Like many new releases, Metallica’s latest album “Death Magnetic” was uploaded to the popular file hosting service Rapidshare one day prior to its official release date last year. Since users don’t broadcast their IP-address or distribute files to the public directly though Rapidshare, it came as a surprise when the police raided the house of an uploader a few weeks ago.

At first it was unclear how the identity of the uploader was revealed, but today German news outlet Gulli said it had found out that this was likely to be accomplished by creative use of paragraph 101 of German copyright law. It turns out that several record labels are using this to take legal action against those who share music on Rapidshare.

In Germany, the file-hosting service Rapidshare has handed over the personal details of alleged copyright infringers to several major record labels. The information is used to pursue legal action against the Rapidshare users and at least one alleged uploader saw his house raided.

General Electric says it has achieved a breakthrough in digital storage technology that will allow standard-size discs to hold the equivalent of 100 DVDs.

The storage advance, which G.E. is announcing on Monday, is just a laboratory success at this stage. The new technology must be made to work in products that can be mass-produced at affordable prices.

But optical storage experts and industry analysts who were told of the development said it held the promise of being a big step forward in digital storage with a wide range of potential uses in commercial, scientific and consumer markets.

“This could be the next generation of low-cost storage,” said Richard Doherty, an analyst at Envisioneering, a technology research firm.

The promising work by the G.E. researchers is in the field of holographic storage. Holography is an optical process that stores not only three-dimensional images like the ones placed on many credit cards for security purposes, but the 1’s and 0’s of digital data as well.

The data is encoded in light patterns that are stored in light-sensitive material. The holograms act like microscopic mirrors that refract light patterns when a laser shines on them, and so each hologram’s recorded data can then be retrieved and deciphered.

A crucial challenge for the team, which has been working on this project since 2003, has been to find the materials and techniques so that smaller holograms reflect enough light for their data patterns to be detected and retrieved.

The recent breakthrough by the team, working at the G.E. lab in Niskayuna, N.Y., north of Albany, was a 200-fold increase in the reflective power of their holograms, putting them at the bottom range of light reflections readable by current Blu-ray machines.

“We’re in the ballpark,” said Brian Lawrence, the scientist who leads G.E.’s holographic storage program. “We’ve crossed the threshold so we’re readable.”

In G.E.’s approach, the holograms are scattered across a disc in a way that is similar to the formats used in today’s CDs, conventional DVDs and Blu-ray discs. So a player that could read microholographic storage discs could also read CD, DVD and Blu-ray discs. But holographic discs, with the technology G.E. has attained, could hold 500 gigabytes of data. Blu-ray is available in 25-gigabyte and 50-gigabyte discs, and a standard DVD holds 5 gigabytes.