How do I compress a disk image (or DVD)

I have a DVD that's 7.6GB and I want to compress it and save it on my hard drive. It's a concert DVD (copyright protected I'm sure) so I want fairly simple access to it after compression. I made a disk image of the DVD and then saved the disc image to the desktop using Disc Utility. A disc image file that ends with ".CDR" is created and saved on the desktop. I have no problem opening the resulting file (.CDR disc image) and getting it to play in the DVD player or anything like that, however it's still a 7.6 GB file. Is there a way to compress the disc image? I read a post about dragging/dropping the disc image from the desktop into terminal (which I've never even opened before today) and then terminal would automatically compress the disc image. Is this correct? If it is, where is the resulting file (the compressed disc image) then stored? Is this even the easiest way to compress a DVD? Do I even need to make a disc image first, or is there software that will automatically compress the DVD for me and allow my DVD player to open it? It seems like there ought to be an easier way. What am I missing here? I'm not going to save a DVD (or disc image for that matter) that takes up that much space (7.6GB) on my hard drive. Thanks for any help. Michael

Copy protected DVD's (if that is what this one is) make copying difficult by intent. You can try MactheRipper to "rip" it to unprotected form, but please read & heed the caution about the legality of doing so at the developer's web site.
This app may or may not remove any copy protection, since DVD makers understandably sometimes modify their schemes in an attempt to defeat apps like this one. You may also need to make decisions during the ripping process that may affect the way the content plays. IOW, this isn't a 'one-button & your done' sort of thing.
That said, any unprotected DVD can be compressed in various ways by various apps, but you should be aware that compression affects playback quality. Different apps give you greater or lesser control over this & it may well be that compressing the content to a size acceptable to you results in quality that isn't acceptable.
The commercial apps Popcorn & Toast Titanium 7 are probably the easiest to use for this, but that is because they mainly are intended to compress 'jumbo' DVD's down to a size that fits onto regular ones, about 4.7 GB. For better control of compression vs. quality, you will probably have to use more 'geeky' stuff and/or use MactheRipper to discard whatever is least important to you.
If all this sounds like too much trouble, consider investing in more drive space for your .cdr files or just buying extra copies of the DVD's you need to archive.

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Is it possible to compress a disk image to fit on a single layer DVDR

I have created a disk image from one of my iDVD projects and its about 5.7Gb. I was wondering if there is a free program out there to compress the disk image so I can fit it on a single layer DVD-/+R? Thanks in advance for the help!

I don't know much about free software but Roxio Toast has a Fit to DVD option I often use for this same purpose that works rather well.
Also, after searching google, I did find this one link which may help you. I've never used it myself so I'm not completely sure of how well it will work but it may help you.
http://mac.softpedia.com/get/Video/DVDRemaster.shtml
Message was edited by: SDMacuser

How do I create a disk image for windows 7, using a windows computer for USB bootcamp for mac?

Hi There, I have just bought a new 2013 iMac.
Spec: 3.4 GHz intel core i5, 16GB 1600 MHz DDR3 Memory , NVIDIA GeForce GTX 775M 2048 MB Graphics with OS X 10.9.4.
How can I create a 'disk image' from a windows 7 professional 64bit installation DVD using a windows laptop with windows 7 Operating system on? I want to transfer this 'disk image' (ISO?) to a USB ready for installing windows onto my 2013 iMac using bootcamp? I want to use bootcamp from a USB as I have no disk drive for the installation DVD on my iMac. I hope all this is clear.
Thank you. Joe

Yes, that's correct, at least not directly. You can create a blank disk image, copy the file to the mounted disk image, then burn the image to a CD/DVD.
Open Disk Utility and select Blank Disk Image from the New menu. Provide a name, Save location, and select the image size from the drop down menu. Leave Encryptions at None and Format as read/write. Click on the Create button.
After the image file appears the "removable" disk should be automatically mounted. If not double-click on it to mount it. A "removable" disk icon will appear. Drag the file you want to place on the disk image to the "removable" disk icon. The eject the "removable" disk icon. Now select the disk image file in the DU left side list and click on the Burn icon in the DU toolbar. Be sure to have a blank disc ready.
The above is actually the "long" way to do this. A much easier way is to simply insert a blank CD or DVD into the optical drive. The Finder will pop up a dialog asking what to do. Select the option to mount on the Desktop. You will now see a disc icon on the Desktop. Drag the file you want to burn to the CD/DVD, right-click or CTRL-click on the disc icon and select Burn from the contextual menu.
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How can I create a disk image of snow leopard installer disk from my Imac which runs it?

how can I create a disk image of snow leopard installer disk from my Imac which runs it? It came without DVD installer, and I want to make a copy of it's OS installer but can't find out how.

You need to have the disc in order to create disk image of snow leopard installer disc. What did your machine ship with? If something later than SL, then why? If earlier, then you can buy the SL installer disc and make the disk image.

How do I open a disk image made in disk utility?

How do I open a disk image made in disk utility? I made the disk image myself and it won't let me open it.

Right. So did it ever work? did you use it and check it when you created it? not much you can do that I see.

How do I make a Disk image and burn an install Disk

How do I make a Disk image and burn an install Disk, Ive tried it a couple of times, but will not boot up.

Thanks for getting back to me, Yes it does, it came with the machine.
Hi pfhannon,
Does the original Install disk that you are copying,
boot your computer?
You may be successfully making a copy of a disk that
is not suitable for your machine.
regards roam

How can I burn a disk image using disk utility with an external device?

I am trying to burn a disk image on DVD using disk utility in OS 10.3.9.
When I click the 'burn' button only the internal CD-writer appears allthough an external DVD-burner is connected via USB 2.0.
Does anybody have an idea how to make disk utility recognize the external device?

Try installing PatchBurn.
(26583)

How to delete myself built disk image

How to delete self built disk image?

If the image is open (you'll either see the image's disk icon on the desktop or in the left pane of the Finder window) close it. Then put the image in the trash and empty. If you don't close the image it can't be trashed.

How do I mount a disk image that won't open?

I have an external drive Samsung 500 GB that was failing. I think my MacBook Air (10.6.8) caused it to fail because it wouldn't allow me to eject the disk even though I forced quit all programs. I eventually had to just unplug the drive and this caused the external disk to fail as it had not been ejected properly. Not my fault. It's the MBA's fault for not letting me eject the disk. Now the Samsung disk won't mount properly and I get a message that the drive is failing and I should save the data.
Anyhow, I used the free version of Data Rescue 3 to try and save the data on the failing Samsung 500 GB drive and move it onto a brand new Toshiba 1 TB drive.
I was unable to use the normal scanning function of Data Rescue 3 as the hardware of the drive was too damaged, and so I used the clone function on Data Rescue 3 to clone the data onto a non-failing hard drive, with the intent of restoring the data later.
I am not sure if I was successful in making the disk image. It hung up at the 99.6% point for about 12 hours when I decided to give up on it, and I shut down Data Rescue so I could eject the hard disks.
However, it would not let me do it. I tried force ejecting but still I could not eject the disks.
I ended up just unplugging the drives. I think the Samsung drive died almost completely then because it made a whole lot of clicking noises after that (it was only making a few clicking noises before that).
Anyhow, I plugged the Toshiba 1 TB drive into the computer again and used Data Rescue to scan the drive with the disk image on it to see if I could detect files on that drive.
It opened up the structure and I was able to see that most or all of the files were there (abbout 450GB of data) just from seeing the information about the files in the structure tree - the labels of the files (file type labels such as jpg, mp4 etc) and the size of the files, although I could not open up the files to check all of them.
I tested out the restore function of Data Rescue by downloading one file (<10MB) file. I am using the free version and can download one file for free to test things out.
It worked and I was able to save that file onto a second external drive (Western Digital 500 GB) I had plugged in. I had bought this drive just to do the data rescue.
So I think the files are salvageable and the disk image is OK.
However, when I tried to open the disk image in Disk Utility, by opening it as the source and choosing the WD drive as the destination I could not open it. I got an error message. I can't remember what the message was.
I tried just opening the disk image in Finder by just clicking on the disk image but it won't mount.
Is that because my hard drive doesn't have enough space? My Desktop on the MBA only has 12 GB free and the WD drive has only 500 GB on it even though the disk image is about 501 GB.
I don't know why the disk image is that size when the failing Samsung drive only had 450 GB of data on it.
Anyway, what should I do to mount the disk image?
I want to mount the disk image so that I can copy or move the files from it to another external drive so that I can save those files.
Is it because the WD is only 500 GB or does it mean there's a problem with the disk image I made?
Should I try Carbon Clone Copy? I use that to make backups of my MBA internal HDD though I have never used it for opening or making disk images.
I have never dealt with disk images before except for dmg files of applications downloaded from the internet.
I am trying to avoid using Data Rescue 3 as I have to pay for it and if there is a free option, such as Disk Utility, CCC or other, I want to try it to restore the data in the disk image.
Sadly, I think the Samsung drive is ruined beyong repair as it's making a lot of clicking sounds and doesn't mount properly in Disk Image and I get a message that it's beyond repair or something like that in Disk Utility.
So I am relying on the disk image I made on the Toshiba drive to restore my files.
(I think it was the last movie file that caused the problem because it was when I was trying to copy it onto the Samsung external drive, all the problems began - hanging up when copying it, not being able to eject the Samsung disk, causing hardware issues on Samsung disk and getting warning messages on Disk Utility.)
BTW, I learned how to eject a drive when it won't eject the normal way, I have to use command window and type in commands, but that's another post ....
Any advice?
I am thinking of going out and buying a second 1 TB external drive so that I have a disk with enough space to open the 501GB disk image on it, just in case that was the sole problem.
However, I am not sure that is the case, and I think there may be a problem with the disk image or I am not going the right way about opening it.
Thanks for any advice.

I think I've found the solution to this problem.
http://superuser.com/questions/19426/im-unable-to-mount-a-dmg-getting-a-no-mount able-filesystems-error
I am following the instructions here:
I ran into a similar situation. I did what simonair suggested and I received a message in Terminal that Volume mounted successfully. However It did not help me access the mounted Volume neither was I able to confirm the mounted Volume. Nor was I able to mount the image using Disk Drill or even scan through. Nothing succeeded.
Here is what I did to solve my problem. I see that in this post some suggested that we should convert name.dmg to writable file. I used the command from Terminal to convert but was not successful. INSTEAD alternatively, I used Disk Utility, attached the Volume (yes I got the same message again, ''no mountable system files'' however, Disk Utility nevertheless attached the image, which I was able to do before anyways. This time, I selected it and then clicked New image, and then selected image format read/write, not the compressed option. I created a new image. This time this image was writable however, it still would not mount using Simonair's solution. However, this time I was able to scan it with Disk Drill with exact file locations and folder hierarchy as I had. Recovering all from thereon was a breeze. Just remember: when you create new image of an attached volume and chose not compressed but read/write, you need to have a disk with exact amount of space that totals the total space allocated within that name.dmg file (not the amount of space the data takes). Mine was huge, and luckily I had an external disk with enough space to do that and it took about 5 hours for about 400GB of disk allocation. Good luck.
And so far it seems to be working. Even though the volume is grayed out on the left side of Disk Utility, I am still able to select it as the source for making a new disk image. I chose Read and Write and no compression.
The only thing I might be doing differently is that instead of choosing the disk image as the source, I chose the volume as the source. The volume is grayed out, but the disk image is not.
It seems to be working all right. Keep my fingers crossed.
If this doesn't work, I will use Data Recovery 3 as a last resort.

Disk Image on DVD disk. How do I utilize?

I backed up a project on a DVD disk as a disk image. How do I utilize it? I would like to get it into iMovie or iDVD and eventually burned to a DVD?
Thanks

I backed up a project on a DVD disk as a disk image.
If you created a disk image by selecting File>Create Disk Image, you really haven't 'backed up' your project. You 'burned' a completed DVD to a disk image file. This is NOT an archive of your DVD project. Your content has been mpg-2 compressed.
How do I utilize it? I would like to get it into
iMovie or iDVD and eventually burned to a DVD?
If you created a disk image using the File>Created Disk Image route out of iDVD, you can burn it to a DVD by following Burning a disk image on a CD or DVD at http://docs.info.apple.com/article.html?path=DiskUtility/10.5/en/duh1884.html
Please note that to use the mpg-2 content from such a disk image in iMovie, you will need to unencode the mpg-2 back to DV video. There are several programs to do this, but this approach results in lower image quality than just using your original DV video content.
F Shippey

How do I restore a disk image on the startup disk?

Hello,
Where do I begin? Ok, my computer is an iMac and I mainly use OS 10.6.8. I have partitioned the disk into three parts: Snow Leopard, Lion and Tiger ( and I'm thinking of deleting Tiger). The main OS I use on my computer is Snow Leopard (10.6.8). I wanted to try out Yosemite so I upgraded the Lion partition and it soon became Yosemite. I was able to switch back and fort a couple of times last night, but today, when I went to the Startup Disk to go to Yosemite the disk image for Yosemite was gone and it only shows the disk image for Snow Leopard. I did a little research and if I'm not mistaken and read correctly, it indicates that Apple has done away with the disk image for Yosemite? How is one to switch back and forth between systems? Thank you for any insight to my question. -Della
P.S. If I have posted in the wrong category, please feel free to repost in the correct category, but please let me know. Thank you!

If it's a Windows executable file other than a self-extracting zip, you won't be able to open it without installing Windows; on a PowerPC Mac, this requires Virtual PC or the Q emulator.
If it's a self-extracting zip, StuffIt Expander will open it.
If it's actually a disk image, change its extension to dmg or iso and double-click it.
(109118)

How do you create a disk image using Disk Copy?

Hello,
Is there any way you can create a disk image using Disc Copy? Is there a better way to create a Disk Image?
I would like to burn two copies of a 4.2 gig folder on my mac. I usually insert a blank DVD-R and then the mac asks if I would like to prepare it at which point I click "yes". An icon of a DVD disk appears on the desktop and then I drag my files onto this icon. It takes a few moments to create the disc image and then I click "burn". However, after the disc is burned the disc image disappears and I have to start all over again if I want to make another copy.
How can I save this disc image? If I could save the disc image, it would enable me to burn a second DVD right after the first without having to create the disk image all over again. This would save a lot if time.
I am using OS 10.1.5
Thank you for any suggestions

Thanks Niel for the info about creating a Disk Image with the Disk Copy utility in OS 10.1.5
That worked however when I insert a blank DVD-R, the disk image still has to be copied to the DVD-R buffer and then it can be burned. And so this doesn't really save any steps - the "copying into the buffer" step still has to occur whether or not you have created a disk image of your files. So creating a disk image doesn't really shorten the process of burning multiple copies of a DVD.
I will try to describe the steps more clearly:
Two of the three steps for creating a DVD (steps 2 and 3) are very time-consuming:
1. put blank DVD into the drive (a DVD disk icon quickly appears)
2. drag files onto this icon (this step takes a long time as the files are copied into the buffer)
3. choose "burn" (the actual burning also takes a long time)
I was hoping that when I create two or more DVDs of the same files, I could first create a Disk image so that when I create the second DVD, step 2 could be skipped. That does not seem to be the case - the disk image still has to be re-loaded. And so I think I will not bother with the Disk image idea - it doesn't seem to be necessary or helpful when burning DVDs to backup data.
Thanks for your suggestion.

How do you create a disk image of windows so u can increase partition size?

Ok, I have installed windows on my mac using bootcamp so i can play pc games and such. I mainly use the mac side of the computer but I have 30 GB devoted to windows. I ran out of space though and now want to uninstall windows so i can make the windows partition bigger. The problem is that I don't want to have to install ALL of my programs over again once i reinstall windows so I want to take a disk image of windows which i can revert to once it is reinstalled. I tried using the disk utility to do it but it keeps giving me error messages. Does anyone know how do create a disk image using windows??? or maybe I'm doing something wrong with the disk utility??? HELP!

The easiest way I have found to do this is to backup the windows partition with a program such as WinClone
http://twocanoes.com/winclone/
Then use the bootcamp assistant to erase and recreate the partition, finally restoring the backup to the new partition. I have done this several times with my mac and it works great.

How do I create a Disk Image of a FILE?

How do I get Disk Utility to make a .dmg (regular or encrypted) of a single FILE, not a Folder, Disk or Device, without using a third party utility? OR are 3rd party utiities a better choice for Disk Image creation?
I've read all the "Help" info and it only covers creating a .dmg of a Folder, Disk or Device NOT an individual/single file. [Unless I'm blind]
No matter what I do only folders, disks, and devices are highlighted but all files are grayed out during any .dmg creation.
PowerBook G4 Ti 15" (400-MHz) Mac OS X (10.4.8) 1GB RAM, 80MB HD, AE, AEBS

Yes, that's correct, at least not directly. You can create a blank disk image, copy the file to the mounted disk image, then burn the image to a CD/DVD.
Open Disk Utility and select Blank Disk Image from the New menu. Provide a name, Save location, and select the image size from the drop down menu. Leave Encryptions at None and Format as read/write. Click on the Create button.
After the image file appears the "removable" disk should be automatically mounted. If not double-click on it to mount it. A "removable" disk icon will appear. Drag the file you want to place on the disk image to the "removable" disk icon. The eject the "removable" disk icon. Now select the disk image file in the DU left side list and click on the Burn icon in the DU toolbar. Be sure to have a blank disc ready.
The above is actually the "long" way to do this. A much easier way is to simply insert a blank CD or DVD into the optical drive. The Finder will pop up a dialog asking what to do. Select the option to mount on the Desktop. You will now see a disc icon on the Desktop. Drag the file you want to burn to the CD/DVD, right-click or CTRL-click on the disc icon and select Burn from the contextual menu.
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The reward system helps to increase community participation. When a community member gives you (or another member) a reward for providing helpful advice or a solution to their question, your accumulated points will increase your status level within the community.
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How do I delete a disk image??

Oh god, I am a new mac user, and I am so frustrated I want to cry and go back to pc's with my tail between my legs.
I tried to burn a two dvds the other day. They are now on my hard drive, taking up almost 15 freaking gbs and cannot for the life of me figure out how to delete them.
I search for them in finder to delete it, cant find the folder called volumes that is says its in!
i tried to click "erase" while it was highlighted, and it all the buttons are all paled out so i cant click them.
someone help me please, i'm going crazy.

If it's a disk image, try command-E (some say "apple-E") to eject the disk.
Good Luck....

How do I compress a disk image (or DVD)

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