Which format allows higher compression: *.IMG or *.ISO ?

  • Thread starter Thread starter Frank Callone
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Frank Callone

I want to put (resp. wrap) a directory into a CD image.
The compressability of the directory files is high and I want to compress
all the stuff as much as possible.

Which format should I choose: IMG or ISO ?

Are there tools which allow a higher compression (without creating a *.zip or *.rar
or *.7z archive) ?

Frank
 
Frank Callone said:
I want to put (resp. wrap) a directory into a CD image.
The compressability of the directory files is high and I want to compress
all the stuff as much as possible.

Which format should I choose: IMG or ISO ?

Are there tools which allow a higher compression (without creating a *.zip
or *.rar
or *.7z archive) ?

Frank
Click to expand...

It depends on the data on your disk. Best to run your own test.
 
Someone correct me if i'm wrong, but as far as I know there is no
compression involved in standard ISO/IMG disk images as they are exact
duplicates of the filesystem of the original disk.
Compressed disk images however, are created with a program capable of
crosslinking duplicates within the image to create 'compression'.
One such program called 'cdimage'/'cdimagegui' exists, unsure, but
believe it belongs to Microsoft and is for internal use only.

However, having said that, Google believes MagicISO can do the same.
http://www.magiciso.com/






(e-mail address removed) (Frank Callone) wrote in
 
Frank said:
I want to put (resp. wrap) a directory into a CD image.
The compressability of the directory files is high and I want to compress
all the stuff as much as possible.

Which format should I choose: IMG or ISO ?

Are there tools which allow a higher compression (without creating a *.zip or *.rar
or *.7z archive) ?

Frank
Click to expand...

_Which_ IMG file extension are you referring to? There seem to be a
couple of dozen that fit that description. Since you include it with ISO
you may well be lumping the two together which suggests you mean the IMG
file which is a CD image as is ISO. In that case there is no compression
with either -- they are byte-for-byte copies of what would appear on a
CD. This makes sense since IMG (probably along with its CCD and/or SUB
files) and ISO (which encapsulates the ISO 9660 CD-ROM format) are
typically used as a source to burn CDs.

John McGaw
http://johnmcgaw.com
 
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