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Cool Page Magazine 14
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1993-06-21
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Rosenthal Engineering 3737 Sequoia, San Luis Obispo CA USA 93401
Copyright (C) 1993 All rights reserved.
Disk Drive Cleaner
When used with the special, NON-ABRASIVE, cleaning diskette and solvent
available from Rosenthal Engineering, this program safely removes debris
from the delicate read/write heads of floppy disk drives. Data loss,
unreliable performance and errors can often be traced to microscopic
foreign particles, dirt, dust, oxides and smoke that accumulates on the
disk drive heads.
- - - - - - - - - - - -
How to Use Disk Drive Cleaner
Copy the program and documentation to a working directory on your hard
drive. If your floppy drive ever becomes so contaminated that it won't
read a floppy diskette, you won't be able to read the Disk Drive Cleaner
program from a floppy disk either, so save it on your hard drive now.
To safely and effectively clean a floppy disk drive, dispense five drops
of the cleaning solution, supplied with the kit, onto the fabric exposed
by the head access slot of the special cleaning diskette. The cleaning
solution is isopropyl alcohol, so use appropriate precations to avoid
heat, flames and eye contact.
Insert the cleaner diskette into the drive normally. Different areas of
the cleaning disk are reserved for scrubbing, cleaning and polishing
operations to avoid recontaminating the progressively cleaned heads. Only
Rosenthal Engineering approved, NON-ABRASIVE cleaning disks may be used
with this program. The fabric material of these diskettes is less abrasive
than the industry specifications for the actual magnetic recording media.
Run the Disk Drive Cleaner program from the DOS prompt. The program will
prompt you to enter the letter of the drive to clean. The whole process
takes less than four minutes to clean even the dirtiest drives.
Take out the cleaning diskette. That's it, you're done!
- - - - - - - - - - - -
How to Obtain Approved cleaning kits.
The file ORDER.FRM contains a convenient order form to register the
software and order additional cleaning kits. Only NON-ABRASIVE cleaning
kits, approved by Rosenthal Engineering may be used with this program.
- - - - - - - - - - - -
How to Try This Software Without a Cleaning Kit
The best way to determine if any program will satisfy your needs is to try
it for yourself. The Disk Drive Cleaner program may be run without any
floppy diskettes in the drive for demonstration and evaluation. A message
warning that you have not inserted an approved, NON-ABRASIVE cleaning disk
will be displayed; however the program will function normally for your
evaluation.
To be effective, the special cleaning disk presents a running torque of at
least 0.9 ozf-in (65 gcm) with the heads loaded, so without a disk in
place, the demonstration will be considerably quieter than normal. Even
without a cleaning diskette in place, you should have no difficulty
hearing the drive go through its distinctly different cleaning cycles if
you listen carefully.
- - - - - - - - - - - -
Other Methods of Disk Drive Cleaning
There are two other methods used for cleaning floppy diskette drives. The
first involves at least partial disassembly of the disk drive and direct
cleaning of the heads and should be reserved for technically competent
service personnel. The second follows the directions printed on nearly
every cleaning disk kit available, but is not as effective as using the
Disk Drive Cleaner program.
Obsolete Cleaning Method I
This method involves directly cleaning the internal disk drive heads and
mechanism and should therefor, be left to competent technical personnel,
regularly involved with manufacturers factory service. With the relatively
low cost of new disk drives, it is rarely practical to invest in this
level of service, unless the drive is special or particularly expensive to
replace; For example, drives used in automatic mass disk duplicators.
Standard drives may be easily replaced, and new drives are usually
available for about the same (and often less) than the cost of repairing a
worn drive.
If a drive is particularly filled with debris, say from attempting to read
a diskette buttered with peanut-butter and jelly, this may be the only
method of salvation. The contaminated parts are gently cleaned with soft
cotton rags and isopropyl alcohol. Several rags are used so the parts
become progressively cleaned with fresh clean rags. Care is made to not
recontaminate a freshly cleaned surface with a dirty cleaning implement.
Cleaning the heads themselves must be done extremely delicately. Inside
the outer plastic (Poly Chloride) jacket of a floppy diskette, is
substrate material (polyethylene terephthalate), thinly (.0001 inch or 2
um nominal) coated with iron oxide (rust) and a binder. The heads
themselves are designed to make intimate compact and ride directly on the
magnetic medium. A delicate spring forces the read/write heads to ride
against this very thin magnetic surface. Technicians must use extreme care
to not exceed the the pressure normally exerted by the spring when
burnishing the heads.
To be effective burnishing heads must be done in-line with the read/write
head gap. A read/write head is a very small core wound with a coil of fine
wire. You can picture these tiny heads as a donut or bead (toroid) with a
fine slot cut through it from the center to the outside. The toroid is
then embedded in a ceramic or plastic material so the slot, or head gap as
it's called, is exposed at a polished surface to contact the magnetic
medium. The head gap rides perpendicular to the direction to travel of the
disk lined up like the spokes of a wheel, and should be cleaned in that
direction. When burnishing, the heads and cleaning fabric must be passed
back and forth across the head gad following a radial path like the spokes
and the diskette being the wheel. Technicians cleaning the heads directly
can use isopropyl alcohol and "Lintless Head Cleaning Swabs" (General
Cement #GC 32-3081 or Radio Shack #44-1094). Again, use several swabs so
the head is not recontaminated, as the surface area of the swabs is far
less than that of a cleaning diskette. This burnishing should be followed
up with a normal cleaning using the Disk Drive Cleaning program, as your
human technician (I hope this applies), can not physically burnish the
heads at the same high speeds the program does so effectively.
Technicians will also notice that the program will exercise the drive and
heads with or without the cleaning disk in place. This can often be useful
when freeing a drive mechanism or lubricating (*SPARINGLY PLEASE!*)
sliding and bearing parts.
Obsolete Cleaning Method II
This is the "smear it around" method described on the package of every
cleaning disk kit I've seen. You apply their cleaning solution to their
paper or fabric cleaning diskette. The user then enters a DOS command like
DIR and the computer tries unsuccessfully to read the single outside track
until it gives up with an error. Abrasion is not generally of concern,
because the heads are not oscillated or burnished across the cleaning disk
and the disk only runs for about thirty seconds or less.
In this "smear it around" method, only a very small area of the cleaning
disk is used, and no effort is made to reserve different portions of the
cleaning diskette for progressively cleaner operations. The relatively
small area of the cleaning diskette that is accessed, quickly becomes
contaminated, and the absolute maximum