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The Sega Dreamcast GD-ROM of 1998 was a similar concept, but this used half-speed reading of discs with more closely packed pits to increase capacity to 1.2 GB.
Sega achieved the higher density by decreasing the speed of the disc to half and by letting the standard CD-ROM components read at the normal rate thus nearly doubling the disc's data density. This method allowed Sega to use cheaper off-the-shelf components when building the Dreamcast.
DDCD was part of a wave of technologies aimed at enhancing the compact disc, none of which managed to gain much market share.
MultiLevel Recording, developed in 1992 by Optex Corporation, was a proposed technology that never saw the light of the day. It promised to burn 2 GB onto one CD and a couple of disc burners from TDK and Plextor were set for release in 2002 for $200 with discs costing around $2. No ML products were ever released.
In September 2002, Sanyo announced it had achieved the same result as DDCD using standard CD-Rs with its HD-Burn technology. This allowed users to burn 1.4 GB on a standard 700 MB CD. However, the resulting CD could only be played back on DVD drives.
In 2003, Plextor released a CD burner that utilized their proprietary GigaRec technology to allow users to burn a maximum of 980 MB on a standard 80 minute CD and 1.2 GB of a 99 minute CD. Like DDCD, the result was achieved by burning smaller pits. The resulting disc could be read perfectly on Plextor GigaRec drives. Results with reading the disc on other optical drives were mixed.
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