Disk Image
From ITS Wiki - Information Technology Services - University of Rhode Island
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| Disk Image Types International › .ISO Macintosh › .DMG › .CDR Windows › .GHO › .GHS |
A disk image is a file containing not only files and folders but also metadata information, such as filesystem stucture and boot commands. Uses include creating a digital backup of optical media (CD/DVD) or transferring software over the internet.
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Creating a Disk Image
Macintosh
1. Insert the optical media (CD/DVD) into the drive.
2. In the menubar at the top, select Go, then Utilities. Open Disk Utility.
3. Go to File, New, then New Disk Image From ... and select your optical media.
4. Follow the instructions and save a "Master" file. This can be renamed to a .iso image.
Windows
Windows does not natively support iso images. Please consult http://www.daemon-help.com/ and use the provided "ISO Maker Plugin" with the DAEMON Tools Lite application.
Linux
1. Insert the optical media into the drive. Unmount the media.
2. Use the following command, dd if=/dev/cdrom of=/home/me/myimage.iso
of - output file if - input file
Burning a Disk Image
Macintosh
1. Insert blank optical media (CD/DVD) into the drive.
2. In the menubar at the top, select Go, then Utilities. Open Disk Utility.
3. Drag the disk image into the left pane and then highlight it. Click the burn button.
Windows
Windows does not natively support iso images. Please consult http://www.daemon-help.com/ and use the provided "ISO Maker Plugin" with the DAEMON Tools Lite application.
Linux
1. Insert blank optical media (CD/DVD) into the drive.
2. Run, cdrecord -scanbus to determine the drive (i.e. 0,0,0) to burn to.
3. Run the following command, cdrecord -v -pad speed=8 dev=0,0,0 myimage.iso
Using a Disk Image
Macintosh
1. Double-click the .iso file. It will mount on the desktop.
2. To eject, right-click the desktop mount and select, "Eject".
Windows
Windows does not natively support iso images. Please consult http://www.daemon-help.com/ and use the provided "ISO Maker Plugin" with the DAEMON Tools Lite application.
Linux
1. Run the following command, mount -t iso9660 -o loop myimage.iso /mnt/
2. To eject, run the following command, umount myimage.iso
Encrypted Disk Image
An encrypted disk image (.DMG) is a 128-bit or 256-bit encrypted file that, when opened, will prompt the user for a password. Once authenticated, the disk image will mount on the desktop allowing the user to copy data to or from the mounted disk image before unmounting the image to secure it. For more information, please see OS X Encrypted Disk Image.
Related Links:
http://en.wikipedia.org/wiki/ISO_image OS X Encrypted Disk Image
