ShowpiZ Press

Did it ever happened to you?
You download some hefty bootable disk image file, burn it on DVD following all instructions religiously, but... your Mac simply refuse to boot from new DVD?

Here is very simple solution which worked marvels on my MBP:

Do not open disk image file (.dmg for instance) !
If you do so without Locking the file first, you are busted.

• Right click on downloaded disk image file, use "Open with... Disk Utility" tool dialog;
• Disk Utility tool will open up with desired disk image file in the Left Panel;
• Select that Image file from Left Panel and use "Burn" button find in the top menu.
• Stick with Default options when burning your bootable DVD;
• Perhaps it is safer to use low writing speed,especially if DVD media brand is not so good.

If you still want to see .dmg file content, before mounting disk image
Lock the File first , using Right Click >Get Info>Lock File dialog.