About disk images

How do disk images work?
When you select a size for a disk image in Disk Utility does it always take up that much space or is that just the limit?
What's the difference between sparse and read/write encrypted disk image?
Can either of these formats be opened in Windows, including non-encrypted ones?
Thanks

1. When you set a size for a disk image that is the amount of space reserved for the image file. It will take up slightly more than that on a hard drive because of the directory overhead. You can store slightly less than the reserved space also due to directory overhead.
2. A sparse image, unlike a regular disk image, is created with an allocated maximum storage space but will occupy less space on the hard drive. The size of the image file will grow as more data are "written" to the image file. When File Vault creates an encrypted Home folder it does this be moving the Home folder to an encrypted sparseimage disc. Thus, a File Vault protected Home folder can increase in size to accommodate new files.
3. An encrypted disk image is just that. A disk image that is encrypted and requires a password for access to its contents. A read/write disk image is one on which you can add or remove content. A read-only image is one that once you have written to it you cannot change it.
4. Mac formatted devices (including disk images) cannot be read on PCs without special software. However, a standard disk image that is not restricted to only the Mac disk format will contain alternative filesystems that are readable on PCs.
Open Disk Utility and select Disk Utility Help from the Help menu. Search for references to disk images for more complete information.
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Similar Messages

  • Question about Disk Image Backup/Restoring

    Ok, so i have a weird Boot Camp error that requires reformatting of my whole drive. Now I have thought up a procedure that I think will work, let me know if this is a viable option:
    1: Hook up a 320GB External Firewire Drive
    2: Boot up using the 10.6 DVD
    3: Go into Disk Utility
    4: Make an image of the Macintosh HD and save it to the External Drive
    5: Format the Macintosh HD
    6: Restore the Macintosh HD using the Image
    If i do this, will everything be hunky dory? Nothing is wrong with this? Thanks!

    Copy the content of the external to the internal--into an appropriately named folder. Then, clone your internal to the external. I would just use DU. First, use DU to partition the external GUID--which also will format it OS X extended (journaled). You might want to make two partitions if you have room (see below). To clone, go to the restore tab; select your internal volume and drag it to the source box. Then, select your external and drag it to the destination box. Then, click restore. If you can't perform the operation without previously selecting erase distination, then select it; let DU erase again; and then click restore.
    In an hour, more or less, you'll be ready to take care of your internal drive issue. Piece of cake. When you have fixed the internal, then just clone you Sno install on the external back to the internal. If you made two partitions, then copy the original external data to the second partition and remove it from your Sno installs if you want.

  • I run OSX10.6.8. Just dwnlded FF8.1 and everytime I go to open it I am asked about the disk image. But if I delete the dmg, the program won't run.

    I just downloaded the 8.1 version. It was a 30+mb file. Previously I ran 4.0. So I drag the new Firefox icon into the Apps folder. It does its merge thing with the old version. Problem is when I click to open FF now, it always throws up this window asking me about the disk image of what I just downloaded. I even tried restarting the computer--but the same message pops up. I checked on your website and it says that I need to "eject" the disk image (i.e. I'm guessing that means the 30+ mb file I just down loaded), so since I don't have an eject option that I can find (except for external harddrives and cd/dvd), I just drug it into the trash. I go to empty the trash and I get a message that that dmg file is "in use" even though FF is completely shut down. So again I'm guessing that means that even though I already merged that dmg file with the old 4.0 version file, if I dump the update file it seems that it's going to mess up the actual revised program file still remaining. I just want to be able to click on the icon in my dock like I've always done and have FF open. I don't want to keep being asked about disk image stuff. Somehow this feels like an easy resolution, but I just can't seem to put my finger on how to resolve it. Thanks for you help.

    Nope---didn't work. I've owned Macs for about 12 years so although I am brain dead on some things, I do have a working knowledge on most things. I only say that to say this--I did try holding down the mouse and choosing empty trash. It asks if I want to permanently delete what's in there. I say yes--and then I get the same identical message again-----'The operation can't be completed because the item "Firefox 8.0.1.dmg" is in use I can then click stop, or continue.' So apparently that complains the same way it does if I click it up on the menu :)))
    As for item owned by---that's not an issue and isn't coming up. User is not a problem either as I am the only user on this system. There is only ONE file in my trash at the moment at that is this dmg file. Nothing Mac. Nothing owned by anyone other than Firefox. The problem seems to be that the dmg file and the original 4.0 FF file are working in tandem with each other--even though I have already drug the new 8.0 globe into the Apps folder and it updated the FF app with the new stuff. If I could force the dmg file to go away, I would do so, but at every turn the system is telling me it can't be done because it seems to think that dmg file is in use---even though everything is shut down and/or ejected. Hey--I'm getting ready to head out and won't be back till evening. I'll check back in this evening. Thank you again for your help.

  • Using disk images for learning games?

    Hello, I've 2 g3 imacs running 9.2.2, and they are for the grandkids to use learning games on.
    The kids are very hard on the software disks. When I found out about disk images I made them up, now to install them properly. The games are installed, but where to store the disk images? The desk top icons for the games will work after the disk images have been double clicked and the mounted disk image appears on the desktop, but when the imacs are turned off the mounted disk image is lost. How or where does one put the disk images in a safe place so the kids don't get at them, and the disks are mounted every time, without actually starting, when the Mac is started? Start up menu?
    I'm planning on multiple accounts with them having a standard account with game privileges so they don't mess the whole thing up. If their accounts get too messed up for me to repair I figured on maybe deleting the account and opening up a new one? Any Ideas are very welcome.
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    Hi, EZ -
    You're quite welcome.
    I had a thought with regard to the disk image files. Are they in a .smi format, or are they in a .img format?
    The .img format requires the assistance of the Disk Copy utility in order to mount the image. This is the standard format generated by the user version of Disk Copy. It requires that Disk Copy be available to Finder to act as a helper app in order to mount the image.
    The .smi format does not - .smi stands for Self-Mounting Image. The user version of Disk Copy can not make this format; but I have seen a utility to convert .img format to .smi format. The slight advantage with this format is that Disk Copy does not need to be available to Finder.
    In both cases the default is to run a checksum verification before the image is finally mounted. The delay caused by this verification can be inconvenient - verification is intended to confirm the integrity of the image after it has been copied, transported, or downloaded, but is usually not necessary when the image resides on a hard drive.
    The checksum verification for .img file types can be removed. With the image not mounted, open Disk Copy. In Disk Copy's Preferences (Edit menu), uncheck the Verify Checksum item. Save the Preferences window. Then select Convert Image from the Image menu, navigate to the disk imge file from which you want to remove the verifiaction, select it and click the Open button. A new window will appear, similar to a Save As type window. Leave everything in that window untouched (unless you want to change the base name of the file - the extension .img should be left intact) and click the Save button. The image will be mounted, the original disk image file will be deleted, and a new disk image file created. Unfortunately creating the new image file takes quite a while since it is creating a new one, not actually modifying the old one - but it does get rid of the intrusion of the checksum verification requirement.
    I verified on my G4/500 running OS 9.1 that a .img file (one I had made from a game CD years ago) dropped into the Startup Items folder will be mounted automatically at the end of the startup sequence. I also tested with an alias to the .img file, and it, too, worked fine - the disk image was mounted automatically at the conclusion of the startup sequence.
    When you make the alias to the disk image file (the .img one), be sure you are placing it into the Startup Items folder, and not the Startup Items (disabled) folder.
    If you have the machine set to use Simple Finder (which removes Finder's keyboard commands and many menu options for Finder), that may interfere with items in the Startup Items folder being run at startup. Or, it may not - I have not checked that.
    *** Edit ***
    I have verified that the alias to a .img file will mount the disk image even when the machine is booted using Simple Finder.
    Another thought, related to Multiple Users - if you do decide to set up Multiple Users, and the disk images are of type .img, be sure to authorize Disk Copy for each of the accounts for which the disk images are to be mounted. If you have the disk image files in a .smi format, since Finder views that file type as being an application, you would need to authorize each of those disk image files for each account which is to have access to them.

  • Disk Image/CD-R Confusion

    I'm trying to figure out how to do one simple thing, or at least I hope it's more simple than what I know so far. I want to burn a copy of my Quicken data file to the same CD-R two or three times a month as backup. I've created a disk image of the folder where I put a copy of the latest file for backup. Do I have to create a disk image of that folder every time I want to add the latest file, or can I use the exising image? If I have to create a new image each time, then I end up with a bunch of images on the CD, and they all show up in the Finder when I insert the CD. Is there a way to add the files to the CD using the same image?
    Thanks,
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    Just to clarify. While you will be able to add recent files to the Disk Image if you save it as a CD/DVD Master, you will not be able to keep burning again and again to the CD-R unless you make it appendable. Even with this, after the CD-R is filled you can't erase it and reuse.
    An easier solution is to buy a CD-RW, which can be erased and reused. You wouldn't even have to worry about Disk Images -unless you're using them for security protection. You could just burn the files to the CD-RW and then erase before burning new files to it.
    However, the easiest by far, is to buy a USB Drive. You can find these at BestBuy, Comp USA, etc. They are extremely easy for backups like you are talking about. I'm not familiar with Quicken, so I don't know how big the files are, but you can get a 1GB USB Drives. It great for other things too. An almost necesity for todays living...especially as a high school student like myself.

  • Disk image formats dilemma

    Hi,
    I will be copying about a terabyte of sensitive data to a portable HD with which I will travel. I want to create a blank encrypted, password-protected image on the HD, then start copying files from my Mac at nite and go to sleep - I am sure it will take time.
    Thing is, even after carefully plowing through the help file info about disk images, I am still not sure about some things. Read / write or sparse bundle? What is "sparse"? "Single partition" or "hard disk"? This is not critical, but I would like this to be possibly readable by a WIndows machine; I noticed this in a help file: "If you want to create an archive that users with Windows and other types of computers can open, select the items to archive in the Finder and choose File > Create Archive." I find no command in the menu like this...
    Anyway, any recommendations on setting this up right would be appreciated. I don't want to mess this up! Thanks a bunch!
    Rad

    Hello Rad,
    I see it's been nearly 2 months since your post but just happened to be in my first-ever attempt to do something very similar to what you want.
    In my case: I'm backing up 375 GB of data to an external (1TB) disk using an encrypted sparse image created on that ext. drive.
    For this I'm using the latest version of CarbonCopyCloner - $10 donationware. The only "problem" was getting CCC to "see" the - networked - external drive. To do that, I hunted the CCC menus until I found the item: "Create Sparse Image" - selecting that "revealed" the networked drive image and I just selected the folders I wanted to back up and clicked "Run."
    Word of caution: 375 GB of data requires a lot of time: 17-1/2 hours. User results may vary but I first tested this scheme with a couple of small trial runs: the times (projected for large size files) worked out about right.
    I doubt that "my" sparse image is readable by Windows machines. You don't specify which menu you searched so I have to ask: Was it Disk Utility's menu? If so (and that would make sense) there should be a way to "format" the sparse image to be "Mac / Windows" readable. That's because sparse images may share some characteristics with disk images. I'm not 100% sure, though.

  • Question about creating a bootable disk image in Leopard.

    I have a Powerbook G4 that originally came with OS9, I upgraded to Tiger and recently upgraded to Leopard. The computer is running great but if it should go down what are my bootable options?
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    Of course you can use other software for cloning and backup:
    Backup Software Recommendations
    My personal recommendations are (order is not significant):
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    2. Synchronize! Pro X (Commercial)
    3. Synk (Backup, Standard, or Pro)
    4. Deja Vu (Shareware)
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  • HT201376 How do I go about unlocking a recovery HD? Also I need to know what disk image should I use when trying to restore a failed(erased) disk in DU?

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    You need to plug it into your computer running iTunes and restore it. Have you tried that? If so, what happened?

  • HT1338 MacBook Pro OSX  I keep getting a message, "The back disk image, "/Volumes/Data/Don's MacBook Pro. sparse baundle is already in use so, apparently my Time Machine can't back up my compute for about 2-3 weeks now.  What do I do?

    Time Machine cannot backup my MacBook Pro because:  THe back disk image "/volumes/data/don'sMaBook oro.sparsebundle is aready in use/
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    Please look over to the right of this page and locate the heading of More Like This.
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  • HT3275 what do I do about this time machine error message?  The backup disk image "/Volumes/Data/Paul Brandow's Computer.sparsebundle" is already in use.

    How to resolve the following time capsule error message: 
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    Click OK Let the Time Capsule Re-Boot
    Go Back into AirPort Utility and re-select "Enable File Sharing" and let it Re-Boot again.
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  • I'm getting the following message and need to know what to do about it: "The backup disk image "/Volumes/Joyce's Time Capsule/Macintosh.sparsebundle" is already in use."

    What do I do to get backups to resume, when getting this message: "The backup disk image “/Volumes/Joyce's Time Capsule/Macintosh.sparsebundle” is already in use." ?

    Make sure that no other Macs are backing up at the time
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  • Disk Utility doesn't finish creating new disk image - naming issue??

    Recently I upgraded to Snow Leopard and carried along an empty disk image created in OS 10.4.11. I use these for archiving data on read-only DVDs and password protect the images.
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    Hi Michael,
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  • Cannot delete disk image from timecapsule.

    I have two disk image's on my time capsule and one is for a computer I no longer have.  Therefore I wanted to delete the time-machine disk image.  I recently upgraded to Yosemite.
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    Repeating the above with time machine turned off.
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    Get Info on the drive says that I have no permissions and they are custom.
    Tried some CHMOD commands I found on the internet and i got a series of error messages about CHMOD not possible.
    If I double-click the disk image, I get a file not mountable error.
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    Yosemite is problematic to say the least.
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    There is a post at the bottom with a new method using a program I have not used but worked well.
    I have a post there near the top with the standard methods.
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  • Running Win7 and ITunes 10.6 - loaded all my old CD's in one user acct. I want to share these with all other users on the machine without reloading the CD's and without having to make copies of their disk images, if possible. Also, want them on my WinXP

    Running ITunes 10.6, on a Win7 Home Premium SP1. Just loaded about thirty of my favorite CD's on my user account.
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  • 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.
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    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.
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    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.
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    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.
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    I tried just opening the disk image in Finder by just clicking on the disk image but it won't mount.
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    I don't know why the disk image is that size when the failing Samsung drive only had 450 GB of data on it.
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    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.

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