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By default, Mac starts from its built-in hard disk, but a startup disk can be any storage device that contains bootable contents that compatible with your Mac. For example, if you install macOS or Microsoft Windows on a USB drive, your Mac can recognize that drive as a startup disk. This guide provides 2 ways to boot a Mac from a USB flash drive.
Hovsep, I originally read that link you provided before I was having the issues. I solved the problem yesterday. I changed the Windows partition on the external HD to MS-DOS, ejected the HD, rebooted into Windows 7, plugged in the HD, Windows saw HD right away, went into Disk Management and changed the Windows partition from MS-DOS to NTSF. Corrupt data can be one reason your Mac won't recognize an external drive, but there are other reasons too. Let's take a look why this is happening and how you can get an external drive to appear on your Mac and get recover data to access to your documents. Hello, I recently bought a new internal hard disk to my MacBook. I followed the instructions in the site MacBook Pro 13' Unibody Mid 2012 Hard Drive Replacement and managed to replace the hard disk correctly but the MacBook does not recognize it. When I turn on the MacBook with a new hard disk is showing a sign of a folder and a question mark, when I turn on the MacBook with the old hard disk.
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So it reads the hard drive on rare occasions. I purchased a new hard drive and installed it, won't read it. I put the hard drive in another computer and it works fine. So I formatted it for mac and tried it again, still won't show up. What is going on with this dumb thing? I don't have apple care and the nearest 'genius' bar is 8 hours away.
Starting up your Mac from an external disk requires the following:
- Intel-based Mac.
- Bootable USB thumb drive formatted with a GUID partition type and containing an OS X installer or a usable operating system.
Let's see how to boot a Mac from a bootable USB drive and what to do if your Mac doesn't start up from it.
Way 1: Boot Mac from USB Drive using Startup Manager
Getting your Mac to load from a USB drive is fairly straightforward. Use the following steps, you can easily set Mac boot from an external drive in Startup Manager, so it'll only boot from USB that one time.
Step 1: Insert the USB boot media into a USB slot.
Step 2: Turn on your Mac (or Restart your Mac if it's already on).
Step 3: Press and hold the Option key immediately after you see the Apple logo. Holding that key gives you access to OS X's Startup Manager. Once the Startup Manager screen appears, release the Option key. The utility will look for any available drives that include bootable content.
Step 4: Using either the pointer or arrow keys on the keyboard, select the USB drive you wish to boot from. Once selected, either hit the Return key or double-click your selection. The machine will start to boot from the USB drive.
Way 2: Set a Mac Boot from USB Drive using Startup Disk
When you use Startup Disk preferences to set Mac boot from an external drive, so it'll boot from that disk until you choose a different one. Here is how:
Step 1: Go to Apple menu > System Preference, then click Startup Disk. Macbook not detecting external hard drive.
Hard Drives For Macbook Pro
Step 2: Click the locked icon and then enter your administrator password.
Apple wired keyboard qwerty. Step 3: Select External drive as the startup disk, then restart your Mac.
What to do if your Mac does not boot from the selected drive
If you see a message prompts that your security settings do not allow this Mac to use an external startup disk, check the External Boot setting in Startup Security Utility, and then allow your Mac to use an external startup disk.
Step 1: Open Startup Security Utility.
Turn on your Mac, then press and hold Command (⌘) + R immediately after you see the Apple logo. Your Mac starts up from macOS Recovery. When you see the macOS utility window, choose Utilities > Startup Security Utility from the menu bar. When you're asked to authenticate, click Enter macOS Password, then choose an administrator account and enter its password.
Step 2: Select 'Allow booting from external media'.
If you want to select an external startup disk before restarting your Mac, quit Startup Security Utility, then choose Apple menu > Startup Disk.
Note: If you're using Boot Camp in a dual-boot Windows/OS X environment, you may be unable to boot negatively into supported versions of Microsoft Windows XP, Windows Vista or Windows 10 operating systems installed on external USB hard drive.
Make sure disk has been formatted with a GUID partition type
Intel-based Macs support starting from an external USB storage device's volume that has been formatted with a GUID partition type. If you wish to boot from the drive, it's important to format the partition as 'GUID Partition Table' rather than either of the other two ahead of time when you use that drive as a bootable drive.
Make sure your disk is bootable
Volumes that aren't bootable and don't contain a copy of a valid operating system aren't listed in Startup Disk or Startup Manager. Make sure the external drive you're trying to start from contains a usable operating system.
Oct 26, 2020 • Filed to: Answer Hard Drive Problems • Proven solutions
While the external hard drive connected to the Windows computer or Mac, and the device did not show up. How to fix external hard drive not recognized? Don't worry, in this guide we will show you the best solution to fix the hard drive not recognized problem.
This problem will cause by some partition issues: the external hard drive partition got damaged, the file system got crashed, the drive errors in Windows computer, or the dead USB ports. You can try the hard drive on another computer or connect it with other USB ports. If it does not get working, you can follow the next solution to fix the external hard drive not recognized on Windows computer and Mac, and you can recover lost data from external hard drive with Recoverit Data Recovery.
Part 1. How to Fix External Hard Drive Not Recognized on Windows
In windows, this problem can be because of partition issues, dead USB ports, driver windows conflicts, file systems, dead or outdated drivers. Here are the steps you can follow to fix this issue in case of USB flash or external hard drives:
Step 1You might be plugging in the USB cable in a dead USB port. Unplug your external hard drive and plugin it in some other USB ports. Now, see if it is present there in the My Computer window. If not, follow step 2.
Step 2Now, look for the external drive in the Disk Management Window. For this, click Start and then click Run or press windows key + r, press enter after typing diskmgmt.msc in the Run dialog. This will open the Disk Management Window. Now, look for the external disk in this window. In this window, you can find your drive even if it is not recognized because of no partition. If you cannot find the drive in the Disk Management window then you can go for step four.
Step 3If it is not recognized by plugging in some other port or it is not visible in the Disk Management Window, then there might be some issue with the external drive. Check it on some other computers. Now, follow step 1 to step 3 in that computer in case the external drive is not recognized. If the problem exists with another computer also then something is wrong with the drive, otherwise follow step 5:
Step 4If it is working in some other systems but not in yours, Windows is having some problem with the drivers. To diagnose a driver problem, open the run dialog by pressing Windows + r and type 'devmgmt.msc'? Now press enter. Expand Disk Drives and look for a device having a yellow exclamation mark. This yellow exclamation mark indicates a problematic driver. Now, right-click on that device and read the error message after selecting properties. This issue can resolve in the following two ways:
- Click on the update driver button for installing updated drivers.
- Uninstall the driver and restart your computer. After restarting, the Windows will automatically reinstall and reconfigure the driver.
Now, plug in the external drive again or follow step 6 if the drive is still not recognized.
Step 5Problem in partitioning and formatting can also be a cause of this issue. Partitioning and file system issues can be fixed by using Windows Disk Management tools. To create a new partition, right-click inside the unallocated space and select New Simple Volume. You can create a new partition by following onscreen instructions. Sometimes, your drive is formatted with the ext4 file system of Linux, NTFS file system, HFS Plus file system, or FAT32 file system which is not recognized by your Windows. Reformatting of the drive can resolve this issue. For this, right-click on the partition, select format, and then select the file system. Here, it is important to know that all files in the drive will be deleted. Therefore, copy your files in some other systems before proceeding.
Video Tutorial on How to Fix External Hard Drive Not Showing Up
Part 2. How to Fix External Hard Drive Not Recognized on Mac
Like Windows, Mac also detects an external drive automatically. If it doesn't, follow these steps:
Step 1 First of all, look for the external hard drive in the finder window. For this, click on File and then click New Finder Window. Now, look for the drive below the remote disk.
Step 2 Apple iphone app store download. If the external drive is not there, make sure that the USB cable is properly plugged in the external hard drive and the port.
Step 3 Sometimes, the drive is connected but not mounted. To mount a drive, open Disk Utility and look for the drive in the list. If it is there, check below it. Now click on the mounting button to mount it. Open a Finder window to see if the drive is mounted or not.
Step 4 If you still cannot find it in the finder, it might not be getting enough power. Single USB ports can provide only 5 V. In that case, make use of USB cable having one USB connection for the external HD and two for Mac. This will supply the power required by the external hard drive.
These steps for fixing an external hard drive not recognized on Windows and Mac are suitable for external hard drives of all capacities and manufacturers. However, if still the issue is not resolved, you can avail of professional help.
If you want to select an external startup disk before restarting your Mac, quit Startup Security Utility, then choose Apple menu > Startup Disk.
Note: If you're using Boot Camp in a dual-boot Windows/OS X environment, you may be unable to boot negatively into supported versions of Microsoft Windows XP, Windows Vista or Windows 10 operating systems installed on external USB hard drive.
Make sure disk has been formatted with a GUID partition type
Intel-based Macs support starting from an external USB storage device's volume that has been formatted with a GUID partition type. If you wish to boot from the drive, it's important to format the partition as 'GUID Partition Table' rather than either of the other two ahead of time when you use that drive as a bootable drive.
Make sure your disk is bootable
Volumes that aren't bootable and don't contain a copy of a valid operating system aren't listed in Startup Disk or Startup Manager. Make sure the external drive you're trying to start from contains a usable operating system.
Oct 26, 2020 • Filed to: Answer Hard Drive Problems • Proven solutions
While the external hard drive connected to the Windows computer or Mac, and the device did not show up. How to fix external hard drive not recognized? Don't worry, in this guide we will show you the best solution to fix the hard drive not recognized problem.
This problem will cause by some partition issues: the external hard drive partition got damaged, the file system got crashed, the drive errors in Windows computer, or the dead USB ports. You can try the hard drive on another computer or connect it with other USB ports. If it does not get working, you can follow the next solution to fix the external hard drive not recognized on Windows computer and Mac, and you can recover lost data from external hard drive with Recoverit Data Recovery.
Part 1. How to Fix External Hard Drive Not Recognized on Windows
In windows, this problem can be because of partition issues, dead USB ports, driver windows conflicts, file systems, dead or outdated drivers. Here are the steps you can follow to fix this issue in case of USB flash or external hard drives:
Step 1You might be plugging in the USB cable in a dead USB port. Unplug your external hard drive and plugin it in some other USB ports. Now, see if it is present there in the My Computer window. If not, follow step 2.
Step 2Now, look for the external drive in the Disk Management Window. For this, click Start and then click Run or press windows key + r, press enter after typing diskmgmt.msc in the Run dialog. This will open the Disk Management Window. Now, look for the external disk in this window. In this window, you can find your drive even if it is not recognized because of no partition. If you cannot find the drive in the Disk Management window then you can go for step four.
Step 3If it is not recognized by plugging in some other port or it is not visible in the Disk Management Window, then there might be some issue with the external drive. Check it on some other computers. Now, follow step 1 to step 3 in that computer in case the external drive is not recognized. If the problem exists with another computer also then something is wrong with the drive, otherwise follow step 5:
Step 4If it is working in some other systems but not in yours, Windows is having some problem with the drivers. To diagnose a driver problem, open the run dialog by pressing Windows + r and type 'devmgmt.msc'? Now press enter. Expand Disk Drives and look for a device having a yellow exclamation mark. This yellow exclamation mark indicates a problematic driver. Now, right-click on that device and read the error message after selecting properties. This issue can resolve in the following two ways:
- Click on the update driver button for installing updated drivers.
- Uninstall the driver and restart your computer. After restarting, the Windows will automatically reinstall and reconfigure the driver.
Now, plug in the external drive again or follow step 6 if the drive is still not recognized.
Step 5Problem in partitioning and formatting can also be a cause of this issue. Partitioning and file system issues can be fixed by using Windows Disk Management tools. To create a new partition, right-click inside the unallocated space and select New Simple Volume. You can create a new partition by following onscreen instructions. Sometimes, your drive is formatted with the ext4 file system of Linux, NTFS file system, HFS Plus file system, or FAT32 file system which is not recognized by your Windows. Reformatting of the drive can resolve this issue. For this, right-click on the partition, select format, and then select the file system. Here, it is important to know that all files in the drive will be deleted. Therefore, copy your files in some other systems before proceeding.
Video Tutorial on How to Fix External Hard Drive Not Showing Up
Part 2. How to Fix External Hard Drive Not Recognized on Mac
Like Windows, Mac also detects an external drive automatically. If it doesn't, follow these steps:
Step 1 First of all, look for the external hard drive in the finder window. For this, click on File and then click New Finder Window. Now, look for the drive below the remote disk.
Step 2 Apple iphone app store download. If the external drive is not there, make sure that the USB cable is properly plugged in the external hard drive and the port.
Step 3 Sometimes, the drive is connected but not mounted. To mount a drive, open Disk Utility and look for the drive in the list. If it is there, check below it. Now click on the mounting button to mount it. Open a Finder window to see if the drive is mounted or not.
Step 4 If you still cannot find it in the finder, it might not be getting enough power. Single USB ports can provide only 5 V. In that case, make use of USB cable having one USB connection for the external HD and two for Mac. This will supply the power required by the external hard drive.
These steps for fixing an external hard drive not recognized on Windows and Mac are suitable for external hard drives of all capacities and manufacturers. However, if still the issue is not resolved, you can avail of professional help.
Part 3. The Best External Hard Drive Data Recovery Software
While the external hard drive got damaged and did not detect on the computer, after you fix the problem, you should your data back. We will introduce the best external hard drive data recovery to help you retrieve data back. Recoverit Data Recovery Software is a powerful data recovery program, it can help you recover data from external hard drives easily and effectively.
Recoverit External Hard Drive Recovery Software
Recoverit Data Recovery is the best external hard drive recovery program, it can easily and effectively help you recover lost or accidentally deleted files from the hard disk drive, or another external storage device: USB drive, flash drive, SD card.
Steps on How to Recover Data from External Hard Drive
Download and install Recoverit Data Recovery on your computer. Launch Recoverit Data Recovery and follow the next steps to perform external hard drive data recovery on a Windows computer, if you are a Mac user, you can download Recoverit Data Recovery for Mac to go on.
Step 1. Connect your external hard drive to the computer, select it while the disk detected on the program.
Step 2. The external hard drive recovery software will start scanning the device to searching the lost files.
Step 3. In minutes� all recovered files will display on the result. You can preview photos, videos, music, Word, Excel, PPT, and PDF. Select your files and click the 'Recover' button to restore.
When the external hard drive got damaged, you can try to fix it with the solution mentioned above. Also, get your data back with Recoverit Data Recovery in simple steps. Download and try it for now.
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