Disk Image Verify Option

Do I need to select Verify Disk when burning a DVD from my disk image file in the Disk Utility?
Mike

Hi Mike:
You can choose it if you want ot just test the DVD before burning. Otherwise, no.
Here are the general instructions:
http://docs.info.apple.com/article.html?artnum=42724
Sue

Similar Messages

S.m.a.r.t. status failing, HD won't mount, verify, or repair. Can't make disk image. Any other options?

My iMac won't boot up. It gets to the grey screen with the progress bar. Gets about a third through the progress bar, then shuts off.
I boot up with the recovery disk. The S.M.A.R.T. status is "failing." Disk Utility shows the following message:
"The disk has a hardware problem that can't be repaired. Back up as much data as possible and replace the disk. See and Authorized Apple dealer for more information."
I have tried:
• In disk utility the HD can't be verified or repaired
• Making a disk image from disk utility. I got a message "input/output error"
• Using my MacBookPro laptop to boot up the iMac in target disk mode. The iMac wouldn't mount.
I backed up up a few months ago, so I'm not totally out of luck. But there's a few recent projects I'd like to salvage.
This is a 21.5" iMac with 3.33 ghz, 2x2 gb, 1000gb running the latest Yosemite OS
Any further things I should try before carting the iMac to Tekserve? Thanks everybody.

I'm afraid from your description it sounds as if the disk is seriously damaged in some way. I don't think there is anything more you can do, short of taking it to a specialist recovery service which would be extremely expensive.
Your service engineer will take the disk out and replace it with a new one; ask to keep the original disk. You could try putting it in an enclosure (more expense) and seeing whether anything will access it, but I have to say that given what you've already done it's extremely unlikely you will have any sucess.

Disk image for restore won't verify

Hi - I'm preparing to send my G4 Pbook (10.4.11) for repair.
It was recommended that I make a disk image of the HD "just in case".
So I booted from the original install disc (10.3), launched Disk Util and made a new image on an external drive. Read only, not compressed. About 3 hours later I had a DI and decided to "verify" it. It would not. So I rebooted from the normal system and tried to mount the new DI. It would not and gave a message "the DMG is faulty and it may damage your hard drive if you mount it". So I trashed it, emptied the trash and used DU to erase that external drive in ready for the next try.
DU Help files are short and pretty clear. What did I do wrong? Can someone please give me a procedure I can succeed with?
TIA
d2

Don't make a disc image. You cannot boot from one and they can be finicky. They are not what you want. Instead you want to clone your hard drive to an external Firewire hard drive. It's done as follows:
How to Clone Using Restore Option of Disk Utility
1. Open Disk Utility from the Utilities folder.
2. Select the destination volume from the left side list.
3. Click on the Erase tab in the DU main window. Set the format type to Mac OS Extended (journaled, if available) and click on the Erase button. This step can be skipped if the destination has already been freshly erased.
4. Click on the Restore tab in the DU main window.
5. Select the destination volume from the left side list and drag it to the Destination entry field.
6. Select the source volume from the left side list and drag it to the Source entry field.
7. Double-check you got it right, then click on the Restore button.
Destination means the drive to which you will restore or backup.
Source means the drive you are restoring from or backing up.

Firefox has said verifying the disk image for over 30 minutes while i am trying to download

I am downloading Firefox 3.6.3 dmg onto my Mac and it has said verifying the disk image for the last 30 minutes and won't let me access it
== upon downloading ==
== User Agent ==
Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10_6_2; en-us) AppleWebKit/531.21.8 (KHTML, like Gecko) Version/4.0.4 Safari/531.21.10

See:
*Firefox/Tools > Options > Advanced > General : Accessibility : [ ] "Warn me when web sites try to redirect or reload the page"
The setting in "Tools > Options > Advanced > General" is meant as an accessibility feature, as you can see by the label of that section, so that people with disabilities or people who use screen readers do not get confused and is not meant as a safety protection to stop redirecting.
See also:
*https://support.mozilla.com/kb/Options+window+-+Advanced+panel#General_tab
*http://kb.mozillazine.org/accessibility.blockautorefresh
*http://kb.mozillazine.org/Accessibility_features_of_Firefox

"Always Open In..." View Options for Root Level of a Disk Image File

I ran into a problem/bug tonight that I can't find listed anywhere and was wondering if anyone else has encountered it. I am using Snow Leopard (now 10.6.1), upgraded from the last revision of Leopard.
I create DVD-R sized disk images with Disk Utility (using "Mac OS Extended" only w/o Journaling) for saving downloaded files. Because of the number of files on this disk, I create single-letter folders (for alphabetical filing) and set up these disk images to "Always Open In List View". For the individual folders, I can set these to "Always Open In List View" without a problem. However, for the "root level" of these disk images, I can only access "Always Open In Icon View" no matter which view option is selected.
For previously created disk images that were already set to "Always Open In List View", these show the previously set "List View" at the disk image "root level" as expected. But if I uncheck the box, it immediately goes to "Always Open In Icon View". And like before, no matter which view option is selected, I can never get back to "Always Open In List View". Note also that I can set this option as expected for "root levels" of real disks - this only seems to be a problem with the disk image files.
I had no problems at all with this under Tiger or Leopard. I've only run into this now under Snow Leopard. The upgrade tonight to 10.6.1 hasn't seem to affect this problem.
So should I be doing something differently now to get this option to reappear, a possible conflict with something on my computer or is this a bug with Snow Leopard? Can anyone else duplicate this issue?

Additional info, in case anyone is running into this issue...
If I do the following with the "root level" of the disk image, I can set the "Always Open in List View" option.
1. Open the "root level" view of the disk image - for me, it always opens in icon view. Then, select "Show View Options" from the View menu.
2. Check the "Always Open in Icon View" box. While leaving this dialog open, select "as List" from the View menu.
3. Uncheck the "Always Open in Icon View" box. It will instantly turn into "Always Open In List View". Recheck this box immediately, then close dialog. This will make the setting stick.
I've been able to repeat this situation several times. I might be wrong, but it sure acts like a small bug to me. Hope this helps anyone else who might have encountered this issue.

Questions related to Disk Images - Image Format Options

Can anyone tell me a more about using Disc Images? I am with a group of new Mac Users and we're focusing on Disc Images at the moment. Want to create a Keynote Presentation for the group when finished.
I have found already a few answers here, if someone could help me on the rest?
In this Thread I focus on the Image Format.
Disc Utility (using OS 10.5.7) offers the following options when creating a Disc Image:
sparse Disk Image
sparse bundle Disk Image
Unanswered Question:
1) What is the difference between sparse Disk Image and sparse bundle Disk Image?
Answered Question (if you have ad-on Informations for the answered Questions feel free to jump in):
Question: What is sparse disk Image for?
Answer: "Choose an image format. You can use "sparse disk image" for a disk image that only uses as much space as it needs, rather than a set amount of space. If you're not sure, use "read/write disk image" choice." (Source: How to create a password-protected (encrypted) disk image in Mac OS X 10.3 or later: http://support.apple.com/kb/HT1578)
Thanks in advance
Rama

Thank you both for your Infos so far. In the meantime I've created some Disk Images. What I noticed is, when I choose a small Image Size like 10 MB, then it changes from "Single Partition Map" to "No Partition Map". When I go bigger to 500 MB it changes to "Hard Disk".
It was already helpful to read the Manual to understand the Single Partition Maps, but what I still don't understand is the difference between using "no partitions map" at all and the other options such as "Hard Disk", "CD/DVD" or "CD/DVD with ISO Data".

Explain Image Format options in disk utility

I have a DVD full of jpeg files. I want to make an exact replica. I've read the explanation of how to do this in the Disk Utility help section. There are four options under the Image Format dropdown menu. Presumably there are advantages and disadvantages to each of those options. Where do I find an explanation of those choices? What is my best choice for making an exact replica that can be read by any other DVD drive?

Finally stumbled across the explanation buried in DU Help:
IMAGE FORMAT DESCRIPTION
read/write
Choose this if you want to continue adding files to the disk image after it’s created.
sparse bundle disk image
Choose this if you want to continue adding files to the image and want to conserve space. The disk image is just large enough to hold the files in it and expands to its maximum size as you add files to it. For example, if you create a 100MB sparse bundle disk image, its maximum size is 100MB.
read-only
Choose this If you don’t need to add more files to the disk image.
compressed
Choose this if you don’t need to add more files to the image and you want to conserve space. The data is compressed so the disk image is smaller than the original data.
CD/DVD master
Choose this if you want to use the disk image with a third-party application. The disk image contains a copy of all sectors of the disk, whether they’re used or not, and copies them to other CDs or DVDs bit for bit.

Options for image format and encryption when creating disk image?

I am trying to help someone via email, so I am not positive that he is doing everything I tell him .
He was having problems with creating a disk image of his project, but I thought he was getting it now until he sent me a message asking what settings I select when creating a disk image. He included a picture that has the options in drop-down bars. The first two are not a problem, but I don't know where the second two are coming from, as I have never gotten those:
+Save As: [Name of project]+
+Where: [Location]+
These two are what I see each time I do a 'Save as disk image' but he also has a block with these other two options, that I have never seen. I put his default selections in the brackets:
+Image Format [read-only]+
+Encryption: [none]+
I took a look at iDVD's options for archiving a project, thinking that he had done that, but I still do not get these options.
Any information appreciated.

Beverly Maneatis wrote:
... How do I get a screenshot into these replies?
send me an email, Bev, I'm shy to publish here that simple html code.. (picture has to be on some webspace...) .. I want to avoid, some 'beginner' posting here 10Mpixel vacation pics....

Disk image option

I wanted to create disk images of FCS 3 so that when I install SL, it will be faster and easier to install FCS. Which option in disk utility do I use when creating the images? read-only or CD/DVD master? I tried CD/DVD master and it created a .cdr file is that right?

You want the CD/DVD Master setting.

Disk images PPC -- x86 won't verify

Not sure where my problem is, so here's all the info (this happens always):
I've discovered that when you download a disk image (dmg) made with a PPC from a PPC using sftp to an Intel Mac, that the disk will fail verification ALWAYS. Sometimes I think the disk will mount, but sometimes it refuses to, and it doesn't matter whether the image is read-only and uncompressed.
15" MacBook Pro 2Ghz • 12" PowerBook 1Ghz Mac OS X (10.4.6)

This is a strange problem. I am going to have to try to reproduce it on my system.
In the meanwhile, try opening Disk Utility. Try using the Convert... function, which is usually used to change a disk image from one format, say read only, to something else, such as encrypted. Try converting it to another type, specifying a new disk image name.

Hard Drive and Disk Image not mounting

Hey everyone,
I'm running a G5 Dual 2Ghz. with OSX 10.5.8 I'm having problems with a back up hard drive. It is an external Western Digital My Book 1.5TB SATA drive. After using it for a few months, it suddenly did not mount anymore.
*1) It also would not appear in Disk Utility.*
a) Disk Warrior couldn't find the drive (I think because it's formatted with FAT32)
*2) I then took the drive out of the enclosure and put it in the spare bay in the G5.*
a) It didn't mount
b) It did show up in Disk Utility
c) In Disk Utility it wouldn't give me the option to Repair Disk Permissions or Repair Disk
d) In Disk Utility is says under Partition Scheme: Unformatted
e) In Disk Utility I don't have the option to mount/eject only gives me the "info" option
f) Tech Tool did find the drive and it passed all tests
g) Disk Warrior still did not find the drive
h) TestDisk finds the drive, but does not find any partitions
*3) I then created a disk image of the drive in Disk Utility onto an external hard drive. The image comes back at 320GB, which seems to be about right I think.*
a) The disk image would not mount with Disk Image Mounter. It would say there is an Unrecognized File System
b) In Disk Utility - I don't have the option to Repair Disk Permissions
c) In Disk Utility - When trying to Repair Disk - I get the error: Repairing Disk failed with error Unrecognized FileSystem
d) In Disk Utility - If I click Open - The Log file says:
+Attach Image+
Initializing...
Verifying...
Finishing...
+Image of "disk0.dmg" attached successfully+
+Mount of "disk0.dmg" succeeded+
-But it is no where to be found
e) Disk Warrior can not find the Disk Image
f) I took the new external drive with the Disk Image to 3 other mac computers but the image would not mount
*4. Other things I've tried when opening the Disk Image for the new external drive.*
a) in Terminal - hdiutil attach -nomount "volumes/untitled/disk0.dmg"
b) in Terminal - sudo hdiutil attach -nomount "volumes/untitled/disk0.dmg"
c) Deleting files System/Library/Extensions.kextcache
System/Library/Caches/com.apple.kernalcaches
ALL UNSUCCESSFUL
I'm running very low on ideas. I know I could just erase the drive and reformat it, but the files on it are very important and must be recovered.
Any help or suggestions would be very helpful. I will not have time until after the weekend to try more things. Thanks in advance if you do not hear back from me until after this weekend.

Yes, it will. But if DU says the disk is unformatted then it is also not accessible. If you have files you don't wish to lose then you will need to try recovery software:
Basics of File Recovery
General File Recovery
If you stop using the drive it's possible to recover deleted files that have not been overwritten by using recovery software such as Data Rescue II, File Salvage or TechTool Pro. Each of the preceding come on bootable CDs to enable usage without risk of writing more data to the hard drive.
The longer the hard drive remains in use and data are written to it, the greater the risk your deleted files will be overwritten.
Also visit The XLab FAQs and read the FAQ on Data Recovery.

Anyone know Disk Utility, Ignore Ownership, and disk image DL DVD issues?

I am currently having issues with backup DVD's I burned using Disk Utility. I can put the dual layer DVD's in and the system reads them. When I try to pull a file off the Dual Layer DVD a circle with an X appears notifying me that I cannot copy the files to my desk top.
When I check the DVD's permissions it reads Admin (me) read and write with the ignore ownership checkbox checked...which means I should be able to pull files off the DVD. The only way I can currently get information off the DVD is to duplicate the entire disk to a new folder by selecting the DVD while holding down the Cntrl key and selecting duplicate. I have had other issues with DVD's and disk images in Leopard....including having to eject either through disk utility or by selecting the image with the Cntrl key held down. Finder eject, keyboard eject, and the menu eject selections suddenly report that the disk is in use.
The DVD's were burned by creating a dual layer dvd image through disk utility with the read/write option checked.
After duplicating 2-3 disks, the system itself is unable to mount any more disks from the series of backups. When I look at disk utility it reads that the disk is not mountable. I have to restart my computer so the system can continue to read the backups.
My Itunes disk backups are marked the same way (ignore ownership) with admin read/write privlages....I have no problem pulling files off these disks.
I have tried both logging in as root and booting from an external drive...same problem. Is this some nasty Disk Utility bug? Is anyone else having bizarre permission related issues with Disk Utility and Disk Images.

When you create the image in Disk Utility, did you
change the 'Partitions' setting?
If you leave it to read 'CD/DVD', it will create a ISO9660/UDF image.
To be able to maintain permission and extended file attributes, you
need to select 'GUID Partition Map'.
I assume you used iTunes to create your music backup?
It seems it creates the correct image type for you.
Before sending this message, I actually created a single layer image,
copied some files to it and gave additional permissions to other users on my system.
Afterwards I copied the files to my Desktop, verifying that the attributes are still intact.
Best regards
(It took quite a while to burn this 4x DVD-RW Anyways, I hope I could help)

How do I backup my MacBook Pro when the disk image is grayed out?

I have a MacBook Pro (15 inc. four years old) running OSX 10.6.8 and last night I got the color pinwheel of death. I could not force quit anything and had to manually power down.
When I powered back up I got the folder with the question mark. I ran Disk Utility and tried to Repair Disk, but I got:
Disk Utility stopped repairing "diskOs2"
...Back up as many of your files as possible
Details: Invalid B-tree node size
The volume could not be verified completely
Volume repair complete
Error: Disk Utility can't repair this disk, Back up... at the disk, and restore your backed-up files
I hooked up an external hard drive and tried to make a copy of the disk image, but it is grayed out. I also tried to partition the main Hitachi drive and make a "New Image" but I got: "Unable to create backup (input/output error)
So I now have a Genius Bar appointment for tomorrow, but I can't even back up my computer before going. I can have them tell me what to do, but then I'll have to go home and do it, and then make a second appointment.
Any suggestions? Oh, and I backed up this computer about six weeks ago on Time Machine, but I'd love to make a copy of all new files I've created since then.
Thanks!

You have two options. Purchase Disk Warrior or erase the drive. The former would require your ability to install a download of DW on a bootable disk so you could repair your hard drive. And, DW costs $99.00. The latter requires a Snow Leopard installer DVD from which you can boot, erase the hard drive, then reinstall Snow Leopard. Then download and install Mac OS X 10.6.8 Update Combo v1.1. You can then restore from your Time Machine backup. There is no way now for you to backup files unless you can access the drive. Open Disk Utility, select the entry for your disk volume then click on the Mount icon in the toolbar. If your volume mounts on the Desktop then you may be able to copy files to an external drive or even run a Time Machine backup.

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.
Thank you,
EZ

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.

Backup disk and Disk Images not mounting

*Intial Disk Utility problem:* Recently my trusty 6 year old PowerBook G4 died from hard-drive failure, with most of my data backed up on external drives. Before migrating data over to my new iMac, I performed "First Aid" in "Disk Utility" on the external backup drive. One of the drives (500GB iomega drive) that backed up my PowerBook and my PC had 5 partitions (4 were FAT32, and 1 was NTFS), somehow got erased in Disk Utility. Even though I was just verifying one of the partitions the whole drive was cleared and renamed: disk2s4 (28kb) and disk2s10 (372.5GB). This didn't take much time, so I knew all the data hadn't been cleared, and checked the Security Options for Erase, and its set to "Don't Erase Data."
*Disk Warrior attempt:* At this point, having a sorta wrecked backup drive that still apparently had data, I bought Disk Warrior and gave that a try. It read the drive the first time, but couldn't recover any of the directory information. Hoping to not overwrite anything, at that point, I didn't proceed with the "rebuild" option. Now when I try Disk Warrior, it just says:
Directory Cannot be rebuilt due to disk hardware failure (-50,447)
- This disk appears to be a MacOS standard sik
- This disk does not appear on the desktop
- This disk is 372.49 GB in size
- Disk ID: disk2s10
- File system: HFS (standard) +even though most of the drives had been fat32+
Now Disk Warrior doesn't even give the option to scan the drive.
*Disk Imaging attempt:* Disk Warrior is claiming a hardware problem (which isn't really the case), so I tried making a disk image in Disk Utility of both disk2s10 and disk2s4. I tried opening disk2s10.dmg in Finder and in Disk Utility, and get the message: "No mountable file systems." In the past when confronted with unmountable disk images, I've used VLC media player. So, I pull up VLC read disk2s10.dmg and music starts playing!!! At first I freak out, then I realize that its the first song listed in my iTunes library -- the data is there, can be retrieved, but I'm not sure how to get it!
*Next attempts:* the only other thing I can think of is to try daemon tools or something on my PC, or bring the drives into the the school IT guys.
Please let me know what you think would work that I haven't already tried. Though I have redundancy in the backups, I haven't been able to recover some data for my PhD thesis due in a month, and therefore haven't given up on reviving this disk yet.

I've downloaded the DataRescue and FileSalvage trials, and am currently scanning with DataRescue which will take another few hours. Thanks for those recommendations, its so useful to have a trial scan before buying.
*General Question:* I noticed through these various attempts that reformatting extra drives in the current version of Disk Utility has become a little more dangerous than before. For example, I was reformatting a spare disk from FAT32 to HFS+ and the drive became unmountable. This never happened to me in earlier versions of OSX, and now it seems to happen every time, and partly why my partitions got all screwy. Any thoughts?

Disk Image Verify Option

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