MGMT 1050 Lecture Notes - Lecture 27: Readwrite, Optical Storage, Logical Disk Manager
MGMT 1050 Lecture 27 Notes – Optical disk storage
Introduction
• Although this uses CPU processing time, modern computers have enough spare power
to make this a practical solution in many instances.
• It also reduces the possibility that a single RAID controller can cause the entire array to
fail.
• An alternative to magnetic disk storage is optical storage.
• Optical storage technologies include various types of CDs and DVDs, in read-only, write-
once, and read/write forms.
• Optical disks are portable and are capable of packing a relatively large amount of data
into a convenient package.
• For example, an inexpensive CD-ROM, 12 centimeters in diameter, stores approximately
650 MB, while a Blu-Ray DVD of the same physical size can hold more than 50 GB of
data.
• There is also a standard for a new optical disk, called HVD, for Holographic Disk, that,
when fully developed, is expected to hold more than 1.6 TB, but presently the cost is too
high for most uses.
• Optical storage serves a different purpose from magnetic disk storage.
• While magnetic disk storage serves primarily to store, read, and write data for current
use, optical storage is intended more for offsite archiving
• As well as program and file distribution, although the latter use has declined somewhat
due to the growth of the Worldwide Web.
• CDs and DVDs used for data storage use the same basic disk format as their audio and
video equivalents.
• Within certain file structure limitations, personal computer CD and DVD drives can read
and write audio and video CDs and DVDs that will play on home media equipment and
vice versa.
• Conceptually, CD-ROM data storage is similar to magnetic disk
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