How To Use Apple Repair Box
Need to create a new division, or re-format an external drive? There's no need to hunt downwardly paid partition managers or disk-management boot disks: your Mac includes a congenital-in partition manager and disk management tool known as Deejay Utility.
Disk Utility is fifty-fifty accessible from Recovery Mode, and then you tin partition your Mac's hard drive without having to create and load up any special bootable tools.
Accessing Disk Utility
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To admission the Disk Utility in macOS, just press Command+Space to open Spotlight search, blazon "Disk Utility" into the search box, and so printing Enter. You tin as well click the Launchpad icon on your dock, click the Other folder, and so click Disk Utility. Or, open a Finder window, click Applications in the sidebar, double-click the Utilities folder, and so double-click Disk Utility.
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To access the Disk Utility on a modernistic Mac—regardless of whether it even has an operating arrangement installed—reboot or boot up the Mac and hold Control+R as information technology boots. It'll boot into Recovery Mode, and you can click Disk Utility to open it up.
In Recovery Mode, macOS runs a special sort of recovery environment. This allows you to use Disk Utility to wipe your unabridged drive—or repartition it.
Segmentation Drives and Format Partitions
Disk Utility shows internal drives and connected external drives (like USB drives), also equally special image files (DMG files) that you lot tin mount and access as drives.
On the left side of the window you'll come across all mounted volumes.
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This annoyingly leaves out empty hard drives, only click Views > Show All Devices in the menu bar and you'll encounter a tree of drives and their internal partitions. Each "parent" drive is a separate concrete drive, while each little drive icon below it is a segmentation on that bulldoze.
To manage your partitions, click a parent drive and select the "Partition" heading. You lot can adjust the sectionalisation layout scheme hither. You can also resize, delete, create, rename, and reformat partitions.
Annotation: Many of these operations are destructive, and so be sure you have backups commencement.
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If you want to repartition your system drive, yous'll need to exercise this from within Recovery Way, with 1 exception: APFS volumes. APFS is Apple'southward new file system, the default on solid state drives every bit of macOS High Sierra, and it'southward got all sorts of clever tricks up its sleeve. One of them: volumes on the same bulldoze pool storage infinite, meaning you'll see two split up drives in Finder, only won't have to manage how much storage space each volume uses. To add a new APFS book, but select your arrangement drive, and and so click Edit > Add APFS in the menu bar. You lot'll see the in a higher place prompt.
Get-go Aid Repairs File System Problems
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If a hard drive is acting up, Deejay Utility's Kickoff Help function is the first thing y'all should endeavor. This feature checks the file system for errors and attempts to correct them, all without much intervention from you.
Simply click the drive y'all desire to check, and then click the "First Aid" button. Exist warned that these checks can accept a while, and running them on your arrangement drive will go out you with an unresponsive computer until it's washed.
Secure-Erase a Segmentation or Drive
The Erase button allows you lot to erase an entire hard deejay or partition. Y'all can also choose to but erase its costless space.
You can utilize this feature to securely wipe a difficult drive. Click a drive, and so click the "Erase" button, and so click "Security Options" to select a number of passes to overwrite the drive with. One pass should be adept enough, but yous tin e'er do a few more if yous feel like it. The maximum number is unnecessary.
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Annotation that this feature will only be useful on mechanical drives, as you lot shouldn't be able to recover deleted data from a solid state bulldoze. Don't perform a secure erase on a solid-land drive, such as the ones built into mod Mac Books—that will just wear downwardly the bulldoze for no advantage. Performing the "fastest" erase of the internal drive from recovery mode volition erase everything.
Create and Piece of work With Disk Images
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Click the File carte in Disk Utility and use the New menu to create bare disk images or deejay images containing the contents of a binder — these are .DMG files. You can so mountain that disk image file and write files into it. This is particularly useful because you tin can encrypt that DMG file, creating an encrypted container file that can store other files. You can so upload this encrypted DMG file to cloud storage locations or save it on unencrypted removable drives.
The Convert and Resize Epitome buttons will let you to manage that disk image from the Disk Utility window.
Copy Volumes and Restore Disk Images
The Restore feature allows you to re-create 1 volume to some other. You lot can utilize it to copy the contents of ane partitioning to another, or to copy a disk image to a partition.
You lot can also create a deejay image that contains an exact copy of an unabridged partition. Select the drive yous'd like to create an image of, and so click File > New Image > Image From [Segmentation Proper noun].
Y'all can later restore this disk paradigm file to a partitioning, erasing that partition and copying the data from the disk epitome to information technology.
RAID Setup
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The Disk Utility also allows you to set up RAID on a Mac: but click File > RAID Assistant in the bill of fare bar. Combine disks and partitions into 1 or more RAID sets and cull whether you want to mirror, stripe, or concatenate your information. This is an advanced feature most people won't need to use, merely information technology's there if yous demand it.
Mirroring (RAID 1) means information you write to the RIAD is stored on each partition or drive for failsafe purposes. If one bulldoze dies, your data is still available elsewhere.
Striping (RAID 0) will alternating disk writes betwixt ane drive and the other for faster speed. However, if one of the drives fails, you'll lose all the data — and so it's getting more speed at the expense of less reliability.
Concatenation (JBOD) allows you to combine different drives equally though they were one, useful in certain circumstances.
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The Disk Utility included with Mac Os X is powerful, and it should handle all the functions you need it to perform. It'due south a flake similar the Disk Management tool built into Windows, simply more capable and, thanks to Recovery Style, easier to access from outside the operating organisation.
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Source: https://www.howtogeek.com/212836/how-to-use-your-macs-disk-utility-to-partition-wipe-repair-restore-and-copy-drives/
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