How to create encrypted disk image?

In Disk Utility, I select to create a new image that is password protected. I'm prompted to save and give the image a password. It never ask for the size and starts "Reading whole disk". I don't want to encrypt my entire disk. This image might only be 5MB.
What steps do I take to create a DMG that is about 5MB and password protected?

Rename it in the Finder as you would any other item. If needed, choose Get Info from the File menu when the mounted image is selected in the sidebar.
(57123)

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Disk Utility - Create encrypted disk images super sloooow

Trying to create encrypted disk images via Disk Utility on my iMac (i7 8GB) is super-slow in 10.8. It worked quite fast in 10.7, but now it's super-slow and doesn't even seem to ever finish.
I've tried re-installing 10.8 with no difference.
Anyone else having trouble with this? Even a small dmg (~200MB) doesn't seem to work.
Unencrypted images seem to work OK (if not a little slow).
I realize that the encryption process will be slower but something is definately wrong with 10.8 disk utility in this regard. I have 1TB+ free space. I have tried with another user account as well.
My task was: (new disk image, read-write, 128bit encryption)
2012-09-03 08:59:59 -0400: Initializing…
2012-09-03 09:00:00 -0400: Creating…
2012-09-03 09:03:28 -0400: Copying… <<< seems to be stuck here...

Good morning,
Have you tried using Disk Utility from within the recovery mode? (Hold down CMD and R when booting)
I used to have this problem but creating them this way really improved the time.
Give it a go...
Rob

Problem creating encrypted disk image

I have just moved from an Aluminium PB G4 with 10.3.9, on which I successfully created encrypted disk images and sparse images.
I now want to do the same on a brand new WD My Book attached to the new Macbook Pro. I open Disk Utility and click New Image. But when I do so, there are fewer options than there are on the old machine. I only have
Save As
Where
Image Format
Encryption
No option for specifying size, no sparse option.
Also, if I try and create a dmg on the My Book, I get 'Unable to create "myfilename.dmg". (Invalid argument)'
Any suggestions? Thanks

V.K.'s suggestion worked. Thank you. But now I've found that I get the full set of options in Disk Utility too. Baffled.
In the week I've been using my new Macbook Pro, I seem to be getting eerily similar experiences, i.e. apps don't work right, then I quit and next time they behave themselves. Yes, I know it sounds weird.
Is this an appropriate place for me to ask further questions. Namely, what's the best place to find out about 1. read/write v. sparse disk v. sparse bundle? 2. partitions - should I used them, whatever they are? and 3. why are the bigger disk images called CDs and DVDs? If I want a passworded place to put files on my external drive, bigger than 500MB, is there any reason not to use one of the CD/DVD size options?
Thanks

Create encrypted disk image with OS install disk utility.

I thought to make a full backup of Macintosh HD, and followed instructions in /kb/ht1553. However, every time I tried to creae an encrypted disk image, it barfed with "Failed - User interaction required". I assume it needed the encryption password, but for some reason was unable to display a prompt for this. Anyone know how to fix this? Thanks, Stephen.

Create an encrypted sparse disk image instead of from folder, mount it, and then drag & drop your files into ii.

Disk Utility fails to create encrypted disk image

When creating a disk image using 256 bit encryption and a purely numeric password longer than 13 characters the following message appears:
Unable to create "ABC.dmg." (error -60008)
the error happens upon typing the 14th consecutive number into the Password field. I have created images under the same conditions in the past, Not sure if this is caused by Lion.

Looks like one of the drives is bad.
While it passed being zeored with Disk Utility, it failed about 15 minutes into a 'Certify' using SoftRAID.
Now waiting on a replacement drive from Newegg.

Can't create encrypted disk image

With Leopard, I have repeatedly followed the instructions for using Disk Utility to make an encrypted disk. All appears to go well...all fields appropriately filled, including 128 encryption. But when I hit create, either nothing happens, or I get a second Disk Utility starting window. In any case, I am not asked to create a password, and am unable to find any trace of the disk I thought I'd just created. Would welcome your thoughts.

While creating, make sure that it's saved to the desktop so you will know where it is supposed to be, at least.. Was wondering if posssibly you lost them. Look for the named disks in your home folder and in HD on chance they are there somewhere.
I know you went to Help but just making sure you are creating disks this way (below). Everything worked fine for me--
If things still don't work, turn off DU and move to the desktop "com.apple.DiskUtility.plist" in your home folder/library/preferences. A new file will be created when disk utility is turned on again. Deleting plist files don't usually don't solve problems but sometimes they can become corrupted.
Good luck
RM
1 choose File > New > Blank Disk Image.
2 Type a name for the image, and choose where you want to save it.
3 In the Volume Name field, type a name for the volume that appears when you open the disk image.
4 Choose the size of the disk image from the Size pop-up menu.
5 Be sure you choose a size that’s large enough to hold any changes and new documents you might add.
6 Choose an encryption option from the Encryption pop-up menu.
7 Use the default settings for the rest of the options:
8 Choose “Mac OS Extended (Journaled)” from the Volume Format pop-up menu.
9 Choose “Single partition - Apple Partition Map” from the Partitions pop-up menu.
10 Choose “read/write disk image” from the Format pop-up menu.
11 Click Save.
Enter a password, and click OK.
Disk Utility creates the disk image and mounts its volume on your desktop.
Copy the documents you want to protect to the volume.
If you want to erase the original documents so they can’t be recovered, drag them to the Trash and choose Finder > Secure Empty Trash.

Disk Utility create encrypted disk image hangs

I'm trying really, really hard to backup my data but apple is not making it easy for me.
I need my files encrypted for an offline backup. Time machine only allows home folder to be encrypted, and due to my home folder being on my SSD drive I cannot fit my files all in there, not by a long shot.
Using Disk Utility, I choose "new disk image from folder", and select "read only", 256-bit encryption. Some of the folders worked. However some will just hang for hours on "Creating Image, copying...". I can see at the destination the dmg file has stopped incrementing larger. It has reached the full size of the folder approximately. Does apple fail at some file types? I already ran disk repair several times to no avail. I don't know what else to try, it just doesn't want to work. All I want is an encrypted backup, that any OSX install can retrieve without any special software involved. Sometimes I'll get a very unhelpful error message "Operation not supported". Whatever that is supposed to mean. Google was no help so hoping for some insights here.

Create an encrypted sparse disk image instead of from folder, mount it, and then drag & drop your files into ii.

How to create a disk image for flash drive backup

I tried to follow the instructions here – http://www.apple.com/uk/pro/tips/lockyourdata.html – without success. How do I encrypt the contents of my memory stick?

There is another way to do this if you are a bit adventurous: the terminal. I don't have a lot of experience using the terminal for this, but I just tried it, and it worked, and very quickly (a few seconds to create a 5 gig sparse image). The "terminal" is in utilities, and gives you access to the UNIX underpinnings of os x. OS X is essentially a GUI for UNIX. If you decide to try this, be very careful, and enter the commands exactly as written.
1. make sure you have a backup of your folder that you want to encrypt.
2. a backup of your whole system wouldn't be a bad idea either
3. open terminal (applications> utilities)
4. select the following line:
hdiutil create -encryption -size 5g -type SPARSE -fs HFS+ -volname Image ~/Desktop/image
6. Do not select any spaces before the first "h" or after the last "e".
6.5 do command-C to copy what you just selected.
7. go back to terminal. You should see something like this:
arthurs-mac-mini:~ arthur$ (and then a little grey square)
8. In my case, the "arthurs-mac-mini" is the name of my computer, and the "arthur$" is the user account currently logged in. the grey square is like the cursor.
9. paste the line you copied and hit return
10. it should prompt you twice to enter a password. enter it and hit return after each.
11. your new sparse image should appear on your desktop. If you like you can change the name of it from "image" to something else.
12. you can then open the image and copy your folder contents to it. The image should resize itself automatically to whatever you put in it.
13. hope this helps. let me know how it turns out.

Trying To Create Encrypted Disk Images With Disk Utility.

I am trying to create encrypted read and write Disk Images of around 2 GB to 6 GB with Disk Utility.
More often than not the dmg is NOT encrypted.
It seems very hit and miss . . . . most of the time missing!
Is this process notoriously unreliable or am I likely to be doing something wrong?

I think you have cracked it Niel!
I made another, unchecking the Keychain box, and it worked perfectly.
I have been using a password which is used for other items.
Now the .dmg has been created can I check the Keychain box and if so what are the benefits?
I have never understood what the Keychain does.

HT5639 How to create ISO Disk image of a CD

thanks

Rename it in the Finder as you would any other item. If needed, choose Get Info from the File menu when the mounted image is selected in the sidebar.
(57123)

Unable to create an encrypted disk image in Lion

disk utility gives the error Unable to create "Volume.dmg." (error - 60008) when creating an encrypted disk image. I am using the following steps:
    1.    Open disk utility
    2.    Select the disk (internal or external) to create the image on
    3.    Select File>New>Blank Disk Image…
    4.    Save As: 'Volume'
    5.    Name: Volume
    6.    Size: 50GB
    7.    Format: Mac OS Extended (Journaled)
    8.    Encryption: 128-bit AES encryption
    9.    Image Format: read/write disk image
    10.    Click the Create button
    11.    Password dialog appears
    12.    When I enter a password the dialog closes after entering only a few characters i.e. before I've finished typing, and the following error message displays:
Unable to create "Volume.dmg." (error - 60008)
I have previously, successfully, created encrypted disk images in Snow Leopard, and I don't know why I can't in Lion
Does anyone have any ideas?

Thanks for this Thomas.
I've tried naming the image differently, but still received the error, I did however try different permutations for the password.
The error seems to happen if I use a purely numerical password string and occurs on input of the 10th numerical character, if I start with numerical character but use an alpha before the 9th number I can continue and create a password, and I can create a password if I start with an alpha and switch to numerals after the first alpha character, purely alphabetical passwords are fine too.
It seems that Lion doesn't like purely numerical passwords greater than 9 characters, whereas Snow Leopard wasn't so fussy. Seems it's a bit of a bug.
Thanks for your help

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

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

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

How do I encrypt my external hard drive and subsequently a specific file within it, using my Mac? I tried creating a disk image but permission was denied.

Encrypting an external hard drive and specific folders within. Permission denied using disk image.

VKP90 wrote:
When I tried to encrypt a single file within the hard drive itself, I got the following: Disk Utility Progress: Unable to create "Name of my file" (Permission Denied).
When I tried encrypting the entire hard disk itself, I got: A GUID Partition Table (GPT) partitioning scheme is required.
I have also currently used Time Machine on the external hard drive, along with saving other data. Hence, I am not sure if partitioning is going to delete any of this (a video I watched mentioned that using the + button when creating partitions retains current data). Backing up the external hard drive is out of the option since it is the back up to my Mac.
You can't encrypt a single file. I'm not sure what you did to try. You can make an encrypted disk image which begins with a folder, if desired. Or, you can just create a blank, encrypted disk image, then move your desired files into that.
While you could partition off the free space without erasing the disk, you cannot encrypt it because you need a GUID Partition table which requires you to repartition the entire drive, not just the free space.

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

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

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

Hello,
I have to encrypt a LARGE external Hard Drive for my work (a 1 Terabyte external drive, which comes to about 930 gigs to encrypt).
I have to do one of the regular encrypted disk images, not one of those expandable ones.
I know that encrypted disk images take a long time to create, as I’ve created smaller ones in the past and they take hours.
Does anyone know how long it will take to create an encrypted disk image of this size?
AND, since it will probably take quite a while, I was wondering if it is BAD for my MacBook Pro or the external drive itself to write information for this long of a period. I just want to make sure I don’t damage anything.
Thanks for any help.

I did a 400 GB one and it must have taken an hour to get the password prompt, a couple more for the creation, and another for formatting and mounting.
If you have a bed and sleep daily, as I suspect you do, start an hour before bed, enter the password and it should be done by morning.
You don't need a 900 GB image unless you have one 900 GB file which I doubt. Make one smaller one say 300, then copy it twice. The password will be the same in all 3 copies.
If you look at activity monitor not much is going on during all this so don't think the house will burn down (or your pants - see other question posted today).

How to create encrypted disk image?

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