Myth #11 : |
The head actuators are powered by a motor that can fail due
to excessive use. |
Truth : |
Current head actuators are actually not powered by any motor. In the past, head actuators were powered by a stepper motor. But
current head actuators use the voice coil mechanism which uses electromagnetic
force to move the heads.
So, if the head actuators are not powered by any mechanical motor,
how can "its motor" fail? |
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Myth #12 : |
Frequent parking of the read/write heads will make the head
actuators' motor fail earlier. |
Truth : |
See Myth #11 regarding the head actuator's "motor".
In addition, please note that head parking in current hard disk drives occurs
automatically whenever power is cut or when the hard disk drive powers down.
It is not an active process.
The head actuators either use springs or the platters' rotation energy to park. In drives that use a spring, the actuators are moved against the spring tension.
But when power is cut, the spring automatically retracts the actuators.
Therefore, even if head actuators are powered by a motor, head parking
will never cause that motor to fail. |
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Myth #13 : |
The hard disk drive only spins up when it needs to read or write data.
It spins down when it is idle. |
Truth : |
The platters are kept spinning all the time, unless you
have set it to spin down to save power after a period of inactivity. Spinning up the platters take a lot of time and power, hence it is inefficient for the hard disk drive to constantly spin down the platters.
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Myth #14 : |
It is better to spin down the hard disk drive whenever you can to
reduce stress on the spindle motor. |
Truth : |
Normally, the platters are spun up at start up and kept spinning
after that. The spinning up process is the most taxing part on the hard disk drive's spindle motor. Maintaining the spindle speed thereafter requires a lot less
effort.
If the platters have spun down and you need to read/write something
on the platters, you will need to spin up the platters to full speed
before you can read or write. Therefore, if you want maximum performance, it's better to keep the hard disk drive spinning.
However, spinning down the hard disk drive during periods of inactivity can not only reduce power consumption, it can also reduce the heat produced. The reduced thermal output will increase the longevity of your hard disk drive.
So, while spinning down the hard disk drive will not reduce stress on the spindle motor, it can reduce the hard disk drive's power consumption and thermal output as well as increase its lifespan. |
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Myth #15 : |
Sudden power cuts can cause bad sectors! |
Truth : |
Bad sectors are not caused by shutting off your computer suddenly. That used to be true in the old, OLD days when you had to park
the hard disk drive heads before you turned off your computer.
Modern voice coil actuators will automatically park the read/write heads
whenever power to the hard disk drive is cut off. Therefore, there is no risk of any head crashes that can create bad
sectors. |
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Myth #16 : |
Bad sectors
can be repaired just by reformatting the hard disk drive. |
Truth : |
A bad sector is a sector that cannot be written to or read from properly.
It can be due to a software related issue, resulting in a logical bad sector. These bad sectors can be restored by formatting or using a logical bad sector repair utility.
In the worst case scenario, the problem may be due to eroded media or direct physical damage to the media.
Such physical bad sectors cannot be repaired by any software and formatting will not restore
them. However, formatting can replace these bad sectors with spare sectors reserved for that very purpose.
Replacing the bad sectors with spare sectors will inevitably cause some degradation in performance as the spare sector is often physically located some distance away from the bad sector. In some cases, this performance degradation can be mitigated by reformatting the drive.
IBM (now Hitachi Global Storage Technologies) uses a custom "Format Unit" command that merges the remaining good sectors with the spare sectors and reassigns their sector numbers so that they are all in sequence. This does not actually fix the bad sectors but it greatly reduces the performance-sapping effect of using a spare sector. It will also reset the SMART counter #5 : Reallocated Sector Count. Thanks for the tip, cypherpunks! |
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Myth #17 : |
There is nothing to worry about bad sectors because you can
"erase" them by formatting the hard disk drive. |
Truth : |
True, formatting can replace bad sectors with good sectors
on the spare tracks that are part of every hard disk drive. However, performance suffers because the heads have to seek to the
spare tracks for those replacement sectors.
In addition, there are only a limited number of spare
sectors available on any hard disk drive. Once you run out of spare sectors, formatting will not be able to replace them.
Finally, bad sectors are a sign that something is wrong with the hard disk drive. Even if it was due to a single head crash, that traumatic event
would have created debris within the platter compartment and a damaged
head. The debris can gradually cause scratches and erosions on other
parts of the platter while a damaged head will not be aerodynamically
stable and will be more likely to crash in the future.
In other words, if you have critical data, it would be a smart thing
to back up your data and replace the hard disk drive when you start detecting
bad sectors. The hard disk drive may go on for a long time without more bad
sectors appearing but the risk of it dying is real and should not be
ignored. |
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Myth #18 : |
You must format your hard disk drive every <insert duration
of choice> to improve performance. |
Truth : |
This is yet another common fallacy, probably borne from the experience of users who noted improved responsiveness of their PCs after formatting and reinstalling their operating systems. However, this is due the freshly-installed operating system which has not yet been saddled by software that have to be loaded at start-up.
Formatting your hard disk regularly
will NOT improve your hard disk drive's performance. If you notice a significant degradation in your hard disk drive's performance
after several months, this is because the data in the drive has
become so fragmented that the read/write heads have to seek all over
the platters while reading or writing data. Try defragmenting your hard disk drive, instead of simply formatting it. |
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Myth #19 : |
The hard disk drive can only be installed in the horizontal position. |
Truth : |
Current hard disk drives can be installed in any position - horizontal, vertical,
even upside down! |
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Myth #20 : |
If you want to use a hard disk drive in the vertical position, you
must first reformat it in the vertical position! |
Truth : |
Current hard disk drives will work in any position. You do NOT need to reformat
it before using it in vertical position or even upside down! |
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