.dmg .cdr (Disk Utility)

This is a cross posting. Didn't get any replies in the video apps forum.
I've searched the archives and one article on another site. When copying a CD, there is supposed to be a difference between CDR (exact copy) and DMG (single file) images. But I've copied three DVDs and in my newbie ignorance I got one CDR image and two DMG. These look identical in Finder (two folders audio_ts and video_ts). They have both successfully been burned to DVDs.
So, inquiring minds want to know: Is the difference between the two formats no longer relevant in Tiger? or with DVDs as opposed to CDs? or am I going to run into a problem with DVDs made from DMG eventually as I try them on more machines?
Many thanks,
Jeanne

Hi Jeanne,
a .dmg file contains an image of exactly one partition. This is almost
always what you want when you take an image of one disk: you don't care
about anything except the data in the partition.
A .cdr file contains an image of a whole disk (leaving aside the
differences between a CD, DVD, and hard disk). This includes some data
which is outside the data partition and doesn't matter if you're not
going to use the image to master a new CD/DVD.
So in my opinion for your task there is no difference between using dmg or cdr.
Regards
Stefan

Similar Messages

Error message when trying to create DMG with Disk Utility

Have a highly confidential folder on my drive, so am driving to convert to a DMG file, with password protection. It gets nearly done with the DMG process then generates Error - 49168.
Anyone know what means?
1.I choose read-write as my access options
2.Under encryption I choose the AES setting. It asks me to create a password and I create one (unchecking the "remember password option, of course")
3. It seems to get through 95% of the process, then produces that error message.
-- david in KC

A little Googling suggests that Norton Anti-Virus can cause this problem by trying to scan the image as it's being created. The fix seems to be to turn off NAV while creating the image.
If that doesn't work, I'd suggest rebooting from the system disk and having Disk Utility repair the disk, to make sure all is in good working order.

Can't find .dmg file Disk Utility shows is there

I've been trying to clean up/gain space on my G4-12" PowerBook. In Disk Utility it shows a .dmg file that when mounted is an audio CD I received from a friend a couple of years ago. I imported the songs from it at the time, ejected, and that was that. Now I see in Disk Utility that this dmg holds ±500mb of space, but I can't find it to delete it. This is quite strange and never happened before. Find, Spotlight, EasyFind (including looking for invisibles), etc. cannot locate it. In Disk utility it shows the path as /Volumes/<name>, implying it is mounted. Upon clicking 'Open' it mounts the <AudioCD> which then shows up in the left side of my Finder windows. I can open this volume, click on a song and it plays, so it is clear that it does exist and not just an artifact. I can eject the AudioCD and it disappears. But I can't get to the .dmg file to make it go away.
Any ideas on this are greatly appreciated as I've run out of paths to try....but I've not dipped into Terminal so would greatly prefer an alternative if it exists. Thanks in advance!

Have you done a Find/Search using just dmg, rather than a search for the file name?
To increase your HD's free space, look at these links.
Where did my disk space go?
http://www.macfixitforums.com/showflat.php?Cat=&Board=Forum38&Number=770243
Download & use WhatSize described in this link or Disk Inventory X @ http://www.derlien.com/
Freeing space on your Mac OS X startup disk
http://www.thexlab.com/faqs/freeingspace.html
Amazing Disappearing Drive Space
http://www.pinkmutant.com/articles/TigerMisc.html
Increase HD Free Space
http://macosx.com/forums/howto-faqs/275191-how-easily-increase-hd-free-space-lap top.html
How to free up my disk space
http://www.macmaps.com/diskfull.html
 Cheers, Tom

How to erase a dmg in Disk Utility

A few months back, I was trying to make a copy of an audio CD. I thought I could do this in Disk Utility so I "loaded" the CD in it. When I couldn't make a burnable copy, I just used iTunes to get the job done.
Now, when I go into Disk Utility, I see the dmg file that was created when I attempted my copy. I cannot get Disk Utility to allow me to erase it (and gain back about 0.5 GB of space)! I can click the dmg and mount the image in Disk Utility, but all the Erase options are grayed out. It also tells me that it's a read-only image.
Also, this dmg is only visible in Disk Utility. I cannot see it in the regular Finder. I even tried deleting the files (once I mounted it) but OS X is telling me that I don't have sufficient permissions. Get Info tells me I'm the owner the dmg and the files so I'm confused ...
Anyone have an easy method to get rid of this disk image?
Thanks!
Joe.

It appears that the disc image is actually MOUNTED. You may need to su to root, "umount" it then delete the file from the su session.
Try this:
1) If the root account is not currently enabled, launch the NetInfo Manager (from Applications > Utilities) then select Security > Enable Root User and set a root password.
2) Open a Terminal window
3) Type "su -" and enter the root password
4) Type "mount" and observe the list of mounted volumes. Look for one which references your cd image, like "/Volumes/Audio CD.dmg on /Volumes/MyMountpoint" (where MyMountpoint likely says something else)
5) Type "umount /Volumes/MyMountpoint" It should return nothing, just a new command prompt
6) Type "rm /Volumes/Audio CD.dmg" (you might need to enclose the path in quotes, because it contains a space, like rm "/Volumes/Audio CD.dmg", but my examples are all in quotes, and I'm not well-versed on quoting quotes.)
7) Type "exit" from the su session, then "exit" from Terminal.
That should permanently remove your file.
If you get any strange results, or would like to share the output of the "mount" statement, please send them.
Regards,
BW

Greetings world.I have created a dmg. of my entire iomega ext HDD via disk utility using a mac book pro. It is currently sitting on the desktop. I have erased the iomega and now I can not understand how to put the dmg back.

It is safe to say that i need help..................
let me start at the beginning.
I have 1 2008 imac. always a pleasure never been a problem. Attached to it i have an iomega 500gb ext drive. also been ok.
until now!!
The HDD would not mount. Disk utility suggested that it was ok so i tested the imac HD. I got error code 4MOT/2/40000004: HDD- 1502. This doesnt worry me at the moment.
I attached iomega to my Mac book pro and again it would not mount. The disk utility did tell me that the iomega needed repair. it advised that i should wipe it and restore.
So I used the MB Pro disk utility to create a DMG. and saved it to the desk top. I then erased the iomega. did a repair and it all seemed ok. So then i try to do a restore.
After a very long time it said internal error with the dmg. using disk utility i did a convert dmg (compressed) and saved it to the iomega. middle of the night job!!
got up this morning and indeed it had sent the DMG to the iomega. But i could not open it. The iomega itself seemed dandy asking me if i wanted to use it as a time machine etc and it mounted ok and i saved a small jpeg to the iomega as well. I then thought that maybe when i did the convert as a compressed file i made a mistake. i'm guessing it should be a read and write so i started all over again.......... wiped iomega (which was quite quick) then tried the convert tool again.....it trys for a while then says there is not enough disk space...........I'm not sure which disk it is refering to.??
I have purchased a 1tb hard drive today incase the iomega is some how full up.
So really my question to the world is .........Help?

well no reply from the community. sniff- do i stink!? - probably a little bit. If i have lost all that data then I'm gonna really really pong.
Any ways i have purchased a 1tb usb HDD and have managed to duplicate the dmg file onto it. however still unable to mount the **** thing. so now i have ordered disk warrior which will be in my possession tomorrow.
fingers toes eyes crossed.

Backup startup external drives, disk utility, dmgs

Dear All,
I am trying to backup my Mac Mini to a Firewire drive with an image file (dmg) using Disk Utility. But I get this error: "Unable to create dmg. Resource busy." That is due to my startup disk being my Mini which I'd like to backup. So I've tried to make a backup drive with a working system 10.4.10 folder, but found that my Mini did not come with install disks. Dragging and dropping the files from the Mini to an external disk does not result in a hard disk that can be used as a startup disk. Is this normal? When I opened the Mac Mini package it did not indicate that I was due to find install disks.
So how can I make an external backup FWire drive that I can start from, and then do a backup using Disk Utility of my Mini's internal hard drive?
Thanks for any advice.

Extended Hard Drive Preparation
1. Boot from your OS X Installer Disk. After the installer loads select your language and click on the Continue button. When the menu bar appears select Disk Utility from the Installer menu (Utilities menu for Tiger.)
2. After DU loads select your hard drive (this is the entry with the mfgr.'s ID and size) from the left side list. Note the SMART status of the drive in DU's status area. If it does not say "Verified" then the drive is failing or has failed and will need replacing. Otherwise, click on the Partition tab in the DU main window.
3. Set the number of partitions from the dropdown menu (use 1 partition unless you wish to make more.) Set the format type to Mac OS Extended (Journaled, if supported.) Click on the Partition button and wait until the volume(s) mount on the Desktop.
4. Select the volume you just created (this is the sub-entry under the drive entry) from the left side list. Click on the Erase tab in the DU main window.
5. Set the format type to Mac OS Extended (Journaled, if supported.) Click on the Options button, check the button for Zero Data and click on OK to return to the Erase window.
6. Click on the Erase button. The format process will take 30 minutes to an hour or more depending upon the drive size.
How to Clone Using Restore Option of Disk Utility
1. Open Disk Utility from the Utilities folder.
2. Select the backup or 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 backup or destination volume from the left side list and drag it to the Destination entry field.
6. Select the startup or 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.
8. Select the destination drive on the Desktop and press COMMAND-I to open the Get Info window. At the bottom in the Ownership and Permissions section be sure the box labeled "Ignore Permissions on this Volume" is unchecked. Verify the settings for Ownership and Permissions as follows: Owner=system with read/write; Group=admin with read/write; Other with read-only. If they are not correct then reset them.

Cant restore my macbook with Disk utility and my .dmg image

My macbook would not boot anymore. Stuck on gray screen with apple logo, spinning wheel and a loading bar for a while after shutting off.
I was able to get to Disk Utility in the recovery mode and, after a while, was able to make an image of my filesin an attempt to back them up.
The .dmg was put on an external and i checked it on my imac, i could open the .dmg file and browse all my files from my macbook, so those are safe!
After that i tried to wipe the SSD of my macbook and put the image back but that didn't work, also some resource is busy errors.
After trying this a few times without succes i figured i'd try to do a clean install. This worked.
My macbook air is working again but if Iuse Disk Utility in the recovery now and try and restore my image (.dmg file) it gives me Restore Failure; An error (-16) occured (resource busy) as well. I also tried to copy the dmg onto my macbook and run disc utility when booted into OSX. I open up the back up .dmg with Disk utility, then i go to my macbooks partition (Macontiosh HD) and use that as a destination and drag the mounted image as the source as shown on the image below. Am I doing something wrong here?
Doing this i get an error as well: (-119,930,878) Resource busy as you can see.
What can i do to get my image back on my macbook? Any 3rd party software?
I considered just transferring the files after opening the .dmg file but this works only for documents and not for programs and settings of the default apps.
I've looked all over the Internet and it seems more people have had this error but then with making the image, they also suggest unmounting the destination disk before trying to restore but my destination is Macintosh HD, i cant really unmount that can i?
Thanks in advance!

To make a clone, in the future you need to use a program like superduper or carbon copy cloner.
Either program makes an identical clone while preserving certain system files and marking/indicating to OS X that the clone is bootable.
Using Disk Utility to make a DMG was a good idea, but this will not yield a bootable image.
If Disk Utility could do a 1:1 copy of everything, then people would be using it to rip/duplicate DVDs.
But Disk Utility does not (it leaves out certain invisible/system files), hence it cannot duplicate/clone a hard drive or DVD.

.dmg files open disk utility. Can't install new software

For the last few months I've not been able to download and launch disk images (.dmg files). Instead of a dialogue asking if I want to launch the downloaded file or some other natural step in launching the disk image, I hear the hard drive boot as if I'm restarting the computer, and disk utility opens.
Disk utility sees the image and its path clearly, but shows the status as "Not Mounted." When I control click on the .dmg file, disk utility is the only app shown to open it, and in the main applications directory there is no obvious choice to mount the disk image.
This has happened twice when apple service folks ask me to download their app to view my desktop actions, and after some frustration they just give up and talk me through solutions the old fashioned way. One of them mentioned that I might be missing a certain script, but neither was willing when asked to help me solve the problem. Another asked that I try opening it with Safari (?) but like many apps it was greyed-out when I access the applications directory as mentioned above.
I'm running 10.5.8. Thanks for any tried and true solutions as I'm now not able to download and install various software (the latest upgrade of Skype for example) and this is clearly a critical problem.
Thanks,
Joseph

I just solved this myself, having clicked on a related "More Like This" link after I posted...
After double clicking the .dmg file in my download directory and automatically launching Disk Utility, I selected the .dmg disk image in the left-hand column. I then clicked over to the "Restore" tab in the top-center of the Disk Utility panel.
In the upper row of control buttons, I clicked the "Open" icon. This was not an obvious choice because it is small and "Open" is not the function I was seeking. If you roll-over that icon it says it is for mounting or unmounting a disk.
The disk image then mounted on the first try AND once it was mounted the "Open" icon name suddenly changed (greyed-out) to read: "Mount." A bit of an odd and elusive process but much easier than other more invasive procedures (like "repairing permissions") to recreate that auto-mounting capability I had lost...

Problems with Disk Utility backup & restore via DMG disk images

I attempted to backup and restore a 2TB external raid storage device using the recommended Disk Utility procedure for 10.6.6. One of the HDDs in the raid enclosure had started to fail.
First step was to create a new image from the 2TB device. I accepted the defaults of compressed image format and no encryption. The image took about 15 hours to create, and when complete, I was left with 2 files:
OWC2TB.dmg (1.1TB)
OWC2TB.002.dmgpart (486GB).
To check the DMG I ran the Disk Utility "Verify Disk" on the DMG, and got the message "The volume OWC2TB appears to be OK". The DMG is described in DU as:
Description: Apple UDIF read-only compressed (zlib)
Connection Bus: Disk Image
Total Capacity: 2 TB
Disk Write Status: Read Only
Partition Map Scheme: No partition map
I then replaced the failing HDD in the enclosure, recreated a new 2TB filesystem on the device, and attempted to restore from the DMG image.
The first attempt was to use Disk Utility "Restore" function. I specified the DMG as the source and the new device as the destination, and chose "Erase Destination". This failed immediately with the error "Restore failure. Could not find any scan information. The source images needs to be imagescanned before it can be restored".
After researching this error I tried to correct it by selecting the DMG in Disk Utility and running Images => Scan Image for Restore. This failed immediately, complaining there was insufficient disk space. More research revealed it needed the same amount of spare space on the same disk to do an imagescan. So I had to free up an EXTRA 1.5TB of space in addition to the space the DMG consumed. Not very user friendly.
The next attempt to imagescan the DMG got further than the "insufficient space" error. It displayed "Scanning image OWC2TB.dmg, Block Checksum Partition #1". This ran for about 10 hours. At the end, it displayed a new error message "Unable to scan OWC2TB.dmg (internal error)".
Next I tried to mount the DMG and copy the files manually. My first attempt at this resulted in a "Verifying..." phase which looked like it will take about 10 hours, so I clicked "Skip". Soon after I got an error message "Unable to attach OWC2TB.dmg (no mountable file systems).". Now I am trying a mount with the Verify option...
Can anyone suggest what I can try next to restore the DMG?
I think the problem might be the fact the DMG is split in two parts, but the imagescan/restore software does not know how to read the second part? Is there a way to join these into a single DMG?

I attempted to backup and restore a 2TB external raid storage device using the recommended Disk Utility procedure for 10.6.6. One of the HDDs in the raid enclosure had started to fail.
First step was to create a new image from the 2TB device. I accepted the defaults of compressed image format and no encryption. The image took about 15 hours to create, and when complete, I was left with 2 files:
OWC2TB.dmg (1.1TB)
OWC2TB.002.dmgpart (486GB).
To check the DMG I ran the Disk Utility "Verify Disk" on the DMG, and got the message "The volume OWC2TB appears to be OK". The DMG is described in DU as:
Description: Apple UDIF read-only compressed (zlib)
Connection Bus: Disk Image
Total Capacity: 2 TB
Disk Write Status: Read Only
Partition Map Scheme: No partition map
I then replaced the failing HDD in the enclosure, recreated a new 2TB filesystem on the device, and attempted to restore from the DMG image.
The first attempt was to use Disk Utility "Restore" function. I specified the DMG as the source and the new device as the destination, and chose "Erase Destination". This failed immediately with the error "Restore failure. Could not find any scan information. The source images needs to be imagescanned before it can be restored".
After researching this error I tried to correct it by selecting the DMG in Disk Utility and running Images => Scan Image for Restore. This failed immediately, complaining there was insufficient disk space. More research revealed it needed the same amount of spare space on the same disk to do an imagescan. So I had to free up an EXTRA 1.5TB of space in addition to the space the DMG consumed. Not very user friendly.
The next attempt to imagescan the DMG got further than the "insufficient space" error. It displayed "Scanning image OWC2TB.dmg, Block Checksum Partition #1". This ran for about 10 hours. At the end, it displayed a new error message "Unable to scan OWC2TB.dmg (internal error)".
Next I tried to mount the DMG and copy the files manually. My first attempt at this resulted in a "Verifying..." phase which looked like it will take about 10 hours, so I clicked "Skip". Soon after I got an error message "Unable to attach OWC2TB.dmg (no mountable file systems).". Now I am trying a mount with the Verify option...
Can anyone suggest what I can try next to restore the DMG?
I think the problem might be the fact the DMG is split in two parts, but the imagescan/restore software does not know how to read the second part? Is there a way to join these into a single DMG?

Dmg files won't mount, Disk Utility/Toast won't launch?

Hi folks,
I've just joined your fine community in search of help with my problem that I see on Google pops up on boards frequently... but no suggestions have helped me yet...
In a nutshell, if I download any dmg file, eg. Apple updaters, they won't open - the error dialogue is something like "failed to open, no mountable file system". This seems to be an underlying general error, as I also can't launch disk applications like Disk Utility and Toast. They just bounce in the dock and then quit.
I have:
- rerun the 10.4.4 combo installer
- done /sbin/fsck -yf at startup - all reported ok
- booted from and run Disk Warrior - all reported ok
- booted from and run Techtool Pro - all reported ok
- switched to another user account.
And the problem with dmg and Disk Utility/Toast persists! In all other respects, the Powerbook G3 (576mb/80gb) is running fine (apparently).
Hope someone can help
B
Powerbook Mac OS X (10.4.4)

I just went thru a simular problem. A couple of things to try.
Boot of your install disk and ignor the install window and open disk utility from the menu at the top. you are running off the o/s on the disk an not the hard drive. You can repair permissions and the Hard drive because you are now working off a different filesystem.
If that doesn't work do a rinstall from the install disk but when you get to the window that has an "options" button select it (you may have to) and instead of doing a full install. Uncheck all boxes. This way it does not reinstall fonts etc.
You will not lose any files or programs or have to reinstall them. You might have to reinstall devices that have special drivers like printers that came with an install disk etc.
You will revert back to the origional ver like 10.4.1. just go to apple update and let it do its thing.
Good luck

Mounting .dmg updates using Disk Utility?

Hello Apple Forum,
I've got a problem you might be able to solve.
Adobe Illustrator CS is crashing. I have posted the prob here and at the Adobe forum. The Adobe forum has advised me to install the 11.0.2. Illustrator update.
Can you tell me how to mount the .dmg file after downloading with Disk Utility? It's not just double click is it?

I concur with Alex that something is amiss with your system. Normally, double-clicking on a .dmg file will invoke DiskImageMounter which decompresses the .dmg image and puts a virtual drive on the Desktop, from which you can copy files or run an installer (this is what 'mounting' the .dmg disk image means). If you open a .dmg using Disk Utility, either via the 'Open Disk Image' command from Disk Utility's File menu of by control-clicking the .dmg file and selection Open With... to call up Disk Utility, you see a message window about "attaching disk image" while Disk Utility is mounting the mage.
That you're mounting a .dmg image, briefly seeing the mounted image on the Desktop, only to have the mounted image disappear, suggests you either have the Finder Preferences of the System Preferences> CDs&DVDs set to ignore the mounted hard drive images, or the sysytem prefernces are corrupted and think that's what they should be doing. Alex's suggestion on running Disk Utility> Repair Disk and Repair Permissions is the first step in troubleshooting the issue.
You can also check preferences by logging in to a different user account (if necessary, create a new, troubleshooting only account to work with a fresh set of default permissions and preferences) and seeing if that different account shows the same behavior; you can download and run Preferential Treatment; or launch Applications> Utilities> Terminal, then copy and paste the following exactly into Terminal and press return:
find ~/Library -name '*.plist' -exec /usr/bin/plutil -lint {} \;
The refernce to using ther Finder's Go menu was to look for the mounted disk image in the leftmost pane of the Finder window that opens; e.g., if I doble-click "gc593x.dmg", after a few seconds I'll see a hard drive icon "GraphicConverter" in the Finder window and also on the Desktop. If I click on the GraphicConverter hard drive icon in the Finder window, I see that mounted drive's contents. What happens when you click on the mounted drive's icon on your Mac?

Burning info CD's using Disk Utility?

Ok, I've got a combo drive (a few years old, on my iBook G3). I'm trying to burn information CDs using Disk Utility. I've got the dmg in disk utility, I select it and click burn. It then asks what speed I want to burn the disk at etc etc.
So, I select the slowest setting (4x) avaible. After its been burning for about 2 minutes, it said the burn ended because it had no burn underrun protection.
What is wrong?

A little more detail info on burning a CD that is not Copy Protected.....
Copy a CD that is not Copy Protected
http://docs.info.apple.com/article.html?artnum=42724
1. Launch Disk Utility at /Applications/Utilities.
2. Insert CD that is not copy protected.
3. In the upper pane, click on the 1st lower level of the CD path...
4. go to...Image>New... and select "Image from [disk/volume name]
5. In the dialog window that appears..select or type.......
• Name • location (desktop)
• Encryption mode (disregard)
• Image Format.(select DVD/CD master)
6. Click "Save"
Note. depending on your choice of image format...
• Selecting DVD/CD NMaster... .cdr will be created
• Selecting read-only or read/write.... dmg will be created.
7. The image file will appear in the lower Pane.
Note.... To checkout the steps so far....double-clicking on the image file will result in a disk image.(when you double-click on this, the contents will be revealed.
Steps (1-7) creates a image file of the CD.
8. Select the Image file that appears in the lower left Pane.
9. Select Images>Burn or... "Burn" from the Toolbar.
10. The CD drawer will open,remove the CD that you just copyed, insert blank CD and close drawer.
11. Burn options:
• Speed: Select a speed less than Maximum
• Verify Burns: (yes)
• Eject disc.. or .. Mount on desktop
12. Click on "Burn" in lower part of dialog.(Burn will change to Append If the Cd was previously appended)
13. And thats it...you are finished.
george

Disk Utility Error 254 **SOLVED**

This persistent problem has been a bugaboo for years and has been the cause of many long nights and huge frustration for me. You follow the standard instructions for putting an .iso on a USB using Restore in Disk Utility and it doesn't do it, returns an error 254.
Here's the workaround that worked for me, once I noticed the problem ISOs had no embedded partition information:
1) CONVERT the problem ISO to DMG in Disk Utility
2) DOWNLOAD "DMG Converter" (freeware) from the web.
3) Set convert tab, file format to ISO (JOLIET)/UDF HYBRID IMAGE.
4) Allow to run and finish. This seems to restore
5) Now use Disk Utility to Restore the new ISO to your USB drive.
Good luck.

I am having the same issues as from the post ...
http://discussions.apple.com/thread.jspa?threadID=1507263
The DMG i am using is one i created of my MBP using Disk utility onto my external HDD. Its now that i am restoring it i am getting this error. I have tried everything to restore this and spent countless hours, its 50GB files so each attempt takes ages.
Please anyone a solution or other possible clue as to fixing this? I really need to access the data that is in that DMG. When i try to open it in finder it says "no mountable file system."
Message was edited by: Boojo

Restoring with disk utility

Hello,
I recently erased my 8gb ipod to use it for some large file transferring. Before I did this, I made a .dmg copy using disk utility.
Now when I attempt to restore the ipod using this exact same .dmg file, disk utility tells me there's not enough space on the ipod! There was enough space before..... (and yes, I am trying to "erase and restore".)
Any ideas?

It's a 'gotcha.' You can't use Restore when booted from an Installer disc. You need to boot from the startup volume that you are going to clone if you use Disk Utility.
Backup Utilities
My personal recommendations are (order is not significant):
1. Retrospect Desktop (Commercial - not yet universal binary)
2. Synchronize! Pro X (Commercial)
3. Synk (Backup, Standard, or Pro)
4. Deja Vu (Shareware)
5. PsynchX 2.1.1 and RsyncX 2.1 (Freeware)
6. Carbon Copy Cloner (Donation Ware - 3.0 is a Universal Binary)
7. SuperDuper! (Commercial)
The following utilities can also be used for backup, but cannot create bootable clones:
1. Backup (requires a .Mac account with Apple both to get the software and to use it.)
2. Toast
3. Impression
4. arRSync
Apple's Backup is a full backup tool capable of also backing up across multiple media such as CD/DVD. However, it cannot create bootable backups. It is primarily an "archiving" utility as are the other two.
Impression and Toast are disk image based backups, only. Particularly useful if you need to backup to CD/DVD across multiple media.
Visit The XLab FAQs and read the FAQs on maintenance, optimization, virus protection, and backup and restore. Also read How to Back Up and Restore Your Files.

The difference between a .dmg file & a .cdr file (using Disk Utility) ?

Hi,
In particular, I created both from a DVD using Disk Utility.
When I chose "read only" a .dmg was created.
When I chose "DVD/CD Master" a .cdr was created.
They are exactly the same size.
Is there any difference ?
Thanks in advance.
Pat De Marco

HI Pat,
From Wikipedia: A file with the extension .dmg (an abbreviation for disk image) uses a disk image format commonly found on Mac OS X. The format allows secure password protection as well as file compression and hence serves both security and file distribution functions. Its most common function is the distribution of software over the Internet. When opened, DMG files are "mounted" as a drive within the Finder.
From: Wikipedia .cdr and ISO
ISO image
Filename extension .iso
Uniform Type Identifier public.iso-image
Type of format Disk image
Standard(s) ISO 9660
An ISO image is an archive file (a.k.a. disk image) of an optical disc using a conventional ISO (International Organization for Standardization) format that is supported by many software vendors. ISO image files typically have a file extension of .ISO but Mac OS X ISO images often have the extension .CDR. The name "ISO" is taken from the ISO 9660 file system used with CD-ROM media, but an ISO image can also contain UDF file system because UDF is backward-compatible to ISO 9660.
Carolyn
Message was edited by: Carolyn Samit

*.dmg *.cdr (Disk Utility)

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.dmg .cdr (Disk Utility)