more reliable than existing hard disk technologies. IBM has already demonstrated the possibility of holding 1 TB of data in a crystal the size of a sugar cube and of data access rates of one trillion bits per second. The major challenge ahead is expected to be the development of a rewritable form of holographic storage. During CES 2006, a workable holographic drive was tested and stored 300 GB of memory compared to Blu-ray's 100 GB. It has been announced that hologram disks will be a post-Blu-ray storage device. References Holographic data storage Computer storage devices