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Posted by Katrina to Mac Data Recovery on October 29th, 2018
After upgrading from OS X Sierra to OS X High Sierra on my MacBook Air, I can no longer mount and read my external hard drive. During the upgrade, I converted my MacBook hard drive to APFS. My external drive is formatted as Mac OS Extended.
Is the data on my external drive inaccessible now that I have APFS on my computer? Or is there a way to access it?
When you connect your external hard drive on Mac, if everything is working fine, the operating system will automatically recognize the device and mount its data in the Finder application. However, just like the above example, it may happen that the external hard drive is invisible on the left side menu of Finder and unmounted when checking in Disk Utility. Can't mount an external hard drive on Mac? This post will show you feasible solutions.
Mounting issues on Mac
There are numerous reasons forexternal drive not mounting issue, and below listed are few common ones:
Unable to mount external hard drive on Mac, how to fix?
The following are three effective solutions to external hard drives won't mount on Mac. But before running these steps, please do some basic checks.
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Quick fixes of external hard drive not mounting on Mac:
1. Convert adobe files to excel. Check whether the disk is properly connected to the system and powered on if required.
2. Try a different USB cable to make sure it is not at fault.
3. Try a different port/hub or plug another device in to see if the port/hub works. If you are sure that there is no problem with the USB port/hub, you can plug a working external drive in a port/on a hub, unmount and eject it. Then plug the unmountable external hard drive into that port/hub.
4. Check the file system of the external hard drive. Mac cursor for windows. Sometimes when the drive is formatted with NTFS, it can't be mounted on Mac. By default, macOS only enables NTFS drive read support but disables write support. In this case, you can mount external hard drive with the help offree NTFS driver for macOS.
Still unable to mount the external hard drive on Mac? There might be problems with the drive itself, but you still have ways to resolve it.
Back up at first
Since you can't access the external hard drive, all files stored on the drive are lost. In this situation, if you have important files on the external hard drive, any operation on the drive will overwrite the original data, resulting in irreparable data loss. So it's highly recommended to make a backup firstly. Forget to back up before?iBoysoft Mac Data Recovery can help yourecover lost data from the unmountable external hard drive.
iBoysoft Mac Data Recovery is afree external hard drive data recovery tool that enables you to recover data from external drive which is unmounted, formatted, inaccessible, unreadable, or corrupted. It's fully compatible with macOS Catalina 10.15/Mojave 10.14/High Sierra 10.13/10.12 and Mac OS X 10.11/10.10/10.9/10.8/10.7. It supports data recovery from hard drive, external hard drive, USB flash drive, SD card, memory card, pen drive, etc.
Tutorial to recover data from unmountable external drive on Mac with iBoysoft Mac Data Recovery
Step 1: Download and install iBoysoft Mac Data Recovery on Mac.
Step 2: Launch iBoysoft Mac Data Recovery.
Step 3: Select the unmountable external drive drive and click 'Next' button to scan all lost data.
Step 4: Preview the searching results, choose files we need, and click 'Recover' to get them back.
Step 5: Have a check to ensure we have got all lost data back.
Solution 1: Repair the external hard drive with Disk Utility
Step 1: Launch Disk Utility. Where can i download rumble fighter for mac.
Step 2: Choose the unmountable external drive on the left sidebar.
Step 3: Select First Aid in the top center and click Run. Pocket for mac.
Solution 2: Repair the external hard drive with Terminal
Sometimes, Disk Utility may not function as desired. But you can still repair the corrupted external hard drive with Terminal.
Step 1: Go to Applications > Terminal
Step 2: Enter: diskutil list (This will list out the available volumes).
Step 3: Check the volume identifier from the table that appears.
Step 4: Enter:diskutil repairVolume [diskvolume identifier]. For example, if the volume identifier of external hard drive is disk2s, you should enterdiskutil repairVolume disk2s.
Solution 3: Reformat the external hard drive
If yourexternal hard drive can't be repaired with Disk Utility and Terminal, the drive might be seriously corrupted. The only way is to reformat it. Reformatting will erase all data on the external hard drive, please make sure you have backed up important data.
1. Launch Disk Utility from Utilities.
2. Click the icon of the unmountable external drive on the left part of the window.
3. Click the Erase function on the top of the Disk Utility window.
4. Complete the related information (name, format, scheme), then click Erase button.
Still have questions?
Most of the time, when you connect an external hard drive to your Mac’s USB port, you soon see it mount on the desktop. Apple likes to ensure these are easy to find, so they also appear in the Finder in the left-hand column under Devices, since Mac’s treat them the same way as another computer. Modern.ie mac os x.
However, sometimes, an external hard drive doesn't show up. It’s annoying, especially when you need to transfer something right then. And besides, there can be a risk that data on the external USB pen, hard, or flash drive is corrupt, which means you can’t transfer what you need between devices at all.
Open an External Drive Not Showing on Mac
Get a huge set of top utilities for troubleshooting external hard drives not mounting on a Mac
Quicken for mac 2017. 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.
How to fix an external disk drive that won't show up on a Mac
Why an external disk drive is not showing up? There could be a few reasons why a USB flash drive isn’t making an appearance.
Start with the basics:
Unfortunately, if none of those options has worked and the external drive still isn’t visible, then it could have crashed, or be well and truly broken. But there might still be a way you can recover the data on the external drive.
External Hard Drive For MacHow to show connected devices in Finder
In the Sidebar tab you can choose which folders and devices will be shown in the left-hand column of the Finder window.
How to add cloud storages to Finder
You can also mount cloud storage as local drive on your Mac. By connecting Google Drive, Dropbox, or Amazon to your computer, you get more space for securely accessing and sharing files. For your ease, add cloud drives to Finder with CloudMounter app, so that you keep them close at hand. You can read detailed instructions on managing cloud storage as local drives here.
Repair the failed external drives with First Aid
If your drive is having problems, you can try to fix them yourself with First Aid and therefore get access to your files. First Aid tool will check the disk for errors and then attempt a repair as needed. It helps to verify and repair a range of issues related to startup HD and external drive problems. If you are able to fix the hard drive or SSD in your Mac (or an external drive) using Disk Utility you will hopefully be able to recover your files.
To run Fist Aid on an external hard drive:
If First Aid successful in fixing errors, the external drive should be available to mount. If the utility unable to repair issues, your drive truly is broken or formatted using a file system that the Mac cannot read - in this way we suggest you follow the next steps to recover data from a damaged disk drive.
How to recover data from a crashed drive
Thankfully, there is an app for that. Disk Drill is the world’s premier data recovery software for Mac OS X. Powerful enough to retrieve long-lost, mistakenly deleted files from Macs, external hard drives and USB drives and camera cards.
Get a file recovery app
With Setapp you get a pack of professional tools for file recovery and Mac maintenance.
An easy way to recover lost files on an external hard drive
Providing you already have Disk Drill Pro version, which you can get automatically by downloading from Setapp:
Disk Drill does have other ways to recover lost files but assuming there aren’t complications, this method is the most effective. Disk Drill Pro recovery app is available from Setapp, along with dozens of Mac apps that will make your life easier. Never have to worry about a crashed or corrupted external drive again.
A few more tips on getting your files back
Try all these apps for free
Get a huge set of top apps for keeping your Mac in shape. Best utilities in one pack, give it a go!
Alternative ways to recover data from an external hard drive
Reset the System Management Controller (SMC) if your Mac shuts down when you plug in an external hard drive. Then use a different port to connect the external hard drive. If you’ve got a battery that you can’t remove:
For Macs with removable batteries, you need to switch them off, remove the battery, then press and hold the power button for 5 seconds. After that, put the battery back in, plug in the power adapter and switch the power on again.
External Hard Drive For Mac
What’s your file format? One reason your Mac isn’t recognizing the hard drive is the file format. Windows uses NTFS file formats, while Macs, up until the introduction of Sierra, have used HFS+. Now, Apple has introduced the Apple File System (APFS) for newer operating systems. It is possible to format a hard drive so it can be read on Mac and Windows computers, providing you format using exFAT. However, if you’re having problems accessing the files and the issue is due to formatting, you will need to connect it to a device it can be read on, and then format the files correctly for the computer you are going to use it on next.
How to make Ext2/Ext3 drives readable on Mac
The common issue is Ext2- and Ext3-formatted drives are not readable on macOS. There are two ways to access such external drives on your Mac – via Linux OS or FUSE system. The easiest would be installing Linux to a secondary drive or virtual machine.
If you go with Linux installation, dual boot your Mac with Linux on another drive and use FAT32 as a transfer intermediary. If you don’t have a drive to install Linux to, use virtual machine as an interface for it. Transferring can be done the same way – with FAT32, or via network.
Another option for reading Ext2/Ext3 disks is mounting disk with Filesystem in Userspace (FUSE). Basically, it works as an extra interface enabling file system access via specially installed modules. Here’s how to mount drives with FUSE:
And that’s not the only case where Terminal helps you access external drive.
Employ the handy all-powerful Terminal, Vmware player for mac. which always comes forward with solutions for difficult problems. Especially if System Information does recognize the USB or hard drive, but continues to hide it from you, disconnect the drive and try to find it using the Terminal, which you can find in Applications > Utilities.
Console is also reliable when it comes to solving tricky problems, although it isn’t always that easy to use. You can find Console under Applications > Utilities > Console. Console shows if an external drive or any error is detected under the Errors and Faults tab. If no errors show up, then the problem is not caused by the device.
To sum up, there are lots of potential solutions for a Mac not reading an external hard drive. If we were to pick one, Disk Drill seems to be the most well-rounded, offering plenty of customizations and power in an easy-to-use interface. Disk Drill Pro recovery app is available via Setapp, along with 150+ Mac apps that strive to make your life much much easier. At the very least, you’ll never have to worry about a crashed or corrupted external drive ever again.
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