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Erasing a disk or volume permanently deletes all of its files. Before continuing, make sure that you have a backup of any files that you want to keep.
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. If you're selling, giving away, or trading in your Mac, you should erase your startup disk.
Erase a startup disk
- Start up from macOS Recovery.
- Select Disk Utility from the Utilities window in 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?
- Look for a ”Data” volume with the same name, such as ”Macintosh HD - Data.” If you have such a volume, select it. Then choose Edit > Delete APFS Volume from the menu bar, or click the remove volume button (–) in the Disk Utility toolbar. Do the same to delete any other volumes you might have on your startup disk—except the volume named Macintosh HD.
- Now select Macintosh HD.
- Click the Erase button or tab, then complete these items:
- Name: Enter a name that you want the volume to have after you erase it, such as Macintosh HD.
- Format: Choose either APFS or Mac OS Extended (Journaled) to format as a Mac volume. Disk Utility shows the recommended Mac format by default.
- Click Erase to begin erasing. You might be prompted to enter your Apple ID.
- When done, quit Disk Utility to return to the Utilities window.
- If you want your Mac to be able to start up from this volume again, choose Reinstall macOS from the Utilities window.
Erase some other disk
The steps above also work when erasing a storage device that you're not using as a startup disk. However, in that case it's not necessary to open Disk Utility from macOS Recovery: you can instead open it from the Utilities folder of your Applications folder. And you don't need to delete data volumes first: just select your disk in Disk Utility, then click Erase.
How to change the partition map (scheme) of a disk
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.
- After opening Disk Utility, choose View > Show All Devices from the menu bar.
- The sidebar now shows not just volumes, but also the disks (devices) that contain those volumes. In the following example, APPLE SSD is the disk, Container disk1 is a container on that disk, and Macintosh HD is a volume in that container. (Only APFS-formatted disks have containers.)
- Select the disk that you want to erase, such as Apple SSD.
- Check the information shown on the right side of the window to find out which partition map is currently in use:
- GUID Partition Map is appropriate for Mac disks.
- Master Boot Record is appropriate for secondary or external drives used with a PC or Boot Camp.
- If the partition map is not appropriate for the disk's intended use, click the Erase button or tab, then complete these items:
- Name: Enter a name that you want the disk to have after you erase it, such as Apple SSD.
- Format: To format as a Mac disk, choose either APFS or Mac OS Extended (Journaled). Disk Utility shows a compatible format by default.
- Scheme: Choose the appropriate partition map scheme.
- Click Erase to begin erasing. If you're erasing your startup disk, you might be prompted to enter your Apple ID.
- Quit Disk Utility when done.
Why erase a disk
You can erase a disk or volume at any time, including in circumstances such as these:
- You want to quickly and permanently erase all content from your Mac and restore it to factory settings, such as when you're selling, giving away, or trading in your Mac.
- You're changing the format of a disk, such as from a PC format (FAT, ExFAT, or NTFS) to a Mac format (APFS or Mac OS Extended).
- You received a message that your disk isn't readable by this computer.
- You're trying to resolve a disk issue that Disk Utility can't repair.
- The macOS installer doesn't see your disk or can't install on it. For example, the installer might say that your disk isn't formatted correctly, isn't using a GUID partition scheme, contains a newer version of the operating system, or can't be used to start up your computer.
- The macOS installer says that you may not install to this volume because it is part of an Apple RAID.
About APFS and Mac OS Extended
Disk Utility in macOS High Sierra or later can erase most disks and volumes for Mac using either the newer APFS (Apple File System) format or the older Mac OS Extended format, and it automatically chooses a compatible format for you.
Identify the current format
If you want to know which format is currently in use, use any of these methods:
- Select the volume in the Disk Utility sidebar, then check the information on the right. For more detail, choose File > Get Info from the Disk Utility menu bar.
- Open System Information and select Storage in the sidebar. The File System column on the right shows the format of each volume.
- Select the volume in the Finder, then choose File > Get Info from the menu bar. The Get Info window shows the Format of that volume.
Choose between APFS and Mac OS Extended
If you want to change the format, answer these questions:
Are you formatting the disk that came built into your Mac?
If the built-in disk came APFS-formatted, don't change it to Mac OS Extended.
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). During installation, the macOS installer decides whether to automatically convert to APFS—without erasing your files:
- macOS Mojave or later: The installer converts from Mac OS Extended to APFS.
- macOS High Sierra: The installer converts from Mac OS Extended to APFS only if the volume is on an SSD or other all-flash storage device. Fusion Drives and traditional hard disk drives (HDDs) aren't converted.
Are you preparing a Time Machine backup disk or bootable installer?
Choose Mac OS Extended (Journaled) for any disk that you plan to use with Time Machine or as a bootable installer.
Will you be using the disk with another Mac?
If the other Mac isn't using High Sierra or later, choose Mac OS Extended (Journaled). Earlier versions of macOS don't mount APFS-formatted volumes.
Disk Utility tries to detect the type of storage and show the appropriate format in the Format menu. If it can't, it chooses Mac OS Extended, which works with all versions of macOS.
If your disk doesn't appear in Disk Utility
If Disk Utility doesn't show a sidebar, choose View > Show Sidebar from the menu bar.
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. If your disk still doesn't appear, your disk or Mac might need service. Learn how to get your Mac ready for service.
Learn more
- If you can't start up from macOS Recovery, you can instead use a different startup disk, if you have one.
Is your Windows PC running a little slowly? It’s not your imagination: over time hard drives accumulate all kinds of things that slow things down. PC optimization software can’t solve obsolescence.so you can solve by this softwares. Top best ram cleaner software window/ mac 2019 are following.
also check- best ssd health check software / best junk file cleaner software

1-Memory Cleaner X | macOS
Memory Cleaner X monitors your memory usage and cleans up your Mac’s memory, increasing performance. Cached memory will take up the memory required for brand new apps, and Memory Cleaner X will increase performance by cleanup cached memory. Memory Cleaner X additionally monitors RAM usage on your laptop, and you’ll liberate unused memory in mere one click. the appliance monitors RAM usage on your laptop and frees up unused memory with one click. With Memory Cleaner X, you’ll simply manage your memory usage. Associate in Nursing animated standing icon within the menu bar shows you the share of memory being employed, furthermore as memory cleanup being run.
2-CleanMem Free | Windows
CleanMem continues to be a collection it and forget program and is completely free. once you install CleanMem it’ll motorcar run each fifteen min by the Windows Task hardware. Once put in it’s set it and forget it. even as it invariably has been. you’ll piece CleanMem to try to to additional advanced things like ignore lists, only lists, and log files. These will be set by the CleanMem Settings program within the begin menu.
3-Memory Clean a pair of | macOS
Memory Clean is that the final app for optimizing your Mac’s memory and is best used once you’ve got finished employing a memory (RAM) intensive app or game. It replicates the sensation of a contemporary system restart. Memory Clean works by purging the Mac’s inactive memory Associate in Nursing is best used once you shut an intensive program that you just don’t arrange to use once more quickly at intervals some hours.
4-RAMRush | Windows
RAMRush may be a free memory management and improvement tool. It will with efficiency optimize memory usages of your Windows system, liberate physical RAM and build your system work higher. RAMRush uses Associate in Nursing intelligent thanks to manage the physical memory and lets the RAM add a stronger performance. it’ll assist you to forestall system crashes, memory leaks and keep your laptop running additional with efficiency.
Increase system performance
Increase the quantity of memory obtainable
Defragment system physical memory
Recover memory from Windows applications
Remove memory leaks
Prevent system crashes caused by heart issues
5-Wise Memory Optimizer | Windows
Most computer users have famed and unknown applications running within the background that take up your computer’s physical memory and thereby have an effect on its performance. Wise Memory Optimizer helps you liberate and tune up the physical memory concerned by some useless applications to spice up computer performance. the appliance needs a fairly low amount of C.P.U. and system memory, features a smart latency Associate in Nursing chop-chop finishes an improvement job. Better yet, it additionally features a moveable version. you’ll drop the program files anyplace on the drive or a flash drive and run it on any laptop while not previous install operations.
6-Mz RAM Booster | Windows
Mz RAM Booster may be a program created to enhance the performance of your laptop by auto-recovering RAM and fine standardization some Windows system settings! It uses nominal resources and virtually no C.P.U. time. Speed up your laptop, stop memory leaks and increase free RAM.
7-Memory Cleaner | macOS
Memory Cleaner will increase your free memory with an easy click and monitor memory usage within the menu bar. Memory Cleaner is that the good tool to stay your laptop going full speed and helps you to optimize your memory (RAM) usage with an easy click. Memory Cleaner keeps your systems memory (RAM) clean by observance and optimizing the memory usage. Helps you to quickly access elaborate memory info and identification from your menu bar and CLEAN your memory with an easy click. Main Features:
One-click and automatic system memory improvement
List of apps with important memory usage
Memory pressure meter and notifications
Dynamic and customizable menu bar
Detailed memory info
8-Memory Optimizer | Windows
Lacking memory? Optimize with Memory Optimizer. You’d be stunned what proportion you’ll recover! perceive your computer’s memory usage and keep it in check – Memory Optimizer can graph your computer’s memory showing you what’s exploitation it and supplying you with a straightforward thanks to optimize it’s usage. simply click “Optimize” and speed your laptop up immediately!
9-Mem Reduct | Windows
Lightweight period memory management application to watch and clean system memory on your laptop. The program used undocumented internal system options (Native API) to clear system cache (system operating set, operating set, standby page lists, changed page lists) with variable result ~10-50%. Application it’s compatible with Windows XP SP3 and better in operation systems, however some general options obtainable solely since Windows scene.
10-MemPlus | Windows
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MemPlus will be wont to monitor the RAM usage on your device. you’ll clear the memory of any non-essential processes by clicking the “Clear memory” button that is visible within the main window. this can clear each the operating sets of processes and also the FileSystem cache, if enabled. you furthermore might have the power to clear the operating set or FileSystem cache individually.
RAM Optimizer – MemPlus will be wont to cut back the quantity of RAM that’s being employed by applications on your system. In essence, liberating up memory so additional memory is offered to you!
RAM instrument – MemPlus will facilitate recover the specification of the RAM that’s put in on your system. This info will be exported in TEXT, HTML, CSV and surpass formats.
11-Iolo System Mechanic
Iolo System Mechanic removes junk files and unwanted apps, blocks bloatware and unwanted auto-run settings, clears out RAM and wipes various logs, browser histories and caches.
Its PC optimization toolkit really does make a difference; whenever we’ve tested System Mechanic we’ve found a significant speed improvement, especially at startup.
Not only does this free up key system resources, it also eliminates traces of your browsing activity to protect your privacy.
Conclusion :
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