Making a DMG File on a Mac
DMG (a Disk Image) is a file which has the properties of a separate hard drive or CD. It has a size limit and options for encryption to keep your files safe and secure. How to make a DMG files?
This is an example ‘how to’ that will work with Mac OS X:
- Create a New Folder and place the files you would like in your disk image into this new folder.
- Right click (or CTRL-Click) the folder and select “Get Info” and note the size of its contents.
- Open Disk Utility (Applications > Utilities > Disk Utility)
- Click the “New Image” icon to create a new disk image. Enter a name for the Image, and select a size adequate for the size of your folder you created in Step 2. Set the encryption to “none” and Format to “read/write disk image.” or “DVD/CD Master.” See Tips to learn how to encrypt the image.
- Place the contents of the folder from Step 2 into the newly mounted disk image.
- Unmount the Disk Image by dragging its icon to the Trash. In the Finder window, you can also click the Eject symbol next to the mounted image.
That’s it… thanks to OS X built in ‘Disk Utility’ 
Btw.. here’s another tips in making DMG files:
- You can encrypt your Disk Image with a password if you would like your files to be private. Simply Select “AES-128″ under the “Encryption” drop-down menu. After you click “Create” and it will ask you to create a password for your files. If you add the password to your key chain, you will not have to enter your password to access the .dmg file when logged into your account.
- After you add your files to the image, you can unmount it and then click the “Convert” button in the toolbar. This will let you compress the image or change it to read only (or add encryption).
- When you double click a .dmg file, it will “Mount” on the desktop. This is the only way to access or modify the contents of the Image.
- A .dmg file can be a very easy way to send files from one Mac to another. Any Mac can mount and access the Disk Image on their computer.
Don’t forget, it’s wise to backup your data first! 
Mas Sakti,
apakah possible untuk buat dmg dari OS X itu sendiri? i mean the whole os. atau hanya bisa bikin dmg dari beberapa bagian dari OS X itu?
ini related to my problem sekarang. Folder utilities saya hilang, mungkin terhapus secara ga sengaja, jadinya semua aplikasi di dalamnya ilang semacam disk utility, disk copy, Grab dll.
apa bisa buat file DMG dari the whole folder Utilities itu?
Thanks
devaris last blog post..Jiwa Wiraswasta Keturunan Tionghoa
Belum pernah coba… tapi secara teorinya, harusnya bisa
Dulu pernah clone hardisk berisi OSX sebagai backup ke external HD (pakai aplikasi CCC). Bener2 dulpikasi seperti aslinya. Bila external HD tsb dipasang pada mac akan mounting layaknya DMG file. Bila external HD tersebut dipasang pada mac menggunakan firewaire bisa diboot sebagai default OS saat start-up (power btn -> pencet ‘option’ key buat memilih drive OS).
Jadi isi HD external tsb (OS X) sudah pasti bakal bisa dibuat disk image-nya. Pertanyaan selanjutnya seberapa besar ukuran file DMG hasilnya? dan seberapa lama waktu untuk me-mounting file DMG tersebut?
Untuk dmg sebesar 6.9 GB itu kira-kira membutuhkan waktu sekitar 1-2 menit untuk mounting.