Mac Size On Disk

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Disk Utility User Guide

You can use Disk Utility to create a disk image, which is a file that contains other files and folders.

Note: You can burn information to a CD or DVD using the Burn command in the Finder. See Burn CDs and DVDs.

Create a blank disk image for storage

You can create an empty disk image, add data to it, then use it to create disks, CDs, or DVDs.

1. In the Disk Utility app on your Mac, choose File > New Image > Blank Image.

2. Enter a filename for the disk image, add tags if necessary, then choose where to save it.

   This is the name that appears in the Finder, where you save the disk image file before opening it.

3. In the Name field, enter the name for the disk image.

   This is the name that appears on your desktop and in the Finder sidebar, after you open the disk image.

4. In the Size field, enter a size for the disk image.

5. Click the Format pop-up menu, then choose the format for the disk:

   • If the disk image will be used with a Mac that has a solid state drive (SSD) and uses macOS 10.13 or later, choose APFS or APFS (Case-sensitive).

   • If the disk image will be used with a Mac with macOS 10.12 or earlier, choose Mac OS Extended (Journaled) or Mac OS Extended (Case-sensitive, Journaled).

   • If the disk image will be used with a Mac or Windows computer and is 32 GB or less, choose MS-DOS (FAT); if it's over 32 GB, choose ExFAT.

6. To encrypt the disk image, click the Encryption pop-up menu, then choose an encryption option.

7. Click the Partitions pop-up menu, then choose a partition layout.

8. Click the Image Format pop-up menu, then choose an option:

   • Sparse bundle disk image: Same as a sparse disk image (below), but the directory data for the image is stored differently. Uses the .sparsebundle file extension.

   • Sparse disk image: Creates an expandable file that shrinks and grows as needed. No additional space is used. Uses the .sparseimage file extension.

   • Read/write disk image: Allows you to add files to the disk image after it's created. Uses the .dmg file extension.

   • DVD/CD master: Changes the size of the image to 177 MB (CD 8 cm). Uses the .cdr file extension.

9. Click Save, then click Done.

   Disk Utility creates the disk image file where you saved it in the Finder and mounts its disk icon on your desktop and in the Finder sidebar.

10. In the Finder, copy your files to the mounted disk image, then eject it.

11. Restore the disk image to a disk.

    For more information about disk image types, see the manual (man) page for hdiutil.

Create a disk image from a disk or connected device

You can create a disk image that includes the data and free space on a physical disk or connected device, such as a USB device. For example, if a USB device or volume is 80 GB with 10 GB of data, the disk image will be 80 GB in size and include data and free space. You can then restore that disk image to another volume.

1. In the Disk Utility app on your Mac, select a disk, volume, or connected device in the sidebar.

2. Snapchat on mac os. Choose File > New Image, then choose 'Image from [device name].'

3. Enter a filename for the disk image, add tags if necessary, then choose where to save it.

   This is the name that appears in the Finder, where you save the disk image file before opening it.

4. Click the Format pop-up menu, then choose an option:

   • Read-only: The disk image can't be written to, and is quicker to create and open.

   • Compressed: Compresses data, so the disk image is smaller than the original data. The disk image is read-only.

   • Read/write: Allows you to add files to the disk image after it's created.

   • DVD/CD master: Can be used with third-party apps. It includes a copy of all sectors of the disk image, whether they're used or not. When you use a master disk image to create other DVDs or CDs, all data is copied exactly.

5. To encrypt the disk image, click the Encryption pop-up menu, then choose an encryption option.

6. Click Save, then click Done.

   Disk Utility creates the disk image file where you saved it in the Finder and mounts its disk icon on your desktop and in the Finder sidebar.

Important: Don't create a disk image of a disk that you believe to be failing or that contains corrupted information. The disk image may not serve as a reliable backup.

For technical information about creating a restore disk image, see the Apple Software Restore (ASR) manual (man) page.

Create a disk image from a folder or connected device

You can create a disk image that contains the contents of a folder or connected device, such as a USB device. This method doesn't copy a device's free space to the disk image. For example, if a USB device or volume is 80 GB with 10 GB of data, the disk image will be 10 GB in size and include only data, not free space. You can then restore that disk image to another volume.

1. In the Disk Utility app on your Mac, choose File > New Image, then choose Image from Folder.

2. Select the folder or connected device in the dialog that appears, then click Open.

3. Enter a filename for the disk image, add tags if necessary, then choose where to save it.

   This is the name that appears in the Finder, where you save the disk image file before opening it.

4. To encrypt the disk image, click the Encryption pop-up menu, then choose an encryption option.

5. Click the Image Format pop-up menu, then choose an option:

   • Read-only: The disk image can't be written to, and is quicker to create and open.

   • Compressed: Compresses data, so the disk image is smaller than the original data. The disk image is read-only.

   • Read/write: Allows you to add files to the disk image after it's created.

   • DVD/CD master: Can be used with third-party apps. It includes a copy of all sectors of the disk image, whether they're used or not. When you use a master disk image to create other DVDs or CDs, all data is copied exactly.

   • Hybrid image (HFS+/ISO/UDF): This disk image is a combination of disk image formats and can be used with different file system standards, such as HFS, ISO, and UDF.

6. Click Save, then click Done.

   Disk Utility creates the disk image file where you saved it in the Finder and mounts its disk icon on your desktop and in the Finder sidebar.

For technical information about creating a restore disk image, see the Apple Software Restore (ASR) manual (man) page.

Create a secure disk image

If you have confidential documents that you don't want others to see without your permission, you can put them in an encrypted disk image.

Note: If you want to protect the contents of the system disk, turn on FileVault using the FileVault pane of Security & Privacy Preferences.

1. In the Disk Utility app on your Mac, choose File > New Image > Blank Image.

2. Enter a filename for the disk image, add tags if necessary, then choose where to save it.

   This is the name that appears in the Finder, where you save the disk image file before opening it.

3. In the Name field, enter the name for the disk image.

   This is the name that appears on your desktop and in the Finder sidebar, after you open the disk image.

4. In the Size field, enter a size for the disk image.

5. Click the Format pop-up menu, then choose a format:

   • If you're using the encrypted disk image with a Mac computer using macOS 10.13 or later, choose APFS or APFS (Case-sensitive).

   • If you're using the encrypted disk image with a Mac computer using macOS 10.12 or earlier, choose Mac OS Extended (Journaled) or Mac OS Extended (Case-sensitive, Journaled).

6. Click the Encryption pop-up menu, then choose an encryption option.

7. Enter and re-enter a password to unlock the disk image, then click Choose.

   WARNING: If you forget this password, you won't be able to open the disk image and view any of the files.

8. Use the default settings for the rest of the options:

   • Click the Partitions pop-up menu, then choose Single partition - GUID Partition Map.

   • Click the Image Format pop-up menu, then choose 'read/write' disk image.

9. Click Save, then click Done.

   Disk Utility creates the disk image file where you saved it in the Finder and mounts its disk icon on your desktop and in the Finder sidebar.

10. In the Finder , copy the documents you want to protect to the disk image.

11. If you want to erase the original documents so they can't be recovered, drag them to the Trash, then choose Finder > Empty Trash.

When you're finished using the documents on the secure disk image, be sure to eject the disk image. As long as it's available on your desktop, anyone with access to your computer can use the documents on it.

To access the data in a disk image, double-click it. It appears on your desktop, and you can add, remove, and edit files on it just as you would with a disk.

When you attach a storage disk to a Mac with the purpose of erasing or repartitioning it, you'll be presented with the option of selecting one of the three available partition maps: GUID Partition Map, Master Boot Record, and Apple Partition Map. In this article we will explain what a partition scheme is and which one to pick when formatting a drive.

What Is a Partition?

The fixed-sized subset of a disk drive treated as an individual unit by the operating system (in our case macOS) is defined as a partition. On every drive there are multiple partitions, and for this you will need a partition table or partition map – maintained by the operating system – to detail the status of the partitions.

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GUID Partition Map

This is a standard for the layout of the partition table on a storage disk using globally unique identifiers (GUIDs). As part of the Unified Extensible Firmware Interface (UEFI) standard, GUID is a bootable standard for systems with EFI firmware such as macOS. Non-Intel Macs won't support this bootable standard, hence the only option available to them is the Apple Partition Map (APM).

Apple Partition Map

Used on disks formatted for use with 68k and PowerPC Macs, the Apple Partition Map is the scheme that defines how the data is organized. Starting with OS X Tiger, both APM and GUID partitions can be used for accessing volumes, but PowerPC-based Macs can only boot from APM disks. While Intel-based Macs generally boot from a GUID Partition Table, they are all able to start the operating system from APM and Master Boot Record (MBR) using the BIOS-Emulation called EFI-CSM.

Master Boot Record

Introduced by IBM in 1983 to support the 10MB hard disk, the Master Boot Record is a type of boot sector developed for use with IBM PC systems. It is currently used for Windows partitions formatted as MS-DOS (FAT) or ExFAT.

Choosing a Partition Map

Now you know which partitioning map is which, the next time you insert an external drive or want to partition the built-in storage disk of the Mac, it will be easier to choose between the available options.

When formatting or erasing a volume with Disk Utility, you'll see a format menu prompt asking you to choose from:

• Mac OS Extended (Journaled)
• Mac OS Extended (Journaled, Encrypted)
• Mac OS Extended (Case-sensitive, Journaled)
• Mac OS Extended (Case-sensitive, Journaled, Encrypted)
• MS-DOS (FAT)
• ExFAT
• APFS (macOS High Sierra's new file system)
• APFS (Encrypted)
• APFS (Case-sensitive)
• APFS (Case-sensitive, Encrypted).

Be aware that APFS is compatible only with macOS High Sierra and higher, so earlier versions of OS X or macOS won't mount an APFS volume. If you want maximum reach, Mac OS Extended (Journaled) is the right choice.

Below the file system format, the Disk Utility dialog box will list another contextual menu, the partition map scheme, which gives you another great tool to create targeted volumes. If you are looking to format a disk that will be shared with Windows users, the MBR scheme and MS-DOS (FAT) are the best choices. For drives used with Intel-based Macs only, the GUID Partition Map should the option to go for.

If you don't see the partition map scheme option, it is likely because Disk Utility doesn't list all volumes. This will prohibit Disk Utility from erasing the disk and show you an error message. To address this issue, you should click on the View button located in the top-left side of the Disk Utility dialog box and select 'Show All Volumes'. From that point on, Disk Utility will ask for your partition map preference, and the formatting process will be smoother.

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