With MP3, a dozen albums can be squeezed onto a single CD-ROM.

A single CD-Rom can store 250,000 pages of typed text or thousands of images.

As the amount of material increased with each new edition, the quality of media tended to decrease, in order to fit everything on a single CD-ROM.

Episodes 2 and 3 were released together on a single CD-ROM.

It is already possible to buy a single CD-ROM containing all the written material available from classical Greece and Rome.

A single CD-ROM can hold 100 or more programs.

An updated version of the entire work was published on a single CD-ROM last year.

But all the volumes can fit on a single CD-ROM, which can store up to 300,000 pages of text and do cross-referencing in a flash.

The technology that allowed the makers of the Ring Disc to squeeze all four operas onto a single CD-ROM is also astonishing.

According to the designers, the dialogue was edited for lack of space-a single CD-ROM can only hold about 80 minutes of uncompressed audio data.