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Disk Utility User Guide

Partitioning a disk divides it into individual sections, each of which acts as a separate volume.

Therefore you can clone GNU/Linux, MS windows, Intel-based Mac OS, FreeBSD, NetBSD, OpenBSD, Minix, VMWare ESX and Chrome OS/Chromium OS, no matter it's 32-bit (x86) or 64-bit (x86-64) OS. For these file systems, only used blocks in partition are saved and restored by Partclone. For best results, your external hard drive, thumb drive, SDHC or SDXC card, or other storage device should be formatted as Mac OS Extended, not FAT, ExFAT, or NTFS. And to function as a startup disk, it needs to be using a GUID partition map. Here's how to check: Connect your external storage device to your Mac.

However, with APFS, you shouldn’t partition your disk in most cases. Instead, create multiple APFS volumes within a single partition. With the flexible space management provided by APFS, you can even install another version of macOS on an APFS volume.

Important: If you’re partitioning your internal physical disk because you want to install Windows, use Boot Camp Assistant instead. Do not use Disk Utility to remove a partition that was created using Boot Camp Assistant. Instead, use Boot Camp Assistant to remove the partition from your Mac.

Add a partition

Important: As a precaution, it’s best to back up your data before creating new partitions on your device.

1. In the Disk Utility app on your Mac, select a volume in the sidebar, click the Partition button , then click Partition.

   Internal storage devices appear below the Internal section in the sidebar. External devices appear below the External section in the sidebar.

   When you select a volume that already has data on it, the pie chart shows a shaded area representing the amount of data on the volume and an unshaded area representing the amount of free space available for another volume. Disk Utility also shows whether the volume can be removed or resized.

   Note: If you see a small volume with an asterisk, the partition is smaller than can be represented at the correct scale in the chart.

2. Click the Add button .

3. Type a name for the volume in the Name field.

   For MS-DOS (FAT) and ExFAT volumes, the maximum length for the volume name is 11 characters.

4. Click the Format pop-up menu, then choose a file system format.

5. Enter the size or drag the resize control to increase or decrease the size of the volume.

6. Click Apply, click Partition, then click Continue.

   Click Show Details to view the step-by-step process of creating a new volume.

7. After the volumes are created, click Done.

After you partition a storage device, an icon for each volume appears in both the Disk Utility sidebar and the Finder sidebar.

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Delete a partition

WARNING: When you delete a volume or partition, all the data on it is erased. Be sure to back up your data before you begin.

1. In the Disk Utility app on your Mac, select a volume in the sidebar, click the Partition button , then click Partition.

2. In the pie chart, click the partition you want to delete, then click the Delete button .

   If the Delete button is dimmed, you can’t delete the selected partition.

3. Click Apply, then click Partition.

4. After the volume is deleted, click Done.

Erase a partition

1. In the Disk Utility app on your Mac, select the volume you want to erase in the sidebar.

2. Click the Erase button , then click Erase.

   If the Erase button is dimmed, you can’t erase the selected volume.

3. After the volume is erased, click Done.

Enlarge a partition on a storage device

If you have multiple partitions on a device and one of them is running out of space, you may be able to enlarge it without losing any of the files on it.

To enlarge a volume, you must delete the volume that comes after it on the device, then move the end point of the volume you want to enlarge into the freed space. You can’t enlarge the last volume on a device.

WARNING: When you delete a volume or partition, all the data on it is erased. Be sure to back up your data before you begin.

1. In the Disk Utility app on your Mac, select a volume in the sidebar, then click the Partition button .

2. In the pie chart, select the partition you want to delete, then click the Delete button .

3. Click Apply.

   The partition is removed, reformatted, and all free space is assigned to the previous partition.

4. Click Done.

Make sure that your storage device is properly formatted

For best results, your external hard drive, thumb drive, SDHC or SDXC card, or other storage device should be formatted as Mac OS Extended, not FAT, ExFAT, or NTFS. And to function as a startup disk, it needs to be using a GUID partition map. Here's how to check:

1. Connect your external storage device to your Mac.
2. Choose Apple menu () > About This Mac, then click the System Report button. Or hold down the Option key and choose Apple menu > System Information.
3. Select Storage from the sidebar, then select your storage device from the list of volumes. Make sure that the Partition Map Type shown for your storage device is GPT (GUID Partition Table):
   

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If your storage device isn't using a GUID partition map, you can follow these steps to create one with Disk Utility.This deletes all of the data stored on your device.

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• If you're using OS X El Capitan or later, select your external storage device in Disk Utility. (Select the disk name, not the volume name indented beneath it.) Then click Erase and choose the GUID partition map scheme and any Mac OS Extended format before erasing.
  
• If you're using OS X Yosemite or earlier, select your external storage device in Disk Utility. (Select the disk name, not the volume name indented beneath it.) Click the Partition tab, select your partition, then click the Options button. Select GUID Partition Table before partitioning.

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Aug 27, 2017 4:38 PM