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Question about MBR


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#1 Strained to See

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Posted 30 March 2016 - 07:29 PM

I'm the easily paranoid type when it comes to viruses and trojans. I wanted to know if there are extra steps you would have to take to reset the MBR or does a windows reinstall take care of that. My computer is fine atm, mainly asking so I know what to do if something ever happens in the future.

 

-Also forgot to ask, if you make a system image using window's backup does it also backup the MBR?



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#2 ScathEnfys

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Posted 30 March 2016 - 08:49 PM

A complete, clean reinstall of Windows from a CD/DVD/USB will completely and irrevocably erase all data on the target hard drive. This includes the MBR.

By "Windows Backup" do you mean system restore?
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#3 TsVk!

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Posted 30 March 2016 - 09:48 PM

 

-Also forgot to ask, if you make a system image using window's backup does it also backup the MBR?

Yes with "system image", no with system "restore points".


Edited by TsVk!, 30 March 2016 - 09:58 PM.


#4 TsVk!

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Posted 30 March 2016 - 09:55 PM

 

A complete, clean reinstall of Windows from a CD/DVD/USB will completely and irrevocably erase all data on the target hard drive. This includes the MBR.

Not quite. It will destroy the partition tables, create new ones and write new data to the disk. The old data still exists but it is not referenced anywhere on the disk.

 

The new installation will then start writing over the data that is not visible. The new installation will not be able to see any of the old data. Much data will be destroyed in the writing/installation process, but there will be many files that could be retrieved using applications like TestDisk.

 

The way to irretrievably destroy all the data (apart from physically destroying the disk) is to rewrite the disk with random data. A good example of an application that does this is DBAN.



#5 ScathEnfys

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Posted 30 March 2016 - 09:58 PM

Not quite. It will destroy the partition tables, create new ones and write new data to the disk. The old data still exists but it is not referenced anywhere on the disk.
 
The new installation will then start writing over the data that is not visible. The new installation will not be able to see any of the old data. Much data will be destroyed in the writing/installation process, but there will be many files that could be retrieved using applications like TestDisk.
 
The way to irretrievably destroy all the data (apart from physically destroying the disk) is to rewrite the disk with random data. A good example of an application that does this is DBAN.

True, but considering the OP wasn't concerned with permanently erasing data I didn't want to get into technicalities like that. The important part is that the MBR will no longer be usable.
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#6 TsVk!

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Posted 30 March 2016 - 10:04 PM

Not having a go at you mate, just trying to avoid any confusion.



#7 TwinHeadedEagle

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Posted 31 March 2016 - 05:50 AM

MBR is always in the first sector on every disk. As soon as you create system partition, new MBR will be written in first sector.


Edited by TwinHeadedEagle, 31 March 2016 - 06:34 AM.


#8 ScathEnfys

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Posted 31 March 2016 - 10:19 AM

Not having a go at you mate, just trying to avoid any confusion.

I wasn't either :) thanks.


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#9 Strained to See

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Posted 31 March 2016 - 02:40 PM

Thanks everyone, I don't think I have anymore questions about this. You guys answered all of them :).



#10 ScathEnfys

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Posted 31 March 2016 - 03:59 PM

Glad we could help :)
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#11 TsVk!

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Posted 31 March 2016 - 06:32 PM

:busy:



#12 JohnnyJammer

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Posted 31 March 2016 - 10:59 PM

Well stepping this up a notch, the outer most side of the disk platter / platters are where the MBR is written (First 512 sector), this is why the old "My PC is so fast now i formatted" comes from because the disk spins and there for data is read faster at the outer edges. The the $MFT comes into play!

Now once the drive fills up, the data is written from the out side in and when its getting full the pc may become a little slower!






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