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DBAN/Killdisk type programs


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#1 dishdude1

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Posted 04 November 2016 - 01:44 PM

I have a hard drive I wiped to redeploy on a different OS, nothing critical on it but I want to make sure all the partitions are wiped so I have a clean HD to install on. It's a 160 GB drive but the programs are telling me it is 149 GB. Is there a hidden partition that these programs are missing?



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#2 JohnC_21

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Posted 04 November 2016 - 02:09 PM

This is normal because the OS is binary and not decimal. Manufacturers use 1000kb to a MB but it's actually 1024kb to a MB in binary.

 

1024 x 1024 x 1024 = 1073741824 bytes in a GB using binary.

 

1000 x 1000 x 1000 = 1000000000 bytes in a GB using base 10

 

1000000000/1073741824 =  .931

 

.931 * 160 = 149GB

 

http://www.ussscctv.com/harddrivesizecapacitiescalculator.aspx



#3 cat1092

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Posted 05 November 2016 - 04:43 AM

Yes, it's unfortunate that these OEM's gets by with this, yet it's been the rule ever since I can remember, even with the smaller HDD's of 15-16 years back. When having a 40GB HDD was a big deal, now 1TB drives are a given on many computers with 2TB sizes now being widely deployed by OEM's. Yet the user ends up with only 931GB of usable space on a 1TB HDD. 

 

So whatever you're using is reporting correctly, as JohnC has pointed out. :(

 

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#4 dishdude1

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Posted 05 November 2016 - 05:13 AM

Interesting, I had no idea. Am I correct to assume these programs don't recognize partitions and simply write over the entire drive?



#5 JohnC_21

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Posted 05 November 2016 - 08:47 AM

Interesting, I had no idea. Am I correct to assume these programs don't recognize partitions and simply write over the entire drive?

Correct, the programs zero wipe the disk and could care less what partitions are on the drive. There are some areas of the disk that the programs do not touch but that is something most people do not need to worry about.

 

https://www.technibble.com/are-we-completely-wiping-that-hard-disk/

 

If the drive supports it you can use the SecureErase command. The utility in the article is for ATA drives and I am not sure it will work for SATA. There a version on Parted Magic, $9, but there are risks so I would leave well enough alone and wipe the drive with DBAN.


Edited by JohnC_21, 05 November 2016 - 08:57 AM.


#6 RolandJS

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Posted 08 November 2016 - 01:06 PM

Every OS has housekeeping that is put i place during a formatting of the HD, no matter quick or full, that also accounts for the difference between the "raw" total byte-space and usuable byte-space.


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