On viewing the data, the eve would not likely be troubled by a tiny dot among an ocean of dots being the wrong shade of grey. Their chief advantage ma,v lie in very cheap cost per bit storage, but at this time they suffer from relatively high error rates. 3.3.1.6.5 Magneto-Optical Disk Disks that combine the use of magnetic and optical technologies. To record data, elements of the crystal structure of the substrate are aligned by using a laser to heat the element in the presence of an applied magnetic field. Compression Compression refers to the extent to which the encoded form of the preserved or reformatted document has been modified to reduce the amount of storage space required by the storage medium.
Compression is an important factor in the economics and efficacy of digital preservation.
3.3.2.1 Uncompressed No compression has occurred. 3.3.2.2 Reversibly Compressed Compression has occurred so that the process can, if required, be reversed so that the original can be recovered without loss of information. See also 3.3.4. 3.3.2.3 Irreversibly Compressed Compression has occurred so that the process cannot be precisely reversed. The original cannot be recovered without loss of information.