Changes

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In the previous chapter we began looking at the security as it relates to the various elements that comprise a typical IT infrastructure. In this chapter we will look at media security in terms of both cable media and storage media.

== Shielded and Unshielded Twisted Pair Cable (UTP/STP) ==

Almost all coax cable has now been replaced with faster twisted pair cable. Twisted pair cable uses pairs of twisted wires (as used by phone lines). The grouping together of multiple twisted pairs limits cross talk and interference enabling greater transmission speeds to be achieved.

The most recent development in the storage media field involves memory based cards and disk drives. These devices contain banks of static memory (by ''static'' we mean that data remains when power is removed). Initially popular in cameras, PDAs and music players (typically using Smart Cards and Flash Cards), this technology is now moving rapidly into disk technology with a wide range of high capacity, solid state hard disks now available. The advantages of this technology include lower power consumption (no need for the motor and spinning plates of a conventional disk drive) and durability (none of the fragile moving parts to get damaged when dropped).

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