This will first ask you to select a folder full of files. To create a compressed, read-only image, you can do one of two things:įollow the same steps above, however instead of New > Blank Disk Image., choose New > Disk Image From Folder.

Once completed, you'll have a new volume on your desktop and in the 'Computer' view where you can begin dropping files!

If you create a 'read/write disk image', then the image file will start at the maximum size specified in the dialog box.Īfter you save the disk image file, you'll be prompted for a password and verification. If you create a sparse bundle (newer, and may be more reliable) or a spare image (older, can become corrupted easily if it's open and your computer is shut down improperly) then the image file will start small and will grow as you add files to it, up to a maximum size you specify. Also, be sure to set a size for the disk image. Make sure to choose either '128-bit AES encryption (recommended)' or '256-bit AES encryption (more secure)' from the 'Encryption' menu. In the dialog that appears, you can specify where to save the disk image, the name of the volume, and choose the type of encryption: Open Disk Utility, which is under the 'utilities' folder of the 'Applications' folder.įrom the File menu choose New > Blank Disk Image. To create a new, empty encrypted disk image in OS X: However, if you create a compressed DMG, it will be read-only, so that may or may not work for you.

You can create OS X disk images which are compressed and/or encrypted. If you encrypt your home directory using FileVault, you're creating a spare bundle disk image. Many OS X applications are deployed on disk images. A disk image (or DMG file) is a file which, when opened, presents itself as a removable Mac OS X volume, similar to a removable hard drive. Yes, you can do this using the built-in Disk Images of Mac OS X.

Compress file with password mac