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- HARD DISK WISDOM
- by Bill Dieck, KUB, September, 1987
-
- (Common sense about how to treat hard disks)
-
- The Hard Disk is a fairly rugged and reliable piece of hardware,
- but since it represents a considerable investment, I was thinking
- of ways to increase the time between failures. Preventative
- maintenance can be broken down into four simple rules:
-
- 1. Keep it Kool
- 2. Don't Move
- 3. Park It
- 4. Let 'Em Run
-
- It helps to know the reasons behind the rules.
-
- [Keep it Kool] the disk is both an electrical and mechanical
- device. In general the life expectancy of any electronic device
- is dramatically increased when the operating temperatures are
- kept low. Normally the only things we as hard disk users can do
- is make sure the ventilation is correct. This translates to
- keeping filters clean, fans operating, and keeping the room
- environment clean and at a reasonable temp. (65 to 70 degrees).
- Make sure the ventilation slots are not blocked by books, papers,
- etc.
-
- [Don't Move It] Well at least while the disk is power on
- (remember the disk spins as long as you have power to the
- computer). The disk pick-up heads that read/write the data 'fly'
- just a few thousands of an inch above the disk. If the heads
- come in contact with the disk surface (called Head Crash) they
- can permanently and catastrophically damage the disk. Even if
- the disk is not running (power up), you should take care and
- treat it for what it is. That is a High Tech., specialized close
- tolerance precision machine. A couple of G's impact force can
- mis-align the delicate Head/Disk alignment. Just a few inches of
- drop to a hard surface can create a G or two of impact force.
- Portable computers are generally more rugged by use of "shock
- mounts" to install the disk into the case. Remember, less
- movement is less chance of damage.
-
- [Park It] This is for the owners of disks that require parking.
- Not all disks require this (check your operators manual).
- Parking the heads means removing the heads from the data area of
- the spinning disk BEFORE you power off. The heads 'float' or
- 'fly' on a Laminar air cushion formed by the spinning disk. When
- the disk stops, the air cushion disappears and the heads can
- contact the recording material on the disk, potentially damaging
- the heads/disk. The command may vary, but the result is the
- same. Shipdisk, Parkdisk, etc. all remove the heads from the
- disk. Most newer models do this automatically when the disk
- electronics detects a power loss, and do not require the manual
- command.
-
- [Let 'Em Run] Generally speaking, start-up stress is more
- damaging to a machine than letting it run for several hours. If
- you intend to use the computer within a couple of hours, let it
- run. You will limit the stress due to variations in speed,
- temperature, voltage, etc. that occur during Power on/off cycles.
-