This leaves the data in the middle of the disc, which is necessary for DVDs to achieve their storage capacity. The storage capacity of optical discs is mainly limited by the physical dimensions of the dots. If you were to use non-rounded numbers, here’s how it fares out with the prices listed above: HARD DRIVE: $0.039995 per GB OPTICAL: $0.0404042553191489 per GB Optical storage devices offer significant advantages over other high-capacity storages devices, such as tape and microfilm, with faster access times and a hierarchical-type file organization. 100 DVD-5’s is 470GB worth of data storage, and the cost-per-gigabyte of storage you buy here is also $0.04 per gigabyte. The companies have cranked up the storage capacity on optical media to a stunning 3.3TB. Scientists from RMIT University in Australia and Wuhan Institute of Technology in China have developed a radical new high-capacity optical disc called “nano-optical long-data memory” that they say can record and store 10 TB (terabytes, or trillions of bytes) of data per disc securely for more than 600 years. Optical storage on the system provides an economical and efficient way to store and retrieve large amounts of information at a high performance level. The companies have cranked up the storage capacity on optical media to a stunning 3.3TB. Blu-ray discs, which are the newest type of optical media, can store up to 50 GB of data. In multi layer discs, semi reflective instead of reflective coatings are used for all layers except the last layer, which is the deepest one and uses a traditional reflective coating. Advantages of optical disk compare to magnetic disk: The storage capacity of the optical disk is more than a magnetic disk. Capacity, performance and price of optical storage devices are continually improving. This storage capacity is a clear advantage over the floppy disk storage media (a magnetic media), which only has a capacity … Optical discs like Blu-ray are losing favor, but Sony and Panasonic don't seem to care. Optical discs like Blu-ray are losing favor, but Sony and Panasonic don’t seem to care. The optical disk is physical storage than magnetic disks and can not be damaged easily. Disadvantages of the optical disk: The main disadvantages have cost both for the drive and the disks. CDs can store up to 700 megabytes (MB) of data, and DVDs can store up to 8.4 GB of data. The storage market is projected to grow to $100 billion by 2005, according to Jim Rothnie, senior vice president, product management, at EMC (Hopkinton, MA). Optical media can have a shelf life greater than 50 years. 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