How do You "unmount a disk"?

I have a G4, with 3 Hard Drives, OS Tiger. One drive give this error message when you use the Utility to verify the disk -
"Verify volume failed with error Could not unmount disk"
I've tried the widget, to no avail
please reply
gfclef

You need to burn the disk image to the DVD disk.
1 - mount the disk image by double clicking on it.
2 - launch Disk Utility
3 - in the side pane select the .img part of the disk imge in the side pane.
4 - click on the Burn button.
Follow this workflow to help assure the best qualty video DVD:
Once you have the project as you want it save it as a disk image via the File ➙ Save as Disk Image  menu option. This will separate the encoding process from the burn process. 
To check the encoding mount the disk image, launch DVD Player and play it.  If it plays OK with DVD Player the encoding is good.
Then burn to disk with Disk Utility or Toast at the slowest speed available (2x-4x) to assure the best burn quality.  Always use top quality media:  Verbatim, Maxell or Taiyo Yuden DVD-R are the most recommended in these forums.
OT

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