity is 23.3 GB,
compared to 4.7 GB for DVD. The XDCAM compact decks have a transfer rate of 144
Mbps with 2 pickups, compared to 11 Mbps for DVD. The XDCAM system uses a blue-
violet laser as opposed to the red laser used for DVD.
Q: Is the XDCAM system's Professional Disc media playback- or record-compatible
with DVD drives?
A: No. They have different file formatting, track pitch and pickup specifications, in addition
to different mechanical requirements.
Q: Will the Professional Disc media replace tape?
A: The Professional Disc is a new medium capable of storing a variety of formats, including
DVCAM and MPEG IMX. Therefore, Sony expects that the optical disc, as a new
medium, will supplement and reinforce existing videotape. There are application areas
where tape media is quite suitable, and areas where disc technology is more suitable.
The Professional Disc media and tape will coexist for years to come.
Q: For what applications are XDCAM Professional Disc systems intended?
A: XDCAM Professional Disc systems are intended for all video applications including
newsgathering, production, postproduction, vent videography, and so on.
Q: What type of compression does the XDCAM system use?
A: It depends on the video format being recorded. For DVCAM® format video it is DCT
(Discrete Cosine Transform). For MPEG IMX™ format video it is MPEG-2 (Moving
Picture Experts Group), 4:2:2 Profile at Main Level, at 30, 40 or 50 Mbps. Proxy A/V data
uses MPEG-4 Simple Profile video compression, and A-Law audio at total of 2 Mbps.
Q: What is the maximum transfer rate for the XDCAM system?
A: 72 Mbps with one pickup and 144 Mbps with two pickups.
Q: Is it necessary to format a disc prior to use?
A: Yes. Formatting, which creates a file system, is required for brand new discs; however,
this is a very quick process that is done when the disc is inserted into a camcorder or
deck. Because this happens so quickly, an end user will not be aware that the disc is
being formatted.
Q: What is the maximum recording time on the Professional Disc media?
A: Recording time varies with format and data rate. The approximate recording times for the
PFD23 Professional Disc media are as follows:
85 minutes - DVCAM format
68 minutes - MPEG IMX 30 Mb/s format
55 minutes - MPEG IMX 40 Mb/s format
45 minutes - MPEG IMX 50 Mb/s format
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HD-DVD (+) -- BFG -- 10.09.04@13:59 (Чит.: 241)