Files in.dmg format are easier for Mac users to download and install than other file formats. This document describes how to convert a file saved on a CD or DVD into a.dmg file, and how to burn the.dmg file onto another CD/DVD. Opening Disk Utility. Insert the CD/DVD with the file you want to convert into a CD-burning capable Mac. Open Finder.
Choose Reinstall macOS (or Reinstall OS X) from the Utilities window. Click Continue, then follow the onscreen instructions to choose your disk and begin installation. If the installer asks to unlock your disk, enter the password you use to log in to your Mac.
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Click on Applications, then double-click on the Utilities folder. Double-click on Disk Utility to open the application. Creating a DMG file. In the Disk Utility window, go to the menu on the left and highlight the name of the disk you mounted. Click on the File menu at the top of the screen. From the drop-down menu, click New, then Disk Image From name of your disk. Type a name for your new file, then navigate to the Desktop to save the file there.
Under Image Format, choose compressed. Click Save. You now have a.dmg file saved on your desktop. Next, you can burn the file onto a blank CD/DVD. Burning the DMG file.
Eject the original CD/DVD from the computer and insert a blank one. If you are prompted with a pop-up window, click Ignore. Return to Disk Utility, and click the Burn button at the top of the window. Navigate to the Desktop, and highlight the.dmg file you saved. Click Burn again in the new window to accept default settings. Once the program finishes burning the disk, it will automatically eject.
You should now have a burned CD or DVD with a copy of the original file saved in.dmg format.
As I've said before, for me. At one point, I realized that there were plenty of files on my Mac that I didn't need any more, but too many to delete individually. In other cases, your Mac can be experiencing some major malfunctions: constant crashing, locked controls, slow boot times, missing files, etc. Often, the best option to fix these problems would be to reformat your computer and reinstall your OS, but since most of us don't plan on ever taking this drastic measure, we don't obtain a recovery disc or thumb drive.
Thankfully, the geniuses over at Apple have made the process easy for us—no need for a disc; no need for a drive—all you need is a decent internet connection. With just a few clicks of some buttons and your Mac is gonna be running like it did the day you got it. Best of all, this will work with Lion,. Step 1: Back Up Your Files! Okay, so you may have a lot of files that you want to get rid of, but you definitely have some files you want to keep. In my case, I even have programs I want to keep so I don't have to re-download them after the process is over.
Use a writable CD/DVD, a, or any of the multitude of cloud options to keep your important files backed up. You could also create a Time Machine backup, but I wouldn't do a full restore later—just pick and choose things you want back after a fresh install—otherwise it could run just as sluggishly or erratic as it did before. Step 2: Restart Your Computer Once you've double-, triple-, and quadruple-checked your backups, restart your computer. Step 3: Press CMD+R The second you see a grey screen, hold the CMD and R keys down for about 15 seconds, then let go and you'll be taken to OS X Utilities recovery.
PLEASE HELP!! Whenever I turn on my iMac, it would load up to the apple logo and shut down after a few seconds. This happened ever time i tried to turn it back on again. I had a bit of hope but nothing ever changed so I decided to erase my disk and was immediately promoted me to restart my computer.
When I did, it brought me a a symbol of a folder with a question mark which flashed forever. I held the power button to turn it off and hit it to turn it on again while pressing command and R keys at the same time, it brings me a sign of a spinning globe that loads forever.
When I restart it and immediately insert its installation DVD while pressing key C, it brings me the apple logo and stays like that for ages. This is freaking me out. I have read and tried so may solutions online but nothing has changed. Please help me with another way. In summery, my computer has no files and I won't install a new OS.
So I'm having a slightly different issue. I've followed your steps, but every time I hit 'erase,' it brings up a notice saying: 'Disk Erase failed with the error: Couldn't unmount disk.' I've attached a pic of the error. However, on the left one can clearly see the main '500.11 GB Toshiba MK5,' and below it, the 'Macintosh HD' option. This error pops up ONLY when I try to erase the Toshiba drive. But it allowed me to erase the Macintosh HD option. Has my drive been erased nonetheless?
Or do I still need to do something else? Is all hope lost? FYI: was running Mountain Lion. My original install discs are probably lost for good.