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Repair a storage device in Disk Utility on Mac. Disk Utility can fix certain disk problems—for example, multiple apps quit unexpectedly, a file is corrupted, an external device doesn’t work properly, or your computer won’t start up. Disk Utility can’t detect or repair all problems that a disk may have. Sep 20, 2010  Map a Network Drive on a Mac. Map a network drive to Mac OS X that re-mounts after system reboot. This method allows you to reboot your Mac and have the mapped network drive / network share automatically connect and remount, appearing on the desktop of OS X or in the Finder sidebar. 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. Jul 05, 2017  The Disk Utility interface is the same one you’ll see on your Mac OS X desktop, but run it from here and it’ll be able to repair problems with your system drive. Use fsck in Single-User Mode. In some cases, even Safe Mode or Disk Utility in OS X Recovery won’t be enough to fix problems. Sep 20, 2010 Map a network drive to Mac OS X that re-mounts after system reboot. This method allows you to reboot your Mac and have the mapped network drive / network share automatically connect and remount, appearing on the desktop of OS X or in the Finder sidebar.

Disk Utility User Guide

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

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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. Xcode for mac os high sierra 10.13.6.

   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.

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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.

Apple Partition Map (APM) is a partition scheme used to define the low-level organization of data on disks formatted for use with 68k and PowerPCMacintosh computers. It was introduced with the Macintosh II.^[1]

Disks using the Apple Partition Map are divided into logical blocks, with 512 bytes usually belonging to each block. The first block, Block 0, contains an Apple-specific data structure called “Driver Descriptor Map” for the Macintosh Toolbox ROM to load driver updates and patches before loading from a MFS or HFS partition.^[2] Because APM allows 32 bits worth of logical blocks, the historical size of an APM formatted disk using small blocks^[3] is limited to 2 TiB.^[4]

The Apple Partition Map maps out all space used (including the map) and unused (free space) on disk, unlike the minimal x86 master boot record that only accounts for used non-map partitions. This means that every block on the disk (with the exception of the first block, Block 0) belongs to a partition.

Some hybrid disks contain both an ISO 9660 primary volume descriptor and an Apple Partition Map, thus allowing the disc to work on different types of computers, including Apple systems.

Intel-based Macs[edit]

For accessing volumes, both APM and GUID partitions can be used in a standard manner with Mac OS X Tiger (10.4) and higher. For starting an operating system, PowerPC-based systems can only boot from APM disks^[5] whereas Intel-based systems generally boot from GUID disks.^[1][6][7] Nevertheless, Intel-based Macs are able to boot from APM, GPT (GUID Partition Table) and MBR (Master Boot Record, using the BIOS-Emulation called EFI-CSM i.e. the Compatibility Support Module provided by EFI).

Intel-based models that came with Mac OS X Tiger (10.4) or Leopard (10.5) preinstalled had to be able to boot from both APM and GUID disks due to the installation media for these universal versions of Mac OS X, which are APM partitioned in order to remain compatible with PowerPC-based systems.^[8] However, the installation of OS X on an Intel-based Mac demands a GUID partitioned disk or will refuse to continue, the same way installation on a PowerPC-based system will demand an APM partitioned destination volume. Cloning an already installed OS X to an APM partition on Intel systems will remain bootable even on 2011 Intel-based Macs. Despite this apparent APM support, Apple never officially supported booting from an internal APM disk on an Intel-based system. The one exception for a universal version of Mac OS X (Tiger or Leopard) is an official Apple document describing how to set up a dual bootable external APM disk for use with PowerPC and Intel.^[9]

Layout[edit]

Each entry of the partition table is the size of one data block, which is normally 512 bytes.^[1][10] Each partition entry on the table is the size of one block or sector of data. Because the partition table itself is also a partition, the size of this first partition limits the number of entries to the partition table itself.

The normal case is that 64 sectors (64 × 512 = 32 KB) are used by the Apple Partition Map: one block for the Driver Descriptor Map as Block 0, one block for the partition table itself and 62 blocks for a maximum of 62 data partitions.^[11]

Each partition entry includes the starting sector and the size, but also a name, a type, a position of the data area and possible boot code. It also includes the total number of partitions in that partition table.^[12] This ensures that, after reading the first partition table entry, the firmware is aware of how many blocks more to read from the media in order to have processed every partition table entry. All entries are in big-endian byte-order.^{[citation needed]}

Partition identifiers[edit]

Types beginning with 'Apple_' are reserved for assignment by Apple, all other custom defined types are free to use. However registrationwith Apple is encouraged.

Partition status[edit]

Partition status is a bit field composed of the flags:

See also[edit]

• Amiga rigid disk block (RDB)
• Extended boot record (EBR)
• GUID Partition Table (GPT)
• Host protected area (HPA)
• Master boot record (MBR)

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References[edit]

1. ^ ^abc'Technical Note TN2166 – Secrets of the GPT'. Apple. Retrieved 2013-02-24. …a standard block size of 512 bytes… […] Apple did consider extending APM to support larger disks. However, as such a change would break all existing partitioning tools…
2. ^Mac OS: Technical overview of disk volume structures
3. ^Apple Support Communities: Guid Partition or Apple Partition? (2012)
4. ^MacTech Magazine: Apple's Transition from Apple Partition Map to the GUID Partition Table by Criss Myers
5. ^Apple Mailing List: Subject: Re: Apple Partition Scheme or GUID Partition SchemeArchived 2009-04-06 at the Wayback Machine, Timothy Standing, 2006-04-30
6. ^Apple Support Communities: Create a bootable clone using Disk Utility (2014): an example of problems trying to boot on an Intel Mac using an APM partitioned drive.
7. ^Apple Support Communities: Running Mavericks + FCPX on External Boot Drive? (2014): OS X Mavericks does not boot from APM partitioned drives.
8. ^OWC: Booting your Intel Mac to an APM-formatted drive, M. Christopher Stevens
9. ^Mac OS X 10.5: Creating and maintaining a bootable 'universal' external disk
10. ^Rebe, René; Klaus, Susanne (2007). 'Creating custom Linux solutions – Apple Partition Map'. T2 System Development Environment. While the original intent was to handle various block sizes, in practice only 512 byte blocks are supported.
11. ^'Yellow Dog Solutions – Attaching Firewire Disks to a Linux Box'. Fixstars Corporation. Archived from the original on 2009-10-13. Retrieved 2013-02-24. Comment: The command pdisk -l /dev/sda shows a size of 63 blocks for the Apple_partition_map. There is a multitude of examples like this to be found on the internet.
12. ^'IOApplePartitionScheme.h'. Apple. 2009. Retrieved 2016-08-07.

External links[edit]

• Mac OS: Technical overview of disk volume structures Overview of the elements of a disk volume / partition
• File System Forensic Analysis: PC-based Partitions – Apple partitions Detailed technical analysis of the structure of Apple's partition map.

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