Easy-to-follow video tutorials help you learn software, creative, and business skills.Become a member

Creating disk images with Disk Utility

From: Mac OS X 10.5 Leopard Beyond the Basics

Video: Creating disk images with Disk Utility

When you download a hunk of Mac software, it sometimes arrives in the form of a disk image, which is identified by its .dmg extension. Disk Utility has the ability to create disk images, which can come in handy but how so? Well let's follow along. One of the most immediately useful things you can do with disk images is copy a mounted volume or folder on your Mac. For example, suppose you just got a CD ROM based game for your kid, and that kid is likely to smear it with peanut butter and honey, meaning you have to buy another copy of the disk.

Creating disk images with Disk Utility

When you download a hunk of Mac software, it sometimes arrives in the form of a disk image, which is identified by its .dmg extension. Disk Utility has the ability to create disk images, which can come in handy but how so? Well let's follow along. One of the most immediately useful things you can do with disk images is copy a mounted volume or folder on your Mac. For example, suppose you just got a CD ROM based game for your kid, and that kid is likely to smear it with peanut butter and honey, meaning you have to buy another copy of the disk.

You can create a disk image of that CD and mount it; as far as the Mac is concerned the mounted disk image is the CD so you can safely tuck that disk away from your kid while still allowing him to use it. To this kind of thing insert a CD and select it in Disk Utility, choose File, New, and then Disk Image From and this will be the name of your media drive. In the sheet that appears you have a number of options. You can leave it as compressed, if you are copying a disk and you want to do it bit by bit for example an installation disk of some kind, you might choose DVD/CD Master, this is what I do.

You can also do Read Only, let's try Read Only, and encryption should be none. Click Save, and we will create a disk image on the desktop and now we have our disk image. Now this can take a while, we sped this up so you wouldn't have to sit through the creation process but it maybe a good idea if you particularly have a DVD that you are creating an image from. Start the process, go have a cup of coffee and by the time you come back everything should be ready to go.

Once you have this disk image, you can mount it simply by selecting it in Disk Utility and clicking Open. And here it is. And we drag that into the trash to unmount it or you can simply double click on the image on the Finder. I will skip that, and here it is again. As I said you can also create a disk image from a folder, to do so, choose File, New, Disk Image From Folder, navigate to our Documents folder, let's take this Music folder here and we click Image.

Now here's something interesting that you can do. In the sheet that appears choose Compressed and then one of the encryption options and click Save. You will be asked for a password for this disk image and click OK. Great, so now we have our image, so what good is this? You have now created a compressed image file that requires a password to open.

You can now pass this file along to someone you trust without fears that other people will be able to open it or don't pass it along and keep it as a password protected archive that only you can open. Speaking of password protection, you can use this disk image capability to create password protected virtual and expandable volumes on your Mac and you do it like this. Click the New Image button at the top of the window. In the sheet that appears, enter a name for your archive. In the Volume Size pop up menu, choose the size of the archive you would like, we will make this one 500 megabytes.

From the Encryption pop-up menu choose the kind of encryption that you would like, and from the Image Format pop-up menu choose Sparse Disk Image. Click Create and once again I am prompted for a password so I will enter one. Now note I am going to disable the option to remember password in my Keychain and the reason I do this is because I want this to be encrypted. If somebody sits down on my computer while I am using it if I have wandered away for a bit they come in and they find my image and double click on it, they will be prompted for a password.

If I remember that password in the Keychain this doesn't help me very much if I leave the computer and somebody double clicks on it because up comes the image, because it is in the Keychain and they can access my files, and now I will click OK to create that disk image, and there we are. So at this point I can drag files into this disk image if I like. Once I am finished with it I just drag it into the trash. Now somebody walks up to my Mac later and says, "Oh, your files, let's just check that out" and they double click on it, they are prompted for the password that I have put into the disk image.

Well let's see if we just do share password, how about that? Okay, gee, I still have to enter the password so you can see how secure this is and that's a real benefit to you. Another benefit of this sparse image is that it's expandable. Regular disk images hog all the space you have allotted to them so that if you have created 500 MB image for example, that's how much space it will take up on your hard drive. A sparse image understands that you can have as much space as you have given it if needed but it will tell the Mac OS that it is only as big as the sum of the files in it, and of course thanks to the encryption option, you now have that level of extra protection.

And that's how you create disk images in Disk Utility, up next, burning images.

Show transcript

This video is part of

Image for Mac OS X 10.5 Leopard Beyond the Basics
Mac OS X 10.5 Leopard Beyond the Basics

76 video lessons · 26680 viewers

Christopher Breen
Author

 
Expand all | Collapse all
  1. 2m 34s
    1. Welcome
      2m 34s
  2. 7m 20s
    1. Getting settled into the interface
      3m 47s
    2. Moving more quickly on your Mac
      3m 33s
  3. 18m 44s
    1. Changing languages with the International system preference
      7m 28s
    2. Adding security with the Security system preference
      5m 30s
    3. Configuring a firewall with the Security system preference
      5m 46s
  4. 28m 26s
    1. Adding a Bluetooth device with the Bluetooth system preference
      4m 6s
    2. Configuring your display with the Displays system preference
      6m 46s
    3. Configuring your input devices with the Keyboard & Mouse system preference
      5m 43s
    4. Printing and faxing with the Print & Fax system preference
      8m 15s
    5. Setting the Sound system preference
      3m 36s
  5. 35m 18s
    1. Setting up your MobileMe account with the system preference pane
      8m 36s
    2. Configuring your network connection with the Network system preference
      15m 46s
    3. Sharing your computer with the Sharing system preference
      10m 56s
  6. 41m 33s
    1. Understanding the Accounts system preference
      5m 46s
    2. Creating a new account with the Accounts system preference
      5m 31s
    3. Limiting access with the Parental Controls system preference
      10m 18s
    4. Updating your Mac with the Software Update system preference
      3m 54s
    5. Using Speech
      4m 19s
    6. Changing your startup disk with the Startup Disk system preference
      3m 17s
    7. The Universal Access system preference: The basics
      5m 44s
    8. The Universal Access system preference: VoiceOver
      2m 44s
  7. 33m 14s
    1. Tweaking your account settings
      6m 53s
    2. Organizing and viewing messages
      3m 30s
    3. Filtering mail with Rules
      11m 45s
    4. Importing and exporting mail
      3m 52s
    5. Mail tips
      7m 14s
  8. 14m 2s
    1. Creating complex iCal events
      4m 17s
    2. Publishing and subscribing to calendars
      4m 39s
    3. Importing and exporting calendars
      1m 47s
    4. Expanding iCal
      3m 19s
  9. 18m 55s
    1. Creating complex contacts
      4m 22s
    2. Importing, exporting, and sharing contacts
      5m 10s
    3. Organizing with Groups and Smart Groups
      7m 15s
    4. Printing from your Address Book
      2m 8s
  10. 17m 17s
    1. Doing more with Bookmarks
      3m 27s
    2. Covering your tracks
      3m 26s
    3. Working locally
      3m 54s
    4. Expanding Safari with Saft and PithHelmet
      6m 30s
  11. 54m 3s
    1. Monitoring your computer with Activity Monitor
      8m 31s
    2. Configuring an airport base station with Airport Utility
      4m 10s
    3. Configuring manual settings on an airport base station
      6m 16s
    4. Copying files with Bluetooth File Exchange
      2m 36s
    5. Setting up a partition with Boot Camp Assistant
      2m 36s
    6. Console
      5m 40s
    7. Storing your passwords with Keychain Assistant
      3m 45s
    8. Using keychain access for more than just passwords
      4m 22s
    9. Transferring user accounts with Migration Assistant
      4m 0s
    10. Monitoring your network with Network Utility
      6m 43s
    11. Using System Profiler
      5m 24s
  12. 23m 3s
    1. Understanding Disk Utility
      2m 18s
    2. Verify and repairing with Disk Utility
      3m 14s
    3. Formatting and partitioning with Disk Utility
      4m 28s
    4. Configuring a RAID with Disk Utility
      4m 13s
    5. Creating disk images with Disk Utility
      5m 34s
    6. Burning CDs with Disk Utility
      3m 16s
  13. 18m 18s
    1. Introducing the Terminal
      1m 36s
    2. Essential Terminal commands
      9m 58s
    3. Using the manuals
      1m 20s
    4. More useful Terminal commands
      5m 24s
  14. 7m 9s
    1. Changing permissions
      4m 27s
    2. Enabling the root user
      2m 42s
  15. 19m 18s
    1. Automator essentials
      1m 18s
    2. Creating an Automator workflow
      6m 52s
    3. Mailing images easily
      2m 42s
    4. Creating a timed backup system
      3m 10s
    5. Playing songs randomly from iTunes
      2m 27s
    6. Recording automation
      2m 49s
  16. 16m 13s
    1. Using the Calculator
      3m 16s
    2. Using Font Book
      3m 25s
    3. Importing and managing fonts in Font Book
      5m 1s
    4. Syncing your devices with iSync
      4m 31s
  17. 20m 13s
    1. Keeping your computer healthy
      8m 15s
    2. Using Disk Warrior
      3m 41s
    3. Using Onyx
      8m 17s
  18. 22s
    1. Goodbye
      22s

Start learning today

Get unlimited access to all courses for just $25/month.

Become a member
Sometimes @lynda teaches me how to use a program and sometimes Lynda.com changes my life forever. @JosefShutter
@lynda lynda.com is an absolute life saver when it comes to learning todays software. Definitely recommend it! #higherlearning @Michael_Caraway
@lynda The best thing online! Your database of courses is great! To the mark and very helpful. Thanks! @ru22more
Got to create something yesterday I never thought I could do. #thanks @lynda @Ngventurella
I really do love @lynda as a learning platform. Never stop learning and developing, it’s probably our greatest gift as a species! @soundslikedavid
@lynda just subscribed to lynda.com all I can say its brilliant join now trust me @ButchSamurai
@lynda is an awesome resource. The membership is priceless if you take advantage of it. @diabetic_techie
One of the best decision I made this year. Buy a 1yr subscription to @lynda @cybercaptive
guys lynda.com (@lynda) is the best. So far I’ve learned Java, principles of OO programming, and now learning about MS project @lucasmitchell
Signed back up to @lynda dot com. I’ve missed it!! Proper geeking out right now! #timetolearn #geek @JayGodbold
Share a link to this course

What are exercise files?

Exercise files are the same files the author uses in the course. Save time by downloading the author's files instead of setting up your own files, and learn by following along with the instructor.

Can I take this course without the exercise files?

Yes! If you decide you would like the exercise files later, you can upgrade to a premium account any time.

Become a member Download sample files See plans and pricing

Please wait... please wait ...
Upgrade to get access to exercise files.

Exercise files video

How to use exercise files.

Learn by watching, listening, and doing, Exercise files are the same files the author uses in the course, so you can download them and follow along Premium memberships include access to all exercise files in the library.


Exercise files

Exercise files video

How to use exercise files.

For additional information on downloading and using exercise files, watch our instructional video or read the instructions in the FAQ.

This course includes free exercise files, so you can practice while you watch the course. To access all the exercise files in our library, become a Premium Member.

Are you sure you want to mark all the videos in this course as unwatched?

This will not affect your course history, your reports, or your certificates of completion for this course.


Mark all as unwatched Cancel

Congratulations

You have completed Mac OS X 10.5 Leopard Beyond the Basics.

Return to your organization's learning portal to continue training, or close this page.


OK
Become a member to add this course to a playlist

Join today and get unlimited access to the entire library of video courses—and create as many playlists as you like.

Get started

Already a member?

Become a member to like this course.

Join today and get unlimited access to the entire library of video courses.

Get started

Already a member?

Exercise files

Learn by watching, listening, and doing! Exercise files are the same files the author uses in the course, so you can download them and follow along. Exercise files are available with all Premium memberships. Learn more

Get started

Already a Premium member?

Exercise files video

How to use exercise files.

Ask a question

Thanks for contacting us.
You’ll hear from our Customer Service team within 24 hours.

Please enter the text shown below:

The classic layout automatically defaults to the latest Flash Player.

To choose a different player, hold the cursor over your name at the top right of any lynda.com page and choose Site preferencesfrom the dropdown menu.

Continue to classic layout Stay on new layout
Exercise files

Access exercise files from a button right under the course name.

Mark videos as unwatched

Remove icons showing you already watched videos if you want to start over.

Control your viewing experience

Make the video wide, narrow, full-screen, or pop the player out of the page into its own window.

Interactive transcripts

Click on text in the transcript to jump to that spot in the video. As the video plays, the relevant spot in the transcript will be highlighted.

Are you sure you want to delete this note?

No

Your file was successfully uploaded.

Thanks for signing up.

We’ll send you a confirmation email shortly.


Sign up and receive emails about lynda.com and our online training library:

Here’s our privacy policy with more details about how we handle your information.

Keep up with news, tips, and latest courses with emails from lynda.com.

Sign up and receive emails about lynda.com and our online training library:

Here’s our privacy policy with more details about how we handle your information.

   
submit Lightbox submit clicked
Terms and conditions of use

We've updated our terms and conditions (now called terms of service).Go
Review and accept our updated terms of service.