HItachi developed 100Gb blue ray DVD.

http://pc.watch.impress.co.jp/docs/2007/1003/ceatec03_1.jpg

(This is a translated page and can be wrong)
CEATEC JAPAN 2007 with 7 and 8 holes, mainly with the exhibition and 9/10/11 holes concerning the semiconductor product and mechanism/the part network concerns and the home appliance product etc were displayed mainly. Especially, it was felt that with the 9~11 hole, Blu-ray Disc (BD) the exhibition regarding was done, large number finally entered into real spread time.
Something related to ●BD
　With the BD-related technical exhibition, displaying the experimental model of the optical disk where Hitachi, Ltd. corresponds to BD of 4 layer. By the fact that the signal quality which is stabilized in addition to changing the focus of the pickup to 4 stages, 4 layer in entirely is obtained, those which make the read-out of 4 layer possible. If BD of 4 layer is utilized, be able to actualize the optical disk of capacity 100GB, so far Kousei detail above the contents and the like become reproducible.
　In addition, as for the same company the technology which is directed to the utilization of 8 layers BD in the midst of research. When it reaches 8 layer, as layer becomes deep, in order reflected light the 衰 decrease to do, there is a problem that the signal becomes weak, but the light which is not applied to the lens by the fact that it interferes, be able to expand the signal in approximately 10 times, you say that you can expect the SIGNAL-TO-NOISE RATIO ratio improvement of approximately 20dB. If BD of 8 layer appears, you say that the bulk, 200GB with 1 can be actualized.

Continue reading.......... (http://64.233.179.104/translate_c?hl=en&u=http://pc.watch.impress.co.jp/docs/2007/1003/ceatec03.htm)

I heard they were working on terabyte Blu-Ray. Maybe they mis-interpreted the size... I'll see if I can find the article. Here it is:

Panasonic unveils terabyte Blu-ray recorders Consumer Electronics By Wolfgang Gruener Tuesday, October 02, 2007 11:28
Osaka (Japan) – Panasonic announced three new Blu-ray recorders with integrated hard drives that are good for storing up to 381 hours of full HD video, thanks to what appears to be the first 45 nm chip on the market.


http://www.tgdaily.com/images/stories/article_images/panasonic/panasonic_bluray_425.jpg

It isn't Intel that will be first to be introducing 45 nm chips after all. In a rather surprising announcement made at CEATEC Japan 2007, Matsushita - better known for its consumer brand-name Panasonic - introduced three new Blu-ray recorders that enables users to store up to 200 HD movies on the integrated hard drive (http://www.tgdaily.com/#).

At the heart of the new players DMR-BW700, BW800 and BW900 is a new 45 nm LSI, which encode and decode content in MPEG-4 AVC/H.264 instead of the previously used MPEG-2 format. Matsushita said that the transition has "quadrupled the recordable time for the same media compared with MPEG-2 (…) since the image compression can be performed at twice or three times the usual efficiency (http://www.tgdaily.com/#)."

The manufacturer did not release any performance (http://www.tgdaily.com/#) details about the chip, but noted that it carries 250 million transistors.

Of course, storing HD videos still requires lots of storage space (http://www.tgdaily.com/#), and the new Blu-ray recorders have lots of it. The entry-level 700 comes with 250 GB, the 800 with 500 GB and the 900 with 1 TB, which, according to Matsushita, is enough to hold up to 381 hours of "full" HD video. At least in theory, consumers should be able to create a library of around 200 movies on the 900.

Pricing has not been announced, but we hear that the new players will cost between 180,000 yen to 300,000 yen when they will be released on November 1. Checking the currency converter, the Japanese price translates into a price range of about $1550 to $2590. Matsushita (http://www.tgdaily.com/#) did not say if it will make these new recorders available outside of Japan.


--
Ok, it's not the same thing, but still same topic.

Can you imagine how much blank DVDs of this type would cost? Shattering.