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mtobc 
Group: Members
Posts: 2
Joined: Jan. 2010
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Posted on: Jan. 29 2010,01:22 |
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So...I came across two .iso files that have the exact same number of bits, however they contain slightly different content. This made me curious.
Can .iso files be created to a target size, regardless of their actual content?
Can UltraISO be used to specify a target size?
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xoben
Group: Super Administrators
Posts: 2200
Joined: Nov. 2004
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Posted on: Jan. 29 2010,02:35 |
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Sorry, it is not possible to do so.
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| Post Number: 3
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mtobc
Group: Members
Posts: 2
Joined: Jan. 2010
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Posted on: Jan. 29 2010,02:55 |
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Thank you for the reply.
Do you mean, not possible in UltraISO or impossible all together?
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| Post Number: 4
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ThetaSigma
Group: Members
Posts: 1
Joined: Feb. 2010
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Posted on: Feb. 09 2010,00:37 |
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If a file is 3,300,000 bytes in size, it will always be that size unless you either modify the actual content of the file or compress it with a compression utility such as WinRAR, WinZIP, etc. before burning it (or a codec in the case of audio/video).
However, keep in mind that many file types will benefit very little or not at all from compression. This is particularly true for images & video since they are already compressed and can rarely be compressed any further (a few kilobytes of size reduction at best).
For example, JPEG is a compression method used to compress raw image data, AVI is a container containing audio & video that (in most cases) has already been compressed with an audio/video codec such as Xvid, DivX, AC3 etc. Since they have already been compressed, further compression using a utility such as WinRAR is pointless from a file size viewpoint.
In other words, it is physically impossible to decrease the size of a file while retaining the original content without some form of compression. Furthermore, whether or not you will benefit from compression depends entirely on the particular file type & content you are working with.
Edited by ThetaSigma on Feb. 09 2010,00:49
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