Hard Disk Myths and the Truths!

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I found this interesting article that talking about the commonly held myths and the real truths about all our favour needed item, the Hard Disk!


Hard Disk Drive Myths Debunked
The Hard Disk Drive Myth Guide

This guide was written in response to the numerous fallacies about the hard disk drive that are still being propagated in many forum discussions. Although many articles have covered these topics, it is apparent that hard drive urban legends are still more popular than the simple truth.

So, let's get down to basics and examine some of these common fallacies or myths and debunk them!


Myth #1 :
Formatting a hard drive too many times will cause it to fail.

Truth :
To put it shortly, formatting your hard drive will NOT reduce its lifespan. Yes, formatting is popularly thought to reduce hard drive's lifespan but that is nothing more than a myth.

Formatting is NOT a stressful event for a hard drive. The read/write heads do NOT touch the platter surface, so damage to the platter only occurs if there is any shock to the drive during operation.

You can format your hard drive 20 times a day, 365 days a year and it will be no more likely to fail than a hard drive that is not formatted at all.



Myth #2 :
Formatting a hard drive causes a layer of [material / dust] to be deposited on the platter surface, creating bad sectors.

Truth :
Formatting will not deposit any layer of "anything" on the platter. The read/write heads are not in contact with the platters, so it is physically impossible for them to deposit anything on the platter surface.

In addition, the hard drive is a sealed environment assembled under clean room conditions, so there is very little dust inside the hard drive. Even if there is dust, why would formatting deposit anything on the platter? The platters are constantly spinning - any dust would not be able to deposit itself on the platter, much less create bad sectors or an alien colony.



Myth #3 :
Formatting the hard drive will stress the needle (head actuator).

Truth :
Formatting is done contiguously. This means formatting is done in a serial order - sector 500, sector 501, sector 502, etc. There is very little movement of the head actuators. Therefore, formatting will NOT stress the head actuators, which is why you don't see jokes about psychiatrists prescribing Prozac to head actuators.

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I heard repeated formatting makes you go blind..

Does formatting just reset the master boot record or does it actually flip the bits across the entire disk?
 
IIRC a 'quick' format will just blank the file table to make the disk appear empty. A normal format will actually overwrite the disk.
 
So a normal over write will prevent data from being recovered by a hacker or a data recovery company? I primarily ask because I am about to dispose of a pc and I want to ensure no data can be taken from i.
 
So a normal over write will prevent data from being recovered by a hacker or a data recovery company? I primarily ask because I am about to dispose of a pc and I want to ensure no data can be taken from i.

No I have recovered data from disks that have had a full format and then had a re-install done on them..

It is nearly impossible to wipe a disk clean.

One of the best ways is to wipe a hard drive is to use a program called Dban http://www.dban.org/

It takes a while but it is good

:)
 
No I have recovered data from disks that have had a full format and then had a re-install done on them..

It is nearly impossible to wipe a disk clean.

One of the best ways is to wipe a hard drive is to use a program called Dban http://www.dban.org/

It takes a while but it is good

:)

May I suggest you have a go at the Zero Challenge then as linked to in this thread. DBAN is indeed good but if you properly zero a drive then it should be sufficient for most purposes. A quick format is as Mattus suggests, it just blanks the file table so the drive loses the links to the files, it doesn't actually change the data which will continue to be overwritten as and when necessary.
 
nearly impossible to wipe a disk clean.

One of the best ways is to wipe a hard drive is to use a program called Dban http://www.dban.org/

It takes a while but it is good

The best way is to physically destroy the disk. The same principle applies; except this takes a while, is good, and is damned fun! :p
 
IIRC a 'quick' format will just blank the file table to make the disk appear empty. A normal format will actually overwrite the disk.

I don't know about Vista but in XP the only difference between 'quick' and 'full' format is that 'full' runs a total scandisk to check for bad sectors, the actual formatting is the same. If you want to blank a hard disc you could get a tool like DBAN or something.

EDIT: Oh it's been mentioned.

EDIT2: DBAN itself has a quick erase 'zero' mode.
 
IIRC a 'quick' format will just blank the file table to make the disk appear empty. A normal format will actually overwrite the disk.

I thought the only difference between a quick and normal format was that the quick format doesnt scan for errors on the fly.

edit.
Microsoft said:
When you choose to run a regular format on a volume, files are removed from the volume that you are formatting and the hard disk is scanned for bad sectors. The scan for bad sectors is responsible for the majority of the time that it takes to format a volume.

If you choose the Quick format option, format removes files from the partition, but does not scan the disk for bad sectors. Only use this option if your hard disk has been previously formatted and you are sure that your hard disk is not damaged.
 
I was always led to believe the best way to actually prevent data being recovered, is to format, then fill the HDD up with other media etc so it overwrites any trace of the old.

Not that I would ever need to hide anything <_< >_>
 
Myth #1 :
Formatting a hard drive too many times will cause it to fail.

Truth :
To put it shortly, formatting your hard drive will NOT reduce its lifespan. Yes, formatting is popularly thought to reduce hard drive's lifespan but that is nothing more than a myth.

Formatting is NOT a stressful event for a hard drive. The read/write heads do NOT touch the platter surface, so damage to the platter only occurs if there is any shock to the drive during operation.

You can format your hard drive 20 times a day, 365 days a year and it will be no more likely to fail than a hard drive that is not formatted at all.

Wrong. All hard drives have a finite lifespan caused by write cycles, formatting writes to the drive (even if it is only the MFT or FAT) and thus takes the drive that small step closer to hard drive heaven. Format a drive often enough and it will cause it fail just like using the drive will. To say it will NOT reduce the lifespan is misleading.
 
I primarily ask because I am about to dispose of a pc and I want to ensure no data can be taken from i.

I junked some HDDs to recently, my course of action was not to bother with any formatting/software, but simple take a hammer to the PCB on the HDD reducing it to nothing, and then a big whack over the top of the drive with an axe,

so even if they straighten my axe dented platters, and then manage to find the same HDD to nick the PCB from, I don't hold out much hope of useable information being on them any more ;)

A bit OTT perhaps, but FUN :p
 
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