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The combination of optical and magnetic storage disks in a single system allows documents to be created and edited on magnetic media and then written permanently onto optical disks.
English (United States)
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Optical/ Magnetic Storage Disk System
The combination of optical and magnetic storage disks in a single system
allows documents to be created and edited on magnetic media and then written
permanently onto optical disks.
When a document is created, it is often changed numerous times before its
final version. After it has been edited into its final version, it is often undesirable
for further changes to be made. For example, after a letter has been created and
mailed, it is not desirable for further changes to be made in the stored version of
the letter. Thus, during the information creation stages, magnetic media is
preferred since the information is easily written over and revised. After the
document is complete, non-alterable storage in the form of an optical disk is
preferred because of the superior recording density over that of magnetic storage
and because the information cannot be further modified.
In Fig. 1, disk 1 has an optical medium side 2 and a magnetic medium side 3.
Magnetic read/write head 4 is controllable to access particular tracks and sectors
on side 3 for reading and writing. Optical read/write head 5 is controllable for
accessing particular tracks and sectors on side 2 for permanently writing data
onto these portions and reading previously written data therefrom.
In Fig. 2, a combination magnetic/optical disk is embodied in concentric
sections. Disk 11 includes an Inner magnetic medium 13 and an outer optical
medium portion 12. Magnetic read/w...