nothing stands still in the computer business, certainly not storage technology. DVD(digital versatile Disk) was barely introduce before its successor threatened to make it obsolete. the successor to DVD is Blu-ray,so called because it uses a blue laser instead of the red one, which allows it ti focus more accurately and thus support smaller pits and lands. single sided blu-ray disk hold about 25 GB of data, double sided ones hold about 50 gb of data. the data rate is about 4.5 mb/second, which is good for an optical disk, but still insignificant compared to magnetic desks.
it is expected that blu-ray will eventually replace CD_ROM and DVDs, but this transition will take some years...
more is comming on this blog so stay connected with this......
