Erasing a disk or volume permanently deletes all of its files. How to erase a disk Proceed based on whether you're erasing your startup disk or some other disk. Your startup disk is the disk volume that your Mac started up from.
By default it's the disk built into your Mac, named Macintosh HD. The steps above also work when erasing a storage device that you're not using as a startup disk.
And you don't need to delete data volumes first: just select your disk in Disk Utility, then click Erase. In some circumstances, you might need to change the partition map scheme while erasing. If you're following instructions that require choosing a scheme, the steps in Disk Utility differ from the steps above.
Are you formatting the disk that came built into your Mac? Are you about to install macOS High Sierra or later on the disk? If you need to erase your disk before installing High Sierra or later for the first time on that disk, choose Mac OS Extended Journaled. Are you preparing a Time Machine backup disk or bootable installer? Will you be using the disk with another Mac? Disk Utility tries to detect the type of storage and show the appropriate format in the Format menu.
If Disk Utility shows the sidebar, but your disk doesn't appear within it, disconnect all nonessential devices from your Mac. If the disk is external, leave it connected, but make sure that it's turned on and connected directly to your Mac using a good cable. Then restart your Mac and try again. Learn how to get your Mac ready for service. Erase a startup disk Start up from macOS Recovery. Then click Continue. Make sure that the sidebar in Disk Utility shows the name of your startup disk.
The volume representing your startup disk is Macintosh HD, unless you renamed it. Don't see it? When you're asked to confirm, click the Delete button. Do not click Delete Volume Group. Do the same to delete other volumes you might have on your startup disk—except the volume named Macintosh HD.Joinsubscribers and get a daily digest of news, geek trivia, and our feature articles.
Choosing a file system is basically choosing between these three options. First released init offers all sorts of benefits over Mac OS Extended, the previous default. For one thing, APFS is faster: copying and pasting a folder is basically instantaneous, because the file system basically points to the same data twice. There are also a number of reliability improvements, making things like corrupted files a lot less common.
There are a lot of upsides here. Reverse compatibility. To this day, it remains the default file system for mechanical and hybrid hard drives, both while installing macOS and while formatting external drives. ExFat should basically only be used on drives that need to work with both Windows and macOS computers. The format dates back toand was made by Microsoft to provide some of the cross-platform compatibility of the older FAT32 format without the file and partition size limitations.
Sure, you could read a Mac formatted drive on Windows or read a Windows formatted drive on a Macbut both solutions either cost money or are unstable. So despite the disadvantages, ExFAT is your best option for cross-platform hard drives.
To be clear, you can use capital letters in file names either way. Case Sensitivity mostly determines whether the file system sees capital letters as different. The file system sees the file names as identical, even if they look different to you. Presumably, a case-sensitive file system was just seen as less user-friendly. Today, enabling case sensitivity could break some Mac apps that expect a case-insensitive file system. The main downside is that forgetting the encryption key means losing access to your files.
Do not encrypt a drive unless you can remember the key, or unless you have somewhere secure to store it. The other potential downside to encryption is performance. The Best Tech Newsletter Anywhere.
How to Install macOS Mojave on HFS+ and Avoid APFS
Joinsubscribers and get a daily digest of news, comics, trivia, reviews, and more. Windows Mac iPhone Android. Smarthome Office Security Linux. The Best Tech Newsletter Anywhere Joinsubscribers and get a daily digest of news, geek trivia, and our feature articles.And therefore, in order to avoid APFS conversion, you need to find out an alternative way. Interestingly, there are two distinct different ways to install macOS Mojave without APFS conversion and we have discussed each with step by step instruction and screenshots.
Video guide will be uploaded soon. However, you need to create a macOS installer media. Upgrading directly from macOS installer downloaded from App Store is not possible. If you face any issue, comment down below and we will get back to you ASAP with the right solution.
In this method, you will be installing macOS Mojave You can read this post on How to install macOS on external drive for more details. After installing Mojave, follow these instructions. Now disconnect external drive and reboot system normally.
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Leave a Reply Cancel reply. Loading… 0. Like my blog? Thank You!To start the conversation again, simply ask a new question. Still using MacOS Sierra. Has that been resolved with Mojave? Has anyone with a Fusion drive experienced performance issues or file corruption since upgrading?
Will APFS be an issue? Posted on Nov 26, AM. How to erase a disk for Mac - Apple Support. Nov 27, AM. Page content loaded.
According to Apple's support document:. Fusion Drives and traditional hard disk drives HDDs aren't converted. It just didn't convert them to APFS. Mojave does. There's only so many times people can say the same thing. I have a 1TB Fusion drive on my iMac 14,2 that was automatically converted to APFS during the Mojave install process and have not experienced any issues or problems at all.
Nov 27, AM in response to dialabrain In response to dialabrain.
My question was specifically about APFS since then. To All, Thank You. I wanted to mark everyone's replies as helpful. However, the site is limiting me to two occurrences.Mojave was announced at Apple's Worldwide Developers Conference on June 4,and was released to the public on September 24, The operating system's name refers to the Mojave Desert and is part of a series of California -themed names that began with OS X Mavericks.
It also includes a much more comprehensive " dark mode ", and is the final version of macOS to support bit application software. The developer preview of the operating system was released for developers the same day,  followed by a public beta on June The most recent update was on September 26, Some features are not available on all compatible models.
The graphics frameworks OpenGL and OpenCL are still supported by the operating system, but will no longer be maintained; developers are encouraged to use Apple's Metal library instead. OpenGL is a cross-platform graphics framework designed to support a wide range of processors.
At the time, moving to OpenGL allowed Apple to take advantage of existing libraries that enabled hardware acceleration on a variety of different GPUs. As time went on, Apple has shifted its efforts towards building its hardware platforms for mobile and desktop use.
Metal makes use of the homogenized hardware by abandoning the abstraction layer and running on the "bare metal". The MoltenVK library can be used as a bridge, translating most of the Vulkan 1. Continuing the process started in macOS High Sierra In macOS Mojave New data protections require applications to get permission from the user before using the Mac camera and microphone or accessing system data like user Mail history and Messages database. Mojave features changes to existing applications as well as new ones.
Safari 's Tracking Prevention features now prevent social media "Like" or "Share" buttons and comment widgets from tracking users without permission. The browser also sends less information to web servers about the user's system, reducing the chance of being tracked based on system configuration. Screenshot can capture a selected area, window or the entire screen as well as screen record a selected area or the entire display. Participants can join in mid-conversation.
A new 'Discover' tab highlights new and updated apps; Create, Work, Play and Develop tabs help users find apps for a specific project or purpose. With Home, Mac users can control their HomeKit-enabled accessories to do things like turn lights off and on or adjust thermostat settings. Voice Memos lets users record audio e.
Stocks delivers curated market news alongside a personalized watchlist, with quotes and charts. Mojave introduces "Dark Mode", a Light-on-dark color scheme that darkens the user interface to make content stand out while the interface recedes.Apple File System is optimized for flash and solid-state drive storage, with a primary focus on encryption.
The specification for software encryption was documented later. The file system can be used on devices with relatively small or large amounts of storage. It uses bit inode numbers,  and allows for more secure storage. Clones allow the operating system to make efficient file copies on the same volume without occupying additional storage space. Changes to a cloned file are saved as delta extentsreducing storage space required for document revisions and copies.
Apple File System supports snapshots for creating a point-in-time, read-only instance of the file system.
How to erase a disk for Mac
Apple File System natively supports full disk encryption and file encryption with the following options:. APFS supports bit inode numberssupporting over 9 quintillion files 2 63 on a single volume.What is APFS? - The Apple File System Explained
Apple File System uses checksums to ensure data integrity for metadata. Apple File System is designed to avoid metadata corruption caused by system crashes. Instead of overwriting existing metadata records in place, it writes entirely new records, points to the new ones and then releases the old ones, an approach known as copy-on-write. This avoids corrupted records containing partial old and partial new data caused by a crash that occurs during an update.
All three are Lempel-Ziv -type algorithms. APFS adds the ability to have multiple logical drives referred to as volumes in the same container where free space is available to all volumes in that container block device.
Apple File System does not provide checksums for user data. Enumerating files, and any inode metadata in general, is much slower on APFS when it is located on a hard disk drive. Despite the ubiquity of APFS volumes in today's Macs and the format's introduction, third-party repair utilities continue to have notable limitations in supporting APFS volumes, due to Apple's delayed release of complete documentation.
It has been packaged into Debian and Ubuntu software repositories. From Wikipedia, the free encyclopedia. September 21, Digital Investigation. Apple Developer. Retrieved May 25, Retrieved February 2, If you install macOS on an additional volume of your startup disk, you can switch between that macOS and the macOS on your other volume, as if each were on a separate disk.
And because storage space is shared across APFS volumesyou don't need to reserve space for the new volume. Its size automatically adjusts to fit your content.
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Find out which format your startup disk is using. You don't need to reserve storage space for the new volume, but macOS needs as much as 20GB of available space to install, depending on the version of macOS. If you don't have enough space, the installer will let you know.
Beta software is software that is still in development, so some apps and services might not work as expected. When the installer opens and you're asked to choose where to install, click Show All Disks, then select the new volume. To find the latest updates for each version of macOS, check for software updatesthen start up from the other volume and check for software updates again.
The space it occupies doesn't automatically adjust to fit your content, so you must manually size the partition. Learn how to add a volume to a device formatted as Mac OS Extended. In the sidebar, select your existing APFS volume. These options are available only when an APFS volume is selected.
The new volume will also appear in the Finder, as if it were a separate disk.
You can now quit Disk Utility. The keys you press at startup determine which macOS is installed.
Or press and hold the Option key during startup. When prompted, choose the volume that you want to start up from. Keep the macOS on each volume up to date To find the latest updates for each version of macOS, check for software updatesthen start up from the other volume and check for software updates again.
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