So which one are you going to buy?
HD-DVD [high definition digital versatile disc]: single layer stores 15 GB, dual layer stores 30 GB
system uses blue laser.
Digital Multilayer Disk (DMD) is an optical disc format developed by D Data Inc. It is based on the Fluorescent Multilayer Disc, which was created by the now-defunct company Constellation 3D. These disks have a 21 GB approximate capacity for a single side.
Blu-Ray: single layer stores 25 GB, dual layer stores 50 GB (scientists claim to have tested up to 33 GBs on a single layer–but not in production)
system uses blue laser –uses shorter wavelengths of light to store more information than HD-DVD
AVCHD (Advanced Video Codec High Definition): not much information — claims that it can be played on Blu-Ray Players and the PS3. its a new high definition recording format introduced by Sony and Panasonic. It can use various storage media, including 3″ recordable DVD discs, as well as hard disk, and SD and Memory Stick Pro memory cards, and is being positioned to compete with handheld video camera recording formats like HDV and MiniDV.
TMD [Tapestry Media Disc]: The discs will reportedly hold 300 GB when they come to the market, but have a maximum theoretical capacity of 1.6 terabytes using holographic memory technology to store data by interference of light. The read/write speed of this media is around 10 times the speed for a standard DVD. The Tapestry disc has an effective capacity of approximately 26 hours of high-definition video (25 Mbit/s data rate). The discs are marginally wider (13cm vs. 12cm) and thicker than conventional DVDs
HVD [holographic versatile disc]: single layer only– space measured in pulses per track. One Pulse = 60,000 bits. Distance between pulses can be decreased to increase capacity.
distance between each pulse per track:
18 micrometer density stores 100GB per disc
13 micrometer density stores 200 GB per disc
8 micrometer density stores 500 GB per disc
3 micromer density stores 3.9 TB per disc
system uses Green reading/writing laser, and a Red positioning/addressing laser
“It has been estimated that the books in the U.S. Library of Congress, one of the largest libraries in the world, would contain a total of about 20 terabytes if scanned in text format. Neglecting images, the content could be stored on a little more than 6 of these discs. At 15 meter resolution and 32-bit color (about the resolution found in unpopulated areas on Google Earth), a map of the land masses of Earth would occupy just over 2 TB. Using MPEG4 ASP encoding, a 3.9 TB HVD could hold between 4,600–11,900 hours of video—just over one year of uninterrupted video at usual encoding rates. [1] Using typical satellite radio encoding (CT-aacPlus at 40 kbps), a 3.9 TB HVD could hold over 26.5 years of uninterrupted stereo audio. The transfer rate is at an average of 1 gigabit/second, or 128 megabytes/second, around 6 times the transfer rate for current 16x DVD storage.”
****HVC [holographic versatile card]: “a data storage format proposed by Optware; the company’s projected release date for a Japanese launch is late 2006. They claim it will hold 30GB of data, have a write speed 3 times faster than Blue Ray, and be approximately the size of a credit-card. At release, the media will cost about ¥100 (roughly $1) each, reader devices are set to cost about ¥200,000(roughly $2000) while reader/writer devices are to cost ¥1 000,000 (roughly $8000) each.”
PCD [Protein Coated Disc]: Theoretical — could hold up to 50 TB’s of data on one disc. “PCD would greatly increase storage over Holographic Versatile Disc optical disc systems. It involves coating a normal DVD with a special light-sensitive protein made from a genetically altered microbe, which would in principle allow storage of up to 50 Terabytes on one disc. It is currently unknown when or even if this medium will become commercially available.”
TP3D [Two-Photon 3-D Optical Data Storage] refers to an optical storage system under development by a team at the University of Central Florida. Financed with grants from the United States, United Kingdom, and China, a team including Kevin D. Belfield and C. C. Corredor is pursuing a method of recording and preserving optical media at extremely high densities, by use of fluorescence and two-photon excitation microscopy. Media used in this application can operate for 10000 read-write cycles before it becomes degraded, and be stacked to support up to one terabyte of data. As of December 2006, this technology is still in the development phase.
Tags: blu-ray, dvd, formats, recording, technology
