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How can i fool Windows about a file weight?

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  • Security
  • Windows 7
Last response: in Windows 7
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March 14, 2010 11:35:12 PM

How can i make Windows believe (and so show) that a file is smaller or bigger than it is really? I'm sure some people knows how to make such things, but it must be complicated... Thanks in advance :) 

More about : fool windows file weight

a b $ Windows 7
March 14, 2010 11:38:35 PM

Ya can change date / time but not file size.
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March 14, 2010 11:43:06 PM

You need to read up on NTFS (and FAT) file systems. What you are trying to do is to corrupt the file system. Yes you can do it, but it is not stable.

If you underreport the file size NTFS will recover the unused sectors and the extra data will be lost.
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March 15, 2010 12:58:36 AM

I want to fool it, so it wouldn't tell me there's an error or something... Somewhere on the far internet, an app for doing such thing must exist... Or someone must know how ot do it!
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a b $ Windows 7
March 15, 2010 8:12:42 AM

Goja said:
I want to fool it, so it wouldn't tell me there's an error or something... Somewhere on the far internet, an app for doing such thing must exist... Or someone must know how ot do it!


What exactly are you try to do here? I cannot imagine why you would want Windows to think a file is bigger/smaller than it actually is, unless it's for nefarious purposes.
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a b 8 Security
a c 209 $ Windows 7
March 15, 2010 8:23:33 AM

You can make a file smaller by removing data from it. Open it up in Notepad, delete some stuff from it, then save it again.

You can make a file bigger by adding data to it. Open it up in Notepad, type in a bunch of stuff, then save it again.

Warning - both of these actions may render the file unusable by whatever program normally reads it.
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March 15, 2010 1:11:17 PM

Would there be a legitimate reason for fooling around with the MFT rather than doing the Notepad thing?
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March 22, 2010 1:44:12 AM

Just hidding something
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a b $ Windows 7
March 22, 2010 2:51:25 PM

...a Trojan? Rootkit, perhaps?

We're not going to help you.
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March 25, 2010 10:36:37 AM

I didn't even know what was a rootkit before now, thank your for upgrading my knowledge :lol:  Anyway i will tell you why i need to hide something, what is it, if you can answer. So, do you know how to do that?
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a b $ Windows 7
March 25, 2010 2:18:15 PM

Since there does not seem to any legitiment use for falsifying the size of a file, I do not see any reason for anyone to answer this person's question.

If he is trying to create a trogan / virus / worm, then I'm sure there are more "appropriate" forums for such a question.
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March 26, 2010 2:47:06 AM

Did you even read my last message? I said i will give the reason if someone has the knowledge to do it.
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a b $ Windows 7
March 26, 2010 5:47:13 AM

Goja said:
Did you even read my last message? I said i will give the reason if someone has the knowledge to do it.


OK, sure. So if someone tells you how to do it, how do we know you won't say: "Kthxbye!" and never post here again?
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a b 8 Security
a c 209 $ Windows 7
March 26, 2010 4:04:17 PM

Goja said:
Did you even read my last message? I said i will give the reason if someone has the knowledge to do it.

We're having a hard time understanding why you *wouldn't* be comfortable sharing the reason unless it's chicanery...
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March 26, 2010 4:39:01 PM

this stinks!
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March 26, 2010 9:16:50 PM

robjohnston said:
this stinks!


Sorry, that was me...
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March 29, 2010 6:09:41 AM

I SAID tell me NOT HOW TO DO IT but just YOU KNOW HOW then i will send you a PM and tell you what i wanna do. It's fair, no?
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a b $ Windows 7
March 29, 2010 1:35:00 PM

The answer is 'No'.
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March 29, 2010 3:34:23 PM

Ah the poor guy just wants to hide his porn stash. Just stick with archiving and renaming the files to look like temporary files, or maybe creating a separate partition that you can remove drive letter associations from so that it's "invisible" like the rest of us.
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a b $ Windows 7
March 29, 2010 4:29:18 PM

Goja said:
I SAID tell me NOT HOW TO DO IT but just YOU KNOW HOW then i will send you a PM and tell you what i wanna do. It's fair, no?


actually no, learn how to do it yourself, because like people above have said, there is no reason to need to do this unless you need to hide something
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December 2, 2010 11:12:45 AM

How do you know he didn't find a hidden file on his system (like I just did) which advertised itself as 50Gigabytes smaller than it actually was?
But I guess the point of view here is to not give out information in the remote chance that someone uses it for mischief. Bunch of optimists, all of you. Make the world dumbed down so that the impact of one person with knowledge making trouble is all the worse.
Thanks guys.
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December 3, 2010 8:28:39 AM

vvhocare5 said:
What you are trying to do is to corrupt the file system. Yes you can do it, but it is not stable.

If you underreport the file size NTFS will recover the unused sectors and the extra data will be lost.


There is actually a supported way to do this in NTFS. But if the general opinion in the thread is that there is something strange with the request then I should perhaps not name the feature.
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a b $ Windows 7
December 3, 2010 10:02:57 AM

serbianem said:
How do you know he didn't find a hidden file on his system (like I just did) which advertised itself as 50Gigabytes smaller than it actually was?
But I guess the point of view here is to not give out information in the remote chance that someone uses it for mischief. Bunch of optimists, all of you. Make the world dumbed down so that the impact of one person with knowledge making trouble is all the worse.
Thanks guys.


9-month old thread, this. Why resurrect it?
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a b $ Windows 7
December 3, 2010 8:16:21 PM

serbianem said:
How do you know he didn't find a hidden file on his system (like I just did) which advertised itself as 50Gigabytes smaller than it actually was?
But I guess the point of view here is to not give out information in the remote chance that someone uses it for mischief. Bunch of optimists, all of you. Make the world dumbed down so that the impact of one person with knowledge making trouble is all the worse.
Thanks guys.




50Gigs smaller than it was!!!! ? What sort of files are 50Gig +
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December 5, 2010 12:11:26 PM

mibix19 said:
50Gigs smaller than it was!!!! ? What sort of files are 50Gig +


Few files, but I guess he meant that he had a file where someone had attached a hidden 50 GB part, but Windows reported only the smaller size.
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December 6, 2010 1:06:07 PM

This was on one of the workstations that gets backed up. It was a compressed backup with this property: The packed file size was 52 964 465 753 while actual size was 321. It might just be a glitch. But it took a long time to decompress and shows as 321 on the drive again. The file is named 000000000016d46a. With contents: ‹ ìÏ1JA ÐÑh£ä›Ý5‘ÄÒÄtŠàŠXØ„˜h@LØ]­½ƒ…^E°O À£¸1)A¬å=øóçÏÿ3i¶·»ñq×ë.…PϦ“òr|~QFÇi’Äááu-Ì܆Ÿ‡Y9ɇU‡ÇEÕýoU_A‡§ï-ò~q1Ë>/²/Õ+Bô6ßT–ë£bx3¼*‹³8œ.ò«˜“tºis·Õ‰ZéöfÔl¦íh§×èFIÒÞi·:[f«úßè}Þq½ZYÙÏËÚ~P;ÈNêýé4îN®ÊÙèøpXL®óAÕ6äãi• ãÅÍ• ðO| ÿÿ ž²Â

Might be corruption?
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