Erasing your disk: For most reasons to erase, including when reformatting a disk or selling, giving away, or trading in your Mac, you should erase your entire disk.
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Nov 12, 2018 Re-install OS Sierra from the recovery menu. Note, attempting to directly restore the Time Machine backup to the empty formatted drive does not work (the restore operation succeeds but the OS will not boot). After re-installing OS Sierra, I was able to reboot into local recovery mode (command-R), no longer Internet Recovery. Time Machine and APFS Do Play Nice, Sorta. Apple has recently published a support article for system administrators regarding APFS and macOS High Sierra. The most important thing to know about. Here’s how to downgrade from APFS back to HFS+ / Mac OS Extended file system on your Mac such as a MacBook or an iMac. Apple’s HFS+ file system has been at the heart of the Mac for years, and was even used on iOS devices until very recently, too. Apple's newest file system, APFS, has some limitations and may not be a good fit for every user. If you want to revert your drives back to HFS+ from APFS, follow the steps in this tutorial.
Erasing a volume on your disk: In other cases, such as when your disk contains multiple volumes (or partitions) and you don't want to erase them all, you can erase specific volumes on the disk.
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.
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How to erase your disk
- Start up from macOS Recovery. Then select Disk Utility from the Utilities window and click Continue.
If you're not erasing the disk your Mac started up from, you don't need to start up from macOS Recovery: just open Disk Utility from the Utilities folder of your Applications folder. - Choose View > Show All Devices from the menu bar in Disk Utility. The sidebar now shows your disks (devices) and any containers and volumes within them. The disk your Mac started up from is at the top of the list. In this example, Apple SSD is the startup disk:
- Select the disk that you want to erase. Don't see your disk?
- Click Erase, then complete these items:
- Name: Type the name that you want the disk to have after you erase it.
- Format: Choose APFS or Mac OS Extended (Journaled). Disk Utility shows a compatible format by default.
- Scheme: Choose GUID Partition Map.
- Click Erase to begin erasing your disk and every container and volume within it. You might be asked to enter your Apple ID. Forgot your Apple ID?
- When done, quit Disk Utility.
- If you want your Mac to be able to start up from the disk you erased, reinstall macOS on the disk.
How to erase a volume on your disk
- Start up from macOS Recovery. Then select Disk Utility from the Utilities window and click Continue.
If you're not erasing the volume your Mac started up from, you don't need to start up from macOS Recovery: just open Disk Utility from the Utilities folder of your Applications folder. - In the sidebar of Disk Utility, select the volume that you want to erase. The volume your Mac started up from is named Macintosh HD, unless you changed its name. Don't see your volume?
- Click Erase, then complete these items:
- Name: Type the name that you want the volume to have after you erase it.
- Format: Choose APFS or Mac OS Extended (Journaled). Disk Utility shows a compatible format by default.
- If you see an Erase Volume Group button, the volume you selected is part of a volume group. In that case, you should erase the volume group. Otherwise, click Erase to erase just the selected volume. You might be asked to enter your Apple ID. Forgot your Apple ID?
- When done, quit Disk Utility.
- If you want your Mac to be able to start up from the volume you erased, reinstall macOS on that volume.
Reasons to erase
You can erase at any time, including in circumstances such as these:
- You want to permanently erase all content from your Mac and restore it to factory settings. This is one of the final steps before 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 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.
How to choose between APFS and Mac OS Extended
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 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, Disk Utility suggests APFS. Don't change it to Mac OS Extended. - Are you about to install macOS High Sierra or later for the first time 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. - Are you preparing a Time Machine backup disk or bootable installer?
Choose Mac OS Extended (Journaled) for any disk that you plan to use as a Time Machine backup disk or as a bootable installer. - Will you be using the disk with another Mac?
If the other Mac isn't using macOS High Sierra or later, choose Mac OS Extended (Journaled). Earlier versions of macOS don't work with APFS-formatted volumes.
How to identify the format currently in use
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 shown 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.
If your disk or volume doesn't appear, or the erase fails
- Shut down your Mac, then unplug all nonessential devices from your Mac.
- If you're erasing an external drive, make sure that it's connected directly to your Mac using a cable that you know is good. Then turn the drive off and back on.
- If your disk or volume still doesn't appear in Disk Utility, or Disk Utility reports that the erase process failed, your disk or Mac might need service. If you need help, please contact Apple Support.
Learn more
- If you can't start up from macOS Recovery, you can use a different startup disk instead.
- If Disk Utility shows a Security Options button in the Erase window, you can click that button to choose between a faster (but less secure) erase and a slower (but more secure) erase. Some older versions of Disk Utility offer the option to zero all data instead. These secure-erase options aren't offered or needed for solid-state drives (SSDs) and flash storage.
Jun 22, 2020 • Filed to: Solve Mac Problems • Proven solutions
Do you want to carry out a hard drive speed test for your Windows or Mac? You are probably wondering which hard drive speed tester is the best for your Mac or your Windows. Below is top selections software to test your hard drive speed. You can choose the best hard drive speed tester from the top 6 hard drive speed test software for Windows and the top 4 for Mac. If you meet problems of data lost due to hard drive, go looking at our solutions for Windows and Mac.
- Top 6 Hard Drive Speed Test Software for Windows
- Top 4 hard drive speed test software for Mac
Top 6 Hard Drive Speed Test Software for Windows
1. HD Tach
If you want to perform a hard drive speed test for your windows device, the HD Tach is here http://www.techspot.com/downloads/6714-hdtach.html
The main features of this hard drive tester include:
- It reads from all areas in the hard drive
- Provides an average speed report
- It logs read speeds to a text file for loading in a spreadsheet
- Performs sequential as well as random reads
- It also tests the burst speed of the drive
How to use HD Tach to test hard drive speed?
- Download the application and install it into your device
- Open the installation folder and then right-click on HD Tach
- On the Compatibility tab, select Windows XP ( Service Pack 3) and then click run this program as administrator
Run the application and click run test
When the test is complete, you will see the screen appearing in this manner
2. ATTO Disk Benchmark
Features of ATTO Disk hard speed tester includes:
- It can transfer sizes up to 64 MB and lengths up to 32 GB
- Supports overlapped I/O
- Its time mode provides room for continuous testing
- It supports a number of queue depths
You can get this app from http://www.softpedia.com/get/System/Benchmarks/ATTO-Disk-Benchmark.shtml
How to use ATTO Disk Benchmark to test hard drive speed on Windows?
- Download the hard drive speed tester install it
- Run the Benchmark.exe
- Select the drive and hit Start
- Wait for the test to complete then check the results
3. Anvil's Storage Utilities
Features of Anvil's hard drive speed test includes
- Performs complete read/write tests using random and sequential operations
- Provides a full set of results which include response time
- It comes with three IOPS tests
How to use Anvil's Storage Utilities to test hard drive speed?
- Download this hard drive speed tester and install it in your device. Simply go to http://as-ssd-benchmark.en.softonic.com/
- Unpack the app. It will detect and display the information related to the computer in its interface
- Check the settings to ensure that everything is configured correctly.
- Click start for the test to start.
4. RoadKil Speed test
Features of RoadKil hard drive speed test includes:
- Provides details on how fast your drive can transfer data
- Allows you to compare different drive speeds
How to use the software to test your hard drive speed?
The usage of this app is very straight forward.
- Download and install the app. To download, click http://www.roadkil.net/program.php?ProgramID=13
- Run the program and select the disk to be tested
- Hit begin test and wait for it to complete.
5. Parkdale
Features of Parkdale speed test for Windows hard drive includes:
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- Measures speeds of hard disks, network servers and Cd Rom devices
- Transfers are measured in kb/s or MB/s
- Available for both Mac and Windows
- Has 3 different modes; FileAccess, QuickAccess and BlockAccess
To use this Speed tester to test hard drive speed, follow these simple steps:
- Download the app
- Run the up, select the drive and choose one of the three modes that you would like to use in order to speed test the hard drive.
- Click start and let the process run
6. CrystalDiskMark
This is a freeware utility that is used to check hard disk performance.
Some of its features to test hard drive speed are:
- Runs both sequential and random read/write tests
- It can test any drive. This means you can perform an external hard drive speed test.
To download this app, go to http://crystalmark.info/software/CrystalDiskMark/index-e.html
Bootable os x 10.4.5 for intel pc. Steps on how to use CrystalDiskMark to perform hard drive speed test
- Download CrystalDiskMark and then install it
- Run the program
- Select the following setting in this step
- Number of runs 1
- Size to test 50 MB
- The disk you would like to check
- Click ALL to start the test.
Video Tutorial on Hard Disk Speed Test
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Part 2: Top 4 hard drive speed test software for Mac
1. BlackMagic Disk Speed Test
This is one of the best apps that you can use to perform hard drive speed test on Mac.
The features of the hard drive speed tester are:
- It has only one window
- Requires a few simple settings
- Compatible with OS X 10.10 Yosemite
- It shows write/read speeds in MB/second
Interested in this app? Well, go to http://www.macupdate.com/app/mac/38019/blackmagic-disk-speed-test to download the app for your Mac.
How to use BlackMagic Disk Speed Test to speed test hard drive on Mac?
- It is just one simple step. Click the Start button and the app will write test your drive.
- To access files use the File and Stress menu to choose the right hard drive to be tested.
2. NovaBench
This is another popular speed test app for Mac that you can use for hard drive speed test on your mac.
Features
- Comes with 3D graphic speed tests
- Tests the floating point arithmetic speed of CPU
- Tests write speed of the selected or primary hard drive
To download this app, go to https://novabench.com/download.php
Here are the steps about how to do a hard drive speed test by using NovaBench
- Download NovaBench app into your Mac
- Start up the Program
- Close all other applications before you run the speed test.
- Run the Speed test process. Go to Tests>> Run All Tests
- When it is completed, you will receive something like this:
3. Parkdale
The features of this hard disk speed tester include:
- Transfers are measured in kb/s or MB/s
- Measures speeds of hard disks, network servers and Cd Rom devices
- Has 3 different modes; FileAccess, QuickAccess and BlockAccess
- It is available for both Mac and Windows
To use this Speed tester, follow these simple steps:
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- Download the app from http://run.to/sz
- Run the up, select the drive, and choose one of the three modes that you would like to use in order to speed test the hard drive.
- Click start and let the process run
4. Geekbench
This is a hard disk speed test tool which has the following features;
- Benchmark: Measures Speed and performance
- It measures how your computer manages tasks and applications.
- It determines the stability of the computer system.
- It supports Mac, Windows, Linux, iOS and Android.
Hard drive speed test using Geekbench
Just follow these simple steps to perform hard drive read-write speed test using Geekbench. It can also do an external hard drive speed test.
- Download Geekbench into your device. You can get it from http://www.primatelabs.com/geekbench/
- Switch all the applications on your computer to get maximum results.
- Launch the Geekbench application
- Click on Run benchmarks. If you are using a free trial version then you will be limited to 32-bit mode. If you purchase it then you can use 64-bit mode.
- Once the progress is complete you will see your results as in the figure below.
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