An Israeli firm known as Mempile is currently working on a new form of DVD called TeraDisc DVDs, which will offer 1TB of permanent storage on a single disk. The company has already managed to develop a disk capable of storing half a terabyte, and expects the 1TB disks to become available within the next few years. The disks, which are made of a polymer similar to Plexiglas, use powerful red laser technology to read and write, with a second laser which tracks data. The technology works by writing bits at the molecular level, which changes the color of florescent molecules in the disks. The main advantage of this method over current technologies such as HD DVD are that it has far less background noise, allowing it to read and write to hundreds of layers without any deterioration. The company plans to launch a 700GB version in 2011, with an expected price of around $30 per disk - although the DVD drives required to play them could set you back between $3,000 and $4,000.