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- Noisy Drives
- or Don't You Growl at me
-
-
-
-
- One of the many annoying features of the IBM PC and certain compatibles is
- the noise generated by the floppy disk drives. I have found almost
- invariably that the fault is not in the drive but in some brain damage
- associated with the original design of the system. Apparently when Big Blue
- first designed the PC, they were anticipating using the "worst case" floppy
- disk drives. These drives were to be so poorly designed (i.e. cheap) that
- they had to use a 9 millisecond track to track step rate. Thus, and from
- then on, all disk drives, no matter how good, were to be driven at this slow
- rate. But then, who ever accused the Big Blue Mother of using good disk
- drives?
-
-
- Unfortunately, (or fortunately as you view it) most decent drives are
- designed to run at a stepping rate of at least 6 millisceonds (track to
- track). When these drives are run at lower than their rated stepping rate,
- they often sound like thrashing machines. Resonance sets up and the system
- will almost walk off the table.
-
-
- Unfortunately, the cloners in their thirst for 100% compatibility stuck with
- the 9 ms. step rate. Thus, a lot of the "clones" also sound like thrashing
- machines.
-
-
- Most (if not all) of the floppy drives manufactured today are designed to
- operate at a 6 ms. step rate. Some of the full height drives, such as the
- MPI 52A, while rated at 5 ms will operate dependably (and very quietly) at 3
- ms. All of the half height drives that I am aware of will operate at 6 ms.
-
-
- Having a low threshold of pain as far as noise is concerned, I decided to do
- something about it. The program STEPRATE is the result.
-
-
- ===========================================================================
- Usage:
-
-
- STEPRATE [r]
-
-
- where r is 3, 6, 9 or 12
-
-
- If STEPRATE is run without any parameters it will display the present step
- rate.
-
-
- ==========================================================================
-
-
- Determining the Proper Step Rate:
-
-
- How can you determine which step rate is proper for your drive? Simple!
- First boot up your system. Set the step rate at 12 ms by the following:
-
-
- STEPRATE 12
-
-
- Then insert a clean diskette into drive B or drive A in the case of a hard
- disk system, and fill it up with files via a COPY *.* command. You should
- be able to hear the drive grinding away.
-
-
- .cp 5
- Now, erase all the files from the "clean" diskette (Drive B) and set the
- step rate to 9 ms via:
-
-
- STEPRATE 9
-
-
- Repeat the COPY procedure to the "empty" diskette. The drive noise should
- be different (but perhaps not less).
-
-
- Next, set the step rate to 6 milliseconds via:
-
-
- STEPRATE 6
-
-
- and perform the noise test using the the copy command again.
-
-
- Finally, set the step rate to 3 milliseconds by:
-
-
- STEPRATE 3
-
-
- and test again.
-
-
- If the specified step rate is too fast for the particular drive, you will
- probably get SEEK errors or BAD SECTOR error messages during the COPYing
- process. In this case, use the next higher step rate (i.e. larger number).
- Once the correct step rate is found, include the command in your
- AUTOEXEC.BAT file.
-
-
- May peace and tranquility be yours!
-
-
-
- Don L. Finley
- 310 Willow St.
- Mt. Carmel, TN 37642
- (615) 357-3355 (after 7 pm)