TAPE-REPLACEMENT-LEVEL This is the point
at which the number of errors exceeds the rejection
Maintaining Magnetic Media
Maintaining media involves using specialized
library equipment to clean, certify, and degauss
magnetic media. It also involves seeing that media is in
The duties and responsibilities
include the following:
Splicing leaders onto magnetic tapes
Placing BOT/EOT markers on magnetic tape
Rotating tapes and disks
Inspecting and changing disk pack filters
Setting up and operating tape cleaners, certifiers,
Mounting and dismounting magnetic tapes
Performing cleaning, certifying, and degaussing
Performing emergency shut-down/power-off
procedures on equipment
Setting Up, Operating, and Maintaining
Be sure you and the head librarian know and can
explain the steps involved in setting up and operating
equipment. Be able to demonstrate the proper way to
clean, certify, and degauss magnetic media. Be sure all
library personnel know how to properly perform
emergency shut-down/power-off procedures on the
different types of equipment used in the library (tape
cleaner, certifier, degausser, and remote computer
terminal, if used).
Like any area with equipment, some operator
maintenance is required to assure proper functioning
and also to increase the useful life of the equipment.
Operator maintenance on tape cleaners and certifiers
should be performed on a regular basis and include the
. Removing and replacing cleaning blades
. Removing and replacing wiping tissues
. Removing dirt/dust from photoelectric cells
. Ensuring tape pack wheel is rotating freely
Ensure that proper and regular operator
maintenance is performed on the librarys equipment.
Keeping a log of when it was conducted and when it
should be done again will help. Make sure outer
cabinets are kept clean and free of dust. All dirt, oxide
particles, and other debris should be removed from the
capstans, turrets, tape pack wheel, and cleaning blades.
Cleaning blades should not be allowed to become
nicked or dull. Also see that the wiping tissues are clean,
and are rotating smoothly and automatically.
CLEANING AND RECERTIFYING
Today, the removable and interchangeable
magnetic disk pack is one of the most frequently used
mass storage media.
Not only is it small, fast, and
reliable, but with the proper care and handling, it has an
almost indefinite life span. Like magnetic tape, the
main enemy of the disk pack is dirt. During the
manufacturing of the disk packs, every precaution is
taken to maintain a sterile environment and a
contamination-free assembly of each component of the
disk. However, these safeguards do not entirely prevent
some contamination from occurring, and everyday
operation continues to increase the contamination level
until data checks (read/write errors) do occur.
During normal computer use, three different types
of errors are encountered on disk packs: temporary
errors, permanent errors, and disastrous errors (head to
disk contact or head crash).
TEMPORARY ERRORS OR SOFT DATA
CHECKS These temporary errors are the direct result
of a minor buildup of contaminants, such as dust,
smoke, and oil.
PERMANENT ERRORS OR HARD DATA
CHECKS These permanent errors cause data to be
lost because of an excessive buildup of contaminants.
As a result, the read/write heads are no longer able to
access this particular area on the disk.
HEAD TO DISK CONTACT OR HEAD
CRASH These disastrous errors are caused when a
read/write head of the disk drive unit comes into direct
contact with the surface of a disk platter. Again, this is
the result of an excessive buildup of contaminants.
These errors can be prevented by inspecting and
cleaning the disk pack. Although none of the major disk
pack manufacturers recommend a regular schedule for
cleaning of disk packs, they do recommend that disks be
cleaned and inspected when they have been exposed to