Skip to comments.Sharp to Introduce 100GB Triple-Layer Blu-ray Disc Media
Posted on 07/17/2010 12:37:24 PM PDT by Ernest_at_the_Beach
Sharp Corporation will introduce the VR-100BR1 triple-layer Blu-ray Disc media (write-once) that conforms to the BDXL format specification, the new multi-layer recordable Blu-ray Disc format, a world first. These new Blu-ray Discs will be available in Japan beginning July 30, 2010. This disc media product conforms to the new BDXL format specification that extends the storage capacity of Blu-ray Discs to 100GB, twice the 50GB storage capacity of existing dual-layer discs. This new format enables recording approximately 12 hours of terrestrial digital
(Excerpt) Read more at hardocp.com ...
Now we need the encoding and reading hardware.
Now for 1T ultra fast r/w flash drive for less than $100
Don’t scratch it :)
And I thought I was cool when I bought my 1GB flash drive a number of years back...
I thought the 100MB Zip Drive was major breakthrough when I bought it.
“This new format enables recording approximately 12 hours of terrestrial digital”
Is there such a thing as space digital or subterranean digital? Solar digital anyone?
When I got my frist Atari 800 in 19 hundred and eight three with 320KB single sided, I was in heaven moving from the tape storage cassettes.
I still have a bunch of those....
I thought the 80 MB hard drive was the greatest ever when I bought it!
Pretty soon we’ll have a CD that can contain the contents of an entire Congressional Bill.
Bad dream. Dang you for reminding me.
And image from the thread....thanks to martin_fierro .
The Hard Drive Coffee Table top is an original 26″ diameter hard drive platter from an early storage device (circa 1970). The center hub of the platter is solid aluminum. The custom-created pedestal is also solid aluminum; a cylinder measuring 5.9″ in diameter and 18.5″ in length. It has a machined top and bottom to fit into the hard drive hub and base, respectively. The base is a solid aluminum 12″ diameter, 1.75″ high round obtained from a now-defunct government laboratory. Four bolts are screwed into tapped holes in the pedestal in order to secure the hard drive platter and the pedestal is press-fit into the base. It is covered with standard 1/4″ table glass. The completed design measures 19.5″ high and weighs 64 pounds.
I would have to chase back thru the IBM archives ...( Not saying it was an IBM made device.)
But This was very early:
I am guessing this is from the RAMAC 350:
The magnetic disk invented by IBM in the early-1950s contained 100 concentric tracks on each side. Each track stored 500 alphanumeric characters, yielding a total storage capacity of 5 million characters. This disk enabled users to retrieve any piece of information directly in less than a second.
Oh great, more room for PrOn!
I was exhausted after learning quite a few years ago what goes on inside of a CD player. Dvd and Blu-ray are just higher density and higher speed CDs.
Sticking with the Blu-ray, the tracks are 12 millionths of an inch apart. Do you think that hole in the middle is within 12 millionths of being in the exact center of the tracks? How flat is the disk? Nowhere near within millionths of an inch.
Therefore, the laser assembly has to follow a track “on the fly”. It can tell when it’s on the center of a track by the nature of the signal being read. It can tell, as it flys over the track, whether to move a few millionths of an inch side to side, and also up and down, to stay centered on the track and at the proper elevation above it (the laser doesn’t touch the disk).
Then there’s the matter of the rotational speed of the disk. You can be sure that a fixed-speed motor stay at exactly the correct speed so the data comes off at the rate needed play a video or audio, so the data coming off the disk is fed into a buffer. The video decoding part of the player pulls the data out of the buffer at a precisely controlled speed. If the buffer moves toward empty because it’s not being filled fast enough, the spindle motor is speeded up to increase the buffer-fill rate, and the motor is slowed if the buffer is being filled too fast.
How does that little laser jump back and forth and up and down so fast and cheaply and precisely? It is mounted in rubber with little magnets to pull the laser as needed to keep it on the center of the track.
In addition to the video or audio data the tracks contain there’s also data telling which track is being read (e.g. track 10,472).
Portable CD players can be bounced around with no interruption to the music because the player can tell if it was jostled to another track, and it can bring itself back to the proper track. Several tracks worth of data are buffered (this is another buffer) so that while the laser is being repositioned on the correct track, the video or music keeps coming with no interruption.
Then there’s the matter of multiple layers. Each layer except the bottom one is semi-transparent. The laser, which has a little lens like a microscope, can focus on one layer with the others sufficiently out of focus so they don’t interfere with the data coming off of the desired layer. The tracks also have data telling which layer is being read.
And these gadgets can be bought for a few tens of dollars! They are both high precision and not high precision. They rely on a lot of software and cheap mechanical parts and cheap compute power.
The way video data is recorded and decoded is another major drama that I’ll not go into now but will if a lot of readers just must know.
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