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Old 01-13-2003, 08:22 PM   #1
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What is an ISO image?

What is an ISO image? I can't find anything that defines
what it is, what it does, and how it's used.
Old 01-13-2003, 08:35 PM   #2
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It's an image file containing many files, similar to a zip file. iso's are usually used to create bootable cd's.

Old 01-13-2003, 08:38 PM   #3
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Usually it's a copy of an entire CD in a file that can be used to pretty much exactly recreate the original CD.

# dd if=/dev/hdd of=filename

Would create an ISO image of /dev/hdd assuming that's the device of a CD-ROM to file "filename". Various Linux CD burning software can burn them back to a CD for you or even Windows apps like EZ CD Creator or NERO, etc... Generally this method copies tracks and sectors and cares not about filesystems. A Windows PC can copy a Linux CD this way even if it knows nothing about Linux (ISO 9660 CD format is compatible with both OSes).
Old 01-13-2003, 08:41 PM   #4
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The universal standard filesystem for data CDs.

The word ISO is commonly used to refer to the iso9660 standard. Different vendors have implemented extensions to the standard ( High Sierra, Rock Ridge, MS Joliet to name a few )

More info at :

The best way to store a CD filesystem in your hard-disk is to make an iso image of it ( one file - max size 670 MB or so ) . This makes it convenient to lay it on a fresh CDROM should the need arise. Most Linux installations are distributed as ISO images that you can download and burn to CDs.
Old 01-13-2003, 10:04 PM   #5
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OK, I get the idea. Thanks , all.


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