.img vs .dmg vs .cdr??

I'm hoping someone can explain to me the differences between the disk image formats, and which is the best for archiving DVDs (like, to keep a copy on your computer and make more copies later). I have already-made DVDs that I want to save onto the computer as backup, as well as current projects that I'd like to save as disk images so I can delete their other resources.
Thanks!
Claire

Yeah, sorry about that, I posted this just before I saw the reply to the other post (had figured maybe I wasn't getting replies because it was in the wrong area of the board). Sorry, I'll mark this as answered now...
Claire

Similar Messages

When should i use .dmg and .cdr?

I am backing my software programs and would like to know if I should use the .cdr or .dmg type?
Does it matter? Are there differences in file sizes?

Zach84 wrote:
I agree, I have my TM running as well! I need to check out Super Duper.
Look at Carbon Copy Cloner too.
How does this differ from TM?
They have nothing to do with each other. Time Machine is a backup program. SuperDuper/Carbon Copy Cloner are archiving programs. Confuse the two at your own peril.
A backup program makes it easy to go back in time and restore one or more old versions of files. If you accidentally delete or overwrite data and don't notice it right away, it's no problem. You should have to think as little as possible for backups because any human intervention will make them less reliable.
An archiving program makes a snapshot in time. It is a great way to restore to a specific point in time where you know your data was good. It is fast and easy to restore. Yes, it can be bootable. Archiving takes longer than backups, requires much more human intervention, and can require much more storage media.
Disk Utility is also a perfectly good archiving program. It can make bootable copies just like SuperDuper/Carbon Copy Cloner. The 3rd party tools just make it quicker and easier to do. That is all and good, but they have tried to market themselves as back tools, which they aren't. Catastrophic failures are pretty rare. Do you really need to duplicate your disk on a regular basis for something that might happen every 4 years? If your primary hard disk is worn out from all the duplications, wouldn't your backup disk be in just as bad shape? Do you really need zero downtime? If you do, there are better solutions available.

.dmg vs .cdr

ok here is the problem, people are saying when copying a DVD you should select DVD/CD format from disk uility, but when i do that the copies do NOT work on anything. But when i choose .dmg format (compressed) it works, but why are people telling me if you choose .dmg its not going to work on standard players? because it does? And another thing, when i choose .cdr(dvd/cd master) it ask me for a password? why? and what does this password do? does it make it protected? Please help?
Sincerely,
John Cook

John:
Here's an Apple KB document which describes how to copy a DVD that was previously burned DVD-R video discs: How to copy previously-burned DVD-R video discs. It should give you what you need to know. Once the disk image is created burn it to disk with Disk Utility.
Hope this has been of some help. Good luck.
OT

.img vs .dmg

Can anyone tell me what the difference is?
tia
steve s
iMac Mac OS X (10.3.9)

thanks. It seems that I have used both for the same thing. I have used disk utility to create a .dmg of a dvd that I have created and I have created a .img of a dvd using iDvd. It seems that those are the same. I can use toast to burn a dvd or either. Is there a difference in the usage?
thanks
steve s
iMac Mac OS X (10.3.9)

"Image not recognized" on img or dmg files...

Hello all...
Anyone had the same problem? I have just updated to OS Maverick and I tried to install a firmware for my external RAID. Downloaded from the official website but no luck. I get an error message "Image not recognized". Tried to open it with stuffit or RAR expander but same problem...
Any advice?
Thanks s lot...

Possible solutions:
Download the file again.
Check if the file size matches what it says on the website. If the size is way off, then don't try to install it.
If the source website provides it, verify the checksum of the file. Google "mac verify checksum of a file".

Burn DVD/ dmg/cdr file question

Hi- What happened to the dmg files that used to work on external dvd/tv players?
I'm trying to copy a dvd (home movie/ no copy protection) from someone abroad. The region seems ok, the original plays on my computer, plays on my tv via a jvc dvd player and another phillips dvd player.
I make a copy of the original dvd, via making a disk image; the file format is not dmg but cdr. Burn is ok, will play in the computer, but WILL NOT play on the same tvs with the phillips dvd player, or the jvc dvd player. Any suggestions how I can get this to play via the dvd players? Is it related to now having the cdr files?
In the past I've made lots of home movies and was able to burn them to a dvd and they would play on the same dvd players. I think the file format was a dmg though. ??????

Yes. I see that on the old powerbook G4 and the new imac, the process is a little different, but playing around with this I see that if I burn the cdr image to the dvd it's fine,like as a backup for the disk image, but I assume it's not meant to play in an external dvd player. Is that right? When I burn the contents of the cdr image to a dvd and just get the video__ts folder, then it plays on the computers, and it does play on a newer, cheap phillips dvd player but not on the older jvc dvd player. The original dvd I wanted to copy was from outside the US, so I'm wondering if it's a region problem with the JVC.
Several years ago I did some work with imovie and idvd and burned dvd's and they worked fine in the JVC. The original dvd I was trying to copy today also works fine in the JVC. Just can't figure out what' the problem.

*.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

Disk Utlity can't burn .img files to disk

I'm newly digitizing old Beta tapes via a Canopus capture card. I've output my IMovie/iDVD projects to image files, but when I use Disk Utility to burn a DVD from the .img file I get nothing but verification errors and different checksums. I'm using Apple 4.7 Gb disks. The DVDs seem to play OK on my home Toshiba player, maybe with some stalling.
If I burn the iMovie/iDVD project directly to a DVD and then create a disk image file from that disk, Disk Utility burns successful copies from the .dmg file even on cheap-o Memorex disks.
I'm perplexed. This seems backwards. Could it be the difference between .img and .dmg files? Maybe I'm not using Disk Utility correctly in selecting/mounting/opening the image files...?I must say that Disk Utility Help is not very helpful.
I have the same problem on my new LaCie drive and the old SuperDrive.
G4 1GHz Mac OS X (10.3.9) IDVD 5.01, new LaCie drive

More info:
After further investigation I 'discovered' Disk Utility:Images:Convert in the Disk Utility menubar. When I converted .img files to .dmg they seem to burn easily and accurately. I wonder why this isn't documented.
I'm wondering what the functional difference is between .dmg and .cdr image files.
G4 1GHz Mac OS X (10.3.9)

Cannot mount .cdr

Hey all
Have a problem: cannot mount a .cdr image file. I get the message:
"Image isn't recognized"
I'm mounting on a iBook G4 with Leopard.
Any suggestions?
CCKolling

Found out myself -> all the .dmg and .cdr's had been damaged. nothing to do with the computer.
CCKolling

Restore BOOTCAMP from .dmg image - Unable to scan (invalid argument)

I'm having trouble getting my maching back in order after a crash. I'm running a MacBook Pro 13" mid-2009 with a Bootcamp partition. Last week my harddrive crashed or something and I wasn't able to boot into either drive. Using the Snow Leopard install DVD and Disk Utility I made .dmgs of the entire HD and each of the partitions (Mac HD and Bootcamp - maybe overkill but..). I have since been able to restore my Mac side from the image, even without installing OSX - I just restored from the image using Disk Util again and everything seems to work fine. But, now I've been trying to do the same thing with my Bootcamp side - I have a separate .dmg for that. Everything seems to go fine except that when I try to restore it tells me the image needs to be scanned and when I scan I get the error message: "Unable to scan BOOTCAMP.dmg (invalid argument)". I've tried using different schemes of compression/ no compression on the image, tried to convert to a .cdr then rename to .iso and restore using Windows' native Recovery option. I even tried Terminal - sudo asr restore -noverify -source _________ -target __________ , but it wouldn't let me drag and drop in the Bootcamp drive icon...
Now I don't know what to do but ask.
Has anyone solved this problem????

Hi, and thanks for your reply.
Is there anyway I can convert my .dmg or .cdr/.iso to something that winclone can use?
ps I did finally get Disk Utility to scan the image. I had to convert it to a compressed .dmg from the uncompressed one and it finished it fine but still in Restore in Disk Util. I can't set the destination as my bootcamp partition.
Looks like I'll have to reinstall everything then eh? Well thanks for your help.

How do i clear all the albums in Complete My Album?

I already have downloaded the songs i want and I want to clear off the leftover album icons.

OK:
http://www.apple.com/support/mac101/tour/
shows you where the desktop is, and the hard drive icon.
This document:
http://docs.info.apple.com/article.html?artnum=106161
shows you the different kinds of icons applications will give you. A dmg and an img file are the same icon for a virtual disk image file. When that file is double clicked, most application installers will be inside icons like this one:
If there is no installer program inside that icon, just drag the application to the Applications folder on your hard drive.
Once that is done, the above icon can be dragged to the trash to dismount the image file's virtual disk. When it is gone from your desktop, then the img or dmg file can be dragged to the trash. You can keep behind the img or dmg file and put it inside a folder inside your home folder which looks like this:
The home folder is inside your hard drive -> users folder
The desktop folder which includes everything on the desktop is inside the home folder.
I recommend creating your own folder with the File menu New submenu inside the Home folder to store backups of img and dmg and sit and zip files as well as any documents you want to keep.
When that is done, you can backup to other sources as my backup FAQ explains:
http://www.macmaps.com/backup.html
Once you are backed up.
A .dmg.gz and .dmg.zip file are zipped up image files which if double clicked will reveal the .dmg file.
A .sit file uses an old archive standard known as Stuffit, which can be expanded by http://www.allume.com/ 's Stuffit Expander.
Feel free to ask any additional questions.

How do I clear all the download Icons from my display?

My screen is so cluttered with download images, zip files which I unstuffed, etc.
I know this has probably been asked and answered somewhere, but I can't find it in my search in the forums.
Can I move them to trash or will that affect the download applications, etc?
Thanks.

OK:
http://www.apple.com/support/mac101/tour/
shows you where the desktop is, and the hard drive icon.
This document:
http://docs.info.apple.com/article.html?artnum=106161
shows you the different kinds of icons applications will give you. A dmg and an img file are the same icon for a virtual disk image file. When that file is double clicked, most application installers will be inside icons like this one:
If there is no installer program inside that icon, just drag the application to the Applications folder on your hard drive.
Once that is done, the above icon can be dragged to the trash to dismount the image file's virtual disk. When it is gone from your desktop, then the img or dmg file can be dragged to the trash. You can keep behind the img or dmg file and put it inside a folder inside your home folder which looks like this:
The home folder is inside your hard drive -> users folder
The desktop folder which includes everything on the desktop is inside the home folder.
I recommend creating your own folder with the File menu New submenu inside the Home folder to store backups of img and dmg and sit and zip files as well as any documents you want to keep.
When that is done, you can backup to other sources as my backup FAQ explains:
http://www.macmaps.com/backup.html
Once you are backed up.
A .dmg.gz and .dmg.zip file are zipped up image files which if double clicked will reveal the .dmg file.
A .sit file uses an old archive standard known as Stuffit, which can be expanded by http://www.allume.com/ 's Stuffit Expander.
Feel free to ask any additional questions.

Disk images, disk utility, and burning movie copies

I used to use a .dmg of my own movie files to create copies for playback. i used disk utility for this for years and have even used it successfully with OS 10.5....now suddenly burning from the same disk image in disk utility only ever creates a new .img or .dmg, never a copy for playback. this is my own movie, not a rented/copyrighted/purchased dvd., etc. what am i suddenly doing wrong, possibly?

Weird.
You could try this free app:
http://www.versiontracker.com/dyn/moreinfo/macosx/32275
Or Roxio Toast (which is not free, but a must-have)
Casper

Creating Disk Images for viewing on a PC

I created a data dvd of information for work on my iMac by dragging the folders that I needed onto the DVD. I then burned it in my super drive. I put the completed DVD into a pc and navigated through the files.
I created an image file (dmg and cdr) of the DVD on my iMac for future use in case someone else wanted a copy of the information.
When I burn the dmg or cdr image to a DVD, I can navigate through it with my iMac without any problems but when I put DVD into a PC, the PC says that it is a blank disk.
I guess my question is, how do I create an image so that I can burn it and use it on either a mac or a pc?

I created the image from a disk. I put the DVD I wanted to image in the super drive, opened Disk Utility, selected the DVD from the left side of the Disk Utility window. I then went to the menu: File - New - Disk Image From <Name of the DVD>. I tried to use different image formats (Read/Write, DVD/CD Master).
When I went to copy the dmg file, I selected it and then Burned it. It is readable in my iMac but not on a PC.

Issues with BootCamp and mounted windows 8 install disk

I've been trying to install Windows 8 from a mounted Windows 8 System Builder install disk. When I mount the ISO and try to use bootcamp to install windows 8 the bootcamp application will not recognize the install disk I have mounted. Any issues? I've also attempted to install the disk on USB with no luck. The reason I need the mounted ISO is because my DVD drive is busted. I created ISO on a friends macbook pro by using disk utility. I have the dmg file, cdr file, and iso file but have had no luck with any of them. Can anyone help? I'd really like not to have to have to buy an external DVD drive.

Google is your friend. Easy? Probably not but it appears doable. Proceed at your own risk.
http://arstechnica.com/information-technology/2012/11/no-support-no-problem-inst alling-windows-8-on-a-mac-with-boot-camp/

.img vs .dmg vs .cdr??

Similar Messages

Maybe you are looking for