You set your Mac or Macbook which disk to start up from when more than one startup disk is connected. This works for USB drives including the NinjaStik For 2018 to 2020 Macs with the Secure Boot T2 Chip, see the 2020 Macbook Pro Boot from USB instructions. A “startup disk” is a volume or partition of a drive that contains a bootable operating system. Startup 9.2.1 repairs problems that may occur when Mac OS 9.1 and Mac OS X are on the same partition and a version earlier than Startup 9.2 has been used.
Sep 06, 2019 Or use the OS X installation disc that came with your machine — or buy a new one — to boot up and install OS X on your Mac’s hard drive. Related: How to downgrade from macOS Mojave to macOS High Sierra; Factory reset MacBook Air and other Macs with macOS; How to create a macOS Catalina USB installer; macOS could not be installed, how-to fix.
The internal hard drive of your Mac, also known as Macintosh HD or startup disk, is used to store operating system directory and other data, supporting computer to work in a normal manner. It could be SSD, yet the internal hard drive may not show up on the Mac, Finder or Disk Utility, stoping you from accessing your data or booting your Mac up.
Fortunately, there are some means to fix the internal hard drive not showing up issue. Basically, it depends on if you can boot the Mac when internal hard drive is not showing up.
Case 1: The internal hard drive is not showing up but Mac boots up
If you can't see the internal hard drive but you can start and use your Mac normally, the good news is that your macOS volume (which usually is the Macintosh HD) is working fine. To access other files on the internal hard drive normally, you can try the following solutions.
Solution 1: Change the Mac's settings to show the internal hard drive
If your Mac computer works in a normal state but the internal hard drive is not showing up in Finder or on desktop. This is because the system is not set up to display hard drives in Finder or on desktop. Here are some simple fixes for this:
1. Go to Finder > Preferences > General tab and select 'Hard disks' to make internal hard drives show on the desktop.
2. Go to Finder > Preferences > Sidebar tab and select 'Hard disks'. Then your internal hard drive should be showing up in the Finder.
Instead, if the Mac doesn't display your external hard drive, you can check 'External disk' in this tab also to make it visible.
3. If the 'Hard disks' option is ticked but internal hard drive is not showing up in the Finder still, open the Finder, put your mouse at Locations in the left sidebar and see if it displays 'Show' or 'Hide'. Click and change to identify if your internal hard drive is hidden by the Finder.
Solution 2: Check whether the internal hard drive is showing up in Disk Utility
The internal hard drive still not showing up/mounting on Mac? Well, you really need to check it in Disk Utility. You can make use of Disk Utility to perform any disk volume-related tasks. Normally, if the hard disk or SSD is listed in the left sidebar of Disk Utility, you can leave out the hardware problems.
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If you find the internal hard drive showing up in Disk Utility but some partitions or APFS volumes of the hard drive are lost, the drive may have some file system corruptions. Hopefully, we can provide several clues to help you isolate and troubleshoot most logical disk errors.
1. Mount the internal hard drive on Mac
Sometimes, aninternal hard drive won't mount on Mac, it's time to force it to mount. Simply go to Disk Utility > choose the unmounted internal hard drive > Mount.
2. Run First Aid to repair the internal hard drive
If the internal hard drive is still not mounting on Mac, you can run First Aid to verify and repair various issues like partition table lost and file system corruption. You can go to Disk Utility > choose the greyed out partitions under internal hard drive > click First Aid > choose Run.
Data recovery from corrupted internal hard drive
If unfortunately,Disk Utility can't repair the disk, the corruptions on the internal hard drive are so serious. In this situation, all data on the drive is so fragile that any operation will overwrite it. To prevent further data loss, especially when you have no backup of the data, it's better to immediately recover lost data from the internal hard drive with reliable Mac data recovery software like iBoysoft Data Recovery for Mac.
Case 2: Internal hard drive is not showing up and you can't boot up the Mac
When you can't access the internal hard drive because the Mac is not booting up, you can try these solutions.
Solution 1: Repair the internal hard drive in macOS Recovery Mode
When your Mac won't boot as there is no statup disk, you can try to check if you can find the internal hard drive in macOS Recovery Mode by the following steps.
Step 1: Boot your Mac into macOS Recovery mode. Start your Mac and hold down the Command +R + Option keys simultaneously until you see an Apple logo or spinning globe. Then release the keys.
Step 2: Select Disk Utility from the macOS Utilities menu.
Step 3: Select the corrupted internal hard drive from the left-hand panel if you can see it.
Step 4: Click First Aid on the top and wait while it verifying and repairing errors.
Solution 2: Check the internal hard drive that won't show up in Terminal
If the internal hard drive disappeared from your iMac or Mac mini, you can check the internal hard drive in Terminal, especially for a internal Fusion drive. The reason is that when an internal Fusion drive is split, you can't see it showing up on Mac normally. Instead, it would be split into an extra SSD and a hard drive, making the internal fusion hard drive invisible. Brother dcp 7020 driver mac os x.
If you can see them with correct storage capacity by the command line 'diskutil list', you need to recover lost data from the internal hard drive with iBoysoft Data Recovery for Mac to avoid data loss and then fix a split fusion drive as soon as possible.
But if you can't see the fusion hard drive with right disk information, you'd better call 1-800-275-2273(US) or contact Apple for support.
How to recover lost data when the internal hard drive is not showing up on Mac?
When your internal hard drive is not showing up in Terminal or in Disk Utility under Recovery Mode, then your hard drive should have some serious corruption. In this case, the data on the unbootable Mac is a great concern for you for sure. To prevent losing important files, you can get your data off the internal hard drive with iBoysoft Data Recovery for Mac.
iBoysoft Data Recovery for Mac is free Mac hard drive data recovery software that helps you recover documents, pictures, audios, videos, emails from internal and external hard drives. It can recover lost data when the hard drive is not showing up, not recognized, not mounted, not readable. What's more, this program can also recover lost data from formatted or corrupted Macintosh HD external hard drives, USB flash drives, SD cards, etc. Even when your Mac is not booting up, the program can regain access to your machine without taking out the internal hard drive.
It is compatible with macOS 10.15/10.14/10.13/10.12 and Mac OS X 10.11/10.10/10.9/10.8/10.7.
How to recover lost data from internal hard drive when Mac can access the Internet?
If you have only one Mac computer, please directlyrun iBoysoft Data Recovery for Mac in macOS Recovery mode and recover lost data from the unbootable Mac computer. This solution is highly recommended because it is easier and more effective.
Note: Before you follow the steps below, you have to make sure your Mac has Internet connection.
1. Reboot this Mac and press Command +Option +R keys.
2. Choose a network for your Mac. You need to make your Mac connected to the Internet all the time.
3. Click Utilities in the top menu and select Terminal from the drop-down menu.
4. Run the following command:
This will launch iBoysoft Data Recovery for Mac through iBoysoft Server.
5. Select the internal hard drive and recover lost data with iBoysoft Data Recovery for Mac with its wizard.
How to recover lost data from internal hard drive when Mac can't access the Internet?
If the unbootable Mac is unable to be connected with the Internet or WiFi, additionally, you need to find another workable Mac to help you recover lost data.
Step 1: Download iBoysoft Data Recovery for Mac on another Mac computer.
Step 2: Install and launch iBoysoft Data Recovery for Mac on the healthy Mac computer.
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Step 3: Click iBoysoft Data Recovery on the menu bar and then select 'Create Boot Drive'.
Step 4: Insert a USB drive into the healthy Mac computer.
Step 5: Follow the wizard to create a bootable recovery drive on the USB drive.
Step 6: When the creation process completes, you can insert the USB drive into the unbootable Mac computer, and then press the Power button and Option key (⌥) to start the Mac up.
Step 7: Select iBoysoft Data Recovery for Mac from the boot options.
Note: If you're running macOS Mojave or earlier, iBoysoft Data Recovery for Mac will launch immediately when your Mac boots up. But, if your Mac is running macOS Catalina, you need two additional steps to launch this program.
Step 8: Wait for your Mac to boot up, open 'Terminal' application from 'Utilities' drop-down menu.
Step 9: Run the following command:
Now you can recover lost data from the corrupted internal hard drive.
Erase the internal hard drive and reinstall macOS
External Hard Drive Not Detected
After retrieving data from the corrupted internal hard drive, you can reformat the internal hard disk to make it usable again.
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Step 1: Boot your Mac to macOS Recovery mode.
Step 2: Select Disk Utility from the macOS Utilities menu.
Step 3: Select the corrupted internal hard drive from the sidebar.
Step 4: Click on Erase from the top.
Step 5: Setup the required information to reformat the disk and click Done when finished.
Step 6: Go back to macOS Utilities screen and select Reinstall macOS.
But if your internal hard drive is not showing up in Disk Utility, the drive may have hardware problems. In this case, none of software is helpful. But you can try to boot up your Mac in Safe Boot or reset the PRAM / NVRAM, and then see if the internal hard drive is showing up on your Mac.
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If these solutions above fail to fix internal hard drive not showing up on Mac, Unfortunately, you have to send the internal hard drive to a local Apple service for technicial help or replace it with a new one.
Start up from macOS Recovery
Download and install Recoverit hard drive recovery software on your computer, follow the next steps to get your data back. Select the corrupted disk To recover hard disk files, you can start Recoverit Data Recovery on your computer. Download software in the Boot Manager/Disk category. Create bootable USB from dozens of ISO files containing different versions of operating systems an.
Determine whether you're using a Mac with Apple silicon, then follow the appropriate steps:
- Apple silicon: Turn on your Mac and continue to press and hold the power button until you see the startup options window, which includes a gear icon labeled Options. Select Options, then click Continue.
- Intel processor: Make sure that your Mac has a connection to the internet. Then turn on your Mac and immediately press and hold Command (⌘)-R until you see an Apple logo or other image.
If you're asked to select a user you know the password for, select the user, click Next, then enter their administrator password.
Reinstall macOS
Select Reinstall macOS from the utilities window in macOS Recovery, then click Continue and follow the installer's instructions.
Follow these guidelines during installation:
- Allow installation to complete without putting your Mac to sleep or closing its lid. Your Mac might restart and show a progress bar several times, and the screen might be empty for minutes at a time.
- If the installer asks to unlock your disk, enter the password you use to log in to your Mac.
- If the installer doesn't see your disk, or it says that it can't install on your computer or volume, you might need to erase your disk first.
- If the installer is for a different version of macOS than you expected, learn about other installation options, below.
- If the installer offers you the choice between installing on Macintosh HD or Macintosh HD - Data, choose Macintosh HD.
After installation is complete, your Mac might restart to a setup assistant. If you're selling, trading in, or giving away your Mac, press Command-Q to quit the assistant without completing setup. Then click Shut Down. When the new owner starts up the Mac, they can use their own information to complete setup.
Other macOS installation options
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By default, macOS Recovery installs the latest macOS that was previously installed on your Mac.* You can get other macOS versions using one of these methods:
- On an Intel-based Mac, you can use Option-Command-R at startup to upgrade to the latest macOS that is compatible with your Mac. Exceptions:
- If macOS Sierra 10.12.4 or later was never previously installed, you will receive the macOS that came with your Mac, or the closest version still available.
- If your Mac has the Apple T2 Security Chip and you never installed a macOS update, you will receive the latest macOS that was installed on your Mac.
- On an Intel-based Mac that previously used macOS Sierra 10.12.4 or later, you can use Shift-Option-Command-R at startup to install the macOS that came with your Mac, or the closest version still available.
- Reinstall macOS from the App Store instead of using macOS Recovery. If you can't install the latest macOS, you might be able to install an earlier macOS.
- Create a bootable installer, then use it to install macOS on your Mac or another Mac.
* If you just had your Mac logic board replaced during a repair, macOS Recovery might offer only the latest macOS compatible with your Mac. If you erased your entire disk instead of just the startup volume on that disk, macOS Recovery might offer only the macOS that came with your Mac, or the closest version still available.
Summary : This blog helps you repair the startup disk on MacBook, iMac, Mac mini or Mac Pro.
To make your macOS Mojave 10.14 perform smoothly forever; you should perform the simple task of repairing the macOS Mojave start-up disk drive with the help of the Disk Utility application. macOS Mojave’s boot volume which is also known as the Macintosh HD will be APFS formatted. Like any other file-system; the APFS has its directory structure and the partition map. Though the former can be repaired with the Disk Utility application, the latter is impossible to fix.
Disk Utility is the free and native application that performs multiple tasks on your storage device. The utility verifies and repairs the corruption. It can re-partition your SSD or the HDD into more than a single partition. Further, the Disk Utility allows you to erase and secure erase your macOS Mojave volumes.
How to Verify & Repair macOS Mojave?
Follow the sequential steps to verify and repair macOS Mojave start-up disk drive:
- Start your macOS Mojave and launch Disk Utility from the Utilities folder
- Locate your internal SSD (or HDD) in the Disk Utility left-corner
- Figure out at what level of the storage volume you want the utility to repair? Else, you can repair all of them one-by-one. For instance: In APFS, you have the Apple HDD, Container disk# and the macOS.
- Select the Apple HDD and press First-Aid. A message saying ‘Would you like to run First Aid on Apple HDD_’ will pop-up. Proceed by clicking on the Run.
- Disk utility will perform verification and repair of the chosen storage drive. A message saying ‘Running First Aid on Apple HDD’ will pop-up. Let the process of First Aid end successfully.
Note: A message ‘The partition map appears to be Ok. Operation Successful.’ will appear.
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- Press Done and repeat the process on the start-up disk, container, and the storage volume.
Steps to Repair Container on Mojave
- Select Container and Click First Aid. A pop-up will appear ‘First Aid needs to temporarily lock the boot volume’. Press continue to start the repair process.
- Disk utility will soon end the repair process.
Result: Operation Successful
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Steps to Repair macOS Volume on Mojave
- Select macOS Volume and Press First Aid. A pop-up will appear ‘First Aid needs to temporarily lock the boot volume’. Press continue to start the repair process.
- Click Done when finished.
Result – Volume appears to be OK. Operation Successful
Similarly, the Disk Utility application can repair HFS, HFS+ volumes, external hard drive partitions, SSDs, USB flash drives in a similar manner.
Helpful Links:
- Also, Read How to Recover Data from macOS Mojave Start-up Disk?
- Download, Stellar Data Recovery DMG to run Mac data recovery free trial.