l Magnetic tape is less prone to damage than other
forms of magnetic storage media
PHYSICAL PROPERTIES OF MAGNETIC
TAPE
Magnetic tape comes in a variety of widths and
lengths. It maybe contained in one of three categories
of storage media: industry standard open reels,
cartridges, or cassettes. Figure 9-1 shows the different
categories of magnetic tape media.
MAGNETIC TAPE CONSTRUCTION
Three basic materials are used to make magnetic
tape. They are:
The base material
A coating of magnetic oxide particles
Figure 9-1.—Magnetic tape reels, cartridges, and cassettes.
A glue that binds the oxide particles to the base
material
Figure 9-2 illustrates the basic construction of a
magnetic tape.
Base Material
The base material for magnetic tape is made of
either plastic or metal. Plastic tape is more common
because it is very flexible, resists mildew and fungus,
and is very stable at high temperatures and humidity.
Oxide Coating
Oxide particles that can be easily magnetized
(ferrous) are coated onto the base material. The most
common oxide materials are gamma ferric oxide and
chromium dioxide. It is very important that the oxide
particles are uniform in size and shape. If they are not,
the tape’s surface will be abrasive and might damage
the tape unit’s head.
Glue
The glue used to bond the oxide to the base is
usually an organic resin. It must be strong enough to
hold the oxide in place, yet flexible enough not to peel
or crack.
MAGNETIC TAPE HANDLING
PROCEDURES
Magnetic tape handling procedures include the
storage, handling, maintenance, and control of tapes.
Figure 9-2.—Magnetic tape construction.
9-2
