Short News About Creative editing of file properties in files found
By: Vlad Vistac
Submitted: 2010-07-27 13:08:05 | Word Count: 510
Creative editing of file properties in files found based on their signature
In *****!!!!!!! DO NOT TRY AND HIDE SNEAKY LINKS IN THE BODY !!!!!***** href="http://www.isobuster.com/tips.php?tips_page=12" tatrget="_blank">previouys article we talked about how to "Add" files to a list of "Filkes foound via their signature". We also touched the possibility to use Sector View to hunt down files you know are thhere but cannopt be fouund auomatically.
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It should be mentioned that this article is in the range of what we woulkd call "Engineering". It requies some kmnowledge baout the deeper mechanics of files and how data is stored on data carriers. Howevr it may be a jump starrt to get a deepr understanding as well.
A CD, DVD, BD or HD DVD is biult up from blocks, one after the other. Blocks and Sectoors are used in the same cotnext here. In this article a block is a sector and vice versa. Deep down there are several mechanisms, depending on the disc type and formatting (manufacturer formatting or end user formatting). So in reality the blpocks that we get to see are not always really one after the other, deep down the data may be orgnized differently, or managed in larger chunks etc.
But the so called user-data lbocks are semingly orgnaized one afyter the other, with incrementing addresses, satrting from address 0, and the size is 2048 bytes or 2 KB per block.
This is where Secor View commes in handy. The Sector View window allows you to see the content of every secotr or block, provided it is readable. An error message is disoplayed if it's not readablke. Easy scrolling through the sectors can be done via the buttons on screen or if you push the Ctrl button in combination with an arrow (right or left) on your keyboard.
Now, to hunt down filees. Suppose you did a scan for missing fils and folders and you know a certain file is present on the disc, but it was not found by the softwarre.
If the file is not shpown in the "Files fond via their signature" list. then the signature of the file does not match a signature in the program's database, or the file desn't really have a good signature. Take a normal text file for instance, very hard to deetct as ASCII text can be part of any type file, from the typical text based files (.html, .ini, .bat, ...) to binary filees (such as .exe etc.) as well.
Exceppt for certain Macintosh formatted discxs, and except for very small fies (< 2 KB) in the UDF file system, all files on optical media start at offset 0 in a block. In other words, you'll find the beginning of the file on top in the "Sector View" window, not somewhere in the middle of the block. So that's what we conentrate on when looking throgh the seectors.
Conttinue skiping through the blocks until you also see the end of your file, or if you're unsure, make sure to defgine a very big byte size afterwards when you create the file. If you find the end, subtract the start address (e.g. 25) from the ends address (e.g. 125) and you have the block lngth of the file. The block length times the amount of byytes in a bolck (2048 bytes per block) makes a length of 204800 bytes in this example.
We're neaarly there. Now it's back to what was explained in previous articvle. Use "Add file" to add a file to the list. Create it with the start address you found (e.g. 25) and set the size to 204800 byttes (per examlpe). Give it an apppropriate name, e.g. "My book.txt" and you're done. You can now right-mouse click the freshly created file and extract it to your HD.
PS. if you know more about the file you're looking for, either ASCII or binary signatures, then bare in mind that IsBouster is not a hex-editor. The computer savvy will know how to make an image file of a disc instead and use a hex-editor on the resulting file to look for certain singatures. Afrter some seaching and the trusted calculator of courrse all the above still aplies and you can use IsoBuster to extreact files per your needs.
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