Difference between revisions of "Tutorials:Calculating Hash Sum"

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<br/><font size=6px><center>Introduction</center></font><br/>
 
<br/><font size=6px><center>Introduction</center></font><br/>
This guide will help to confirm you have exact copies of '''UBCD''' ISO to prevent any problems later down the road. This should be your <u>FIRST</u> step before continuing with any of the other [[Tutorials]] regarding the ISO. Compare with [http://www.ultimatebootcd.com/download.html Download Page] MD5 Sum. If you would like more information regarding Checksums/Hashsums please see the [http://en.wikipedia.org/wiki/Checksum Wikipedia article].
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This guide will help to confirm you have exact copies of '''UBCD''' '''ISO''' to prevent any problems later down the road. This should be your <u>FIRST</u> step before continuing with any of the other [[Tutorials]] regarding the '''ISO'''. If you would like more information regarding Checksums/Hashsums please see the [http://en.wikipedia.org/wiki/Checksum Wikipedia article].
 
 
<br/><i>NOTE: If you can download through the torrent instead of HTTP/FTP, it can prevent you from having to check the ISO Checksum/Hashsum as it auto-checks the ISO; thereby safely disregarding this article.</i>
 
  
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<br/>'''<font color=red>DISCLAIMER: The only <u>trusted</u> MD5/SHA1 Sums are located on the [http://www.ultimatebootcd.com/download.html downloads page].</font>'''<br/><br/>
  
 
== Windows ==
 
== Windows ==
*1. Freeware programs: [http://www.softpedia.com/get/Security/Security-Related/HashCalc.shtml Hashcalc] (Requires installation) or [http://www.arpoon.de/checksum.html Checksum] (No installation required). More options from this [http://www.softpedia.com/hubs/Checksum-Verifiers?sort=downloads Softpedia list] (Some freeware, may require installation).
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*1. Freeware programs: [http://www.softpedia.com/get/Security/Security-Related/HashCalc.shtml Hashcalc] (Requires installation) or [http://www.arpoon.de/checksum.html Arpoon Checksum] (No installation required). More options from this [http://www.softpedia.com/hubs/Checksum-Verifiers?sort=downloads Softpedia list] (Some freeware, may require installation).<br/><br/>
 
   
 
   
*2. After installation, drag '''ISO''' onto program (or desktop shortcut) and it will auto generate the MD5 Sum.
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*2. After installation (or extraction for portable), drag '''ISO''' onto program (or desktop shortcut) and it will auto generate the MD5 Sum. Compare with [http://www.ultimatebootcd.com/download.html download] page MD5/SHA1 Sum.<br/><br/>
  
 
== Linux ==
 
== Linux ==
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*1. First open a terminal and goto the directory you downloaded the '''ISO''' into:
 
*1. First open a terminal and goto the directory you downloaded the '''ISO''' into:
  
       <pre>cd download_directory</pre>
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       <pre>cd download_directory</pre><br/>
  
 
*2. Then run the following command from within the download directory.
 
*2. Then run the following command from within the download directory.
  
       <pre>md5sum UBCD###.iso</pre>
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       <pre>md5sum UBCD###.iso</pre><br/>
  
 
*3. md5sum should then print out a single line after calculating the hash:
 
*3. md5sum should then print out a single line after calculating the hash:
  
       <pre style=size="12">HASH_SUM_HERE UBCD###.iso</pre>
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       <pre style=size=\"12\">CHECKSUM_HERE UBCD###.iso</pre><br/>
  
 
<nowiki># = version number</nowiki>
 
<nowiki># = version number</nowiki>
  
 
= Checksum/Hashsum Doesn't Match? =
 
= Checksum/Hashsum Doesn't Match? =
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Your options are:
 
Your options are:
  
*1. Re-download. Delete the '''ISO''' and download again. Probably the easiest option that will work for everyone, only problem is on a slow connection could take forever (again). <i>NOTE: If after downloading the '''ISO''' several times from same location and the '''ISO''' still doesn't match, please report the Mirror on the [http://www.ultimatebootcd.com/forums/ Forums] and try another location.</i>
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*1. Re-download. Delete the '''ISO''' and download again, this time try choosing another mirror. Probably the easiest option that will work for everyone, only problem is on a slow connection could take forever (again).<br/><br/>
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*2. Torrent. By only downloading the missing pieces to complete the '''ISO''', could save you valuable time and thus be faster than re-downloading the whole '''ISO''' again. This is more complicated than just downloading a file, therefore, only proceed if you are experienced with torrenting:
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<br/>'''<font color=red>DISCLAIMER: The only <u>trusted</u> torrent files are located on the downloads page.</font>'''<br/><br/>
  
*2. Torrent. If you can, fastest way to get the correct copy, but more complicated, is to open the torrent file in your favorite Bittorent program and start the download. Then <u>stop</u> the download, and copy the mismatched '''ISO''' to the download/temp location, overwriting the torrent download '''ISO''', and force the program to re-check the file. If everything went as planned, the program will automatically download missing pieces needed to complete the '''ISO'''.<br/><br/>
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*2a. Open the torrent file, located on the [http://ultimatebootcd.com/download.html downloads] page, in your favorite Bittorent program and start the download.
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*2b. Then <u>stop</u> the download, and copy the mismatched '''ISO''' to the download/temp location, overwriting the torrent download '''ISO'''.
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*2c. Followed by forcing the program to re-check the file. (See picture)
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<br/><br/>
 
[[Image:uTorrent-Picture1.jpg|400px|center|frameless]]
 
[[Image:uTorrent-Picture1.jpg|400px|center|frameless]]
<center>Shown is uTorrent (freeware) and right clicking on the torrent to "Force Re-Check".</center>
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<center>Shown is uTorrent (freeware) and right clicking on the torrent to \"Force Re-Check\".</center>
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<br/><br/>
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*2d. If the '''ISO''' is anything less than 100%, you will have to press the \"play\" or \"start\" button to continue downloading the rest of the '''ISO'''.
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*2e. After the file reaches 100%, check the MD5/SHA1 checksum codes of the '''ISO''' image using the instructions [[Tutorials:Calculating_Hash_Sum#Windows|above]] to confirm.
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<br/><br/>''Note: There are many different Bittorent programs, please see documentation for your program if you are having issues.

Latest revision as of 17:01, 18 November 2012


Introduction

This guide will help to confirm you have exact copies of UBCD ISO to prevent any problems later down the road. This should be your FIRST step before continuing with any of the other Tutorials regarding the ISO. If you would like more information regarding Checksums/Hashsums please see the Wikipedia article.


DISCLAIMER: The only trusted MD5/SHA1 Sums are located on the downloads page.

Windows

  • 2. After installation (or extraction for portable), drag ISO onto program (or desktop shortcut) and it will auto generate the MD5 Sum. Compare with download page MD5/SHA1 Sum.

Linux

Ubuntu and similar flavors:

  • 1. First open a terminal and goto the directory you downloaded the ISO into:
cd download_directory

  • 2. Then run the following command from within the download directory.
md5sum UBCD###.iso

  • 3. md5sum should then print out a single line after calculating the hash:
CHECKSUM_HERE UBCD###.iso

# = version number

Checksum/Hashsum Doesn't Match?

Your options are:

  • 1. Re-download. Delete the ISO and download again, this time try choosing another mirror. Probably the easiest option that will work for everyone, only problem is on a slow connection could take forever (again).

  • 2. Torrent. By only downloading the missing pieces to complete the ISO, could save you valuable time and thus be faster than re-downloading the whole ISO again. This is more complicated than just downloading a file, therefore, only proceed if you are experienced with torrenting:


DISCLAIMER: The only trusted torrent files are located on the downloads page.

  • 2a. Open the torrent file, located on the downloads page, in your favorite Bittorent program and start the download.
  • 2b. Then stop the download, and copy the mismatched ISO to the download/temp location, overwriting the torrent download ISO.
  • 2c. Followed by forcing the program to re-check the file. (See picture)



UTorrent-Picture1.jpg
Shown is uTorrent (freeware) and right clicking on the torrent to \"Force Re-Check\".



  • 2d. If the ISO is anything less than 100%, you will have to press the \"play\" or \"start\" button to continue downloading the rest of the ISO.
  • 2e. After the file reaches 100%, check the MD5/SHA1 checksum codes of the ISO image using the instructions above to confirm.



Note: There are many different Bittorent programs, please see documentation for your program if you are having issues.