Get a data lifeguard for Mac
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.
After last week's article, ' Pro tip: How to create a bootable USB drive to install Windows on OS X,' I received feedback asking why anyone would install Windows on a Mac? This week's entry deals. Step 1: Shut down your Mac and press the Power key to turn on the Mac; then immediately press Command and R keys. Step 2: You will be directed to the macOS utility section and here you need to select 'Disk Utility' to format the USB drive. From the Disk Utility app, select Mac drive name under Internal section and then click on the 'Erase' button. Step 3: You will get a couple of options from the Format. Format your boot drive using Mac OS Extended (Journaled). My drive was initially formatted as APFS, and an alert appeared saying that the drive could not be used as formatted. Get the macOS Big.
Map a Drive In the Finder, on the Go menu, click Connect to Server. In the Connect to Server box, type the path to the server, for example //servername.cit.cornell.edu/foldername or //myserver.mydomain.cornell.edu/e$. If you want add this server to the Favorite Servers list, click the Plus sign.
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.
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 at why this is happening and how you can get an external drive to appear on your Mac and get recover data to access 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.
Access an External Drive Not Showing on Mac
Get a huge set of top utilities for troubleshooting external hard drives not mounting on a Mac
Start with the basics:
- Check whether the drive is properly plugged in. It sounds obvious, but since this relies on a wire - either a USB cable or HDMI cable - if it's not connected properly then it won't appear on your desktop.
- Faulty cable. Assuming it's plugged in correctly, not wobbly or loose, the cable could be at fault. Try connecting the same device with a different cable.
- Damaged USB or flash drive port. It could be a hardware issue with the Mac. If you've got another port, try connecting the device to that one.
- Reboot your Mac. Sometimes, if a USB disk won't boot, the cause is a macOS issue. Hopefully, some data damage can be fixed by restarting. Choose the Apple menu > Restart. Or press and hold the power button and, when a dialog box appears, click the Restart or press R. Restarting your Mac essentially clears your macOS's memory and starts it up fresh.
- Incorrectly formatted drive. Not every external drive is optimized for Macs. It could be that you are trying to connect something only fit to interact with Windows devices. If you've got a PC or laptop, it's worth connecting and seeing if you can access the files through another device. The best way to look for an incorrectly formatted drive is to go to
Apple (in the top toolbar menu) > About This Mac > Storage.
See if the external drive shows up here. For more information, go to the same menu option, then select System Report. - Mac not formatted to display external drives on the desktop. It could be that your Mac already recognizes the device, but just isn't showing its icon on the desktop screen. Even if that is the case, the drive will still appear in the left-hand column of the Finder menu under Devices. You should be able to access your drive that way, and, in the Finder menu under Preferences > General, you can check External Drives to ensure that from now on it shows up on your desktop too.
- Reset NVRAM. To do this, shut down or restart your Mac, switch it back on and immediately press these four keys together for at least 20 seconds: Option, Command, P, and R. It should look as though your Mac has started again; if it has, release the keys when you hear the second startup chime. Hopefully, the hard drive has shown up now.
- Check Apple's Disk Utility to see if an external drive is showing up. Disk Utility is within System Preferences, or you can find it using Spotlight. If it is visible, then click the option to Mount, which should make it visible on the desktop and in the External Drives option in the Finder menu.
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.
How to show connected devices in Finder
- Go to the Finder menu and select Preferences (Cmd+comma).
- In General, click on External disks to ensure that from now on it shows on the desktop.
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 a 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 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
The most direct reason your external hard drive could be detected by macOS, but can't be opened is the file system problem.
If your drive is having such 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:
- Open Disk Utility. You can search for it using Spotlight or via Finder > Go > Utilities
- Check on your external hard drive, click the First Aid tab and select Run to start running diagnostics.
If First Aid successful in fixing errors, the external drive should be available to mount. If the utility is 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, USB drives, and camera cards.
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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:
- Connect your drive to the Mac.
- Quit all other applications on the Mac, especially those that may be trying to access the external drive (e.g. iPhoto, Words)
- Launch Disk Drill.
- Click on the external drive that you are trying to recover files from. If it has partitions, you will see all of them. If, however, you still don't see any volume to the external drive then you may need to try some of the steps above again or read the Disk Drill Scanning FAQs.
- To avoid the external drive being accessed during the recovery process, click Extras next to the drive or drive partition or file, then select Remount Volume As Read Only. A padlock will appear, protecting the drive during the process.
- Now click Rebuild (or Recover) next to the file(s) you are trying to recover. Once the scan is finished - it may take some time if the files are large - a list of files will appeal.
- Next, click Mount Found Items as Disk button on the bottom-left below the scan results.
- Disk Drill 'strongly suggests saving the files to a different drive than the one you are trying to recover files from. Saving to the same drive substantially lowers your chances of recovery.'
- A drive icon will appear, which once you double click will give you the option to open the files as you would do before they were lost. Drag them to another location, such as your desktop or a folder on your Mac.
- Open the files to ensure they have been recovered properly and safely eject the external drive.
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
- Macs and third-party apps that look after Macs, such as Disk Drill and iStat Menus come with a S.M.A.R.T. (also known as Self-Monitoring, Analysis, and Reporting Technology) status monitor. If a SMART check reports errors, then it could mean the hard drive is at risk of failing completely. Within Disk Utility and Disk Drill, there are several solutions for this: Repair Disk Permissions and Repair Disk. If neither of them works, it's recommended to back up all of the data from the disk, erase it, then run a SMART check again. The external hard drive should show up as Verified.
- Partitions can get lost within hard drives, temporarily hiding all of the information contained within. Disk Drill can help to identify and restore this information.
- Within Disk Drill, you can restore data when a hard drive is damaged or add formatting, which is also something Disk Utility can help with.
- CleanMyMac, another useful app available from Setapp, can help you identify external hard drive errors and repair them. It is an essential tool worth trying when you're having external hard drive difficulties.
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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:
- Shut down and unplug the power adapter
- Press Shift-Control-Option and the power button at the same time. Do this for 10 seconds
- Release all keys
- Plug the power adapter back in and switch your Mac back on
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.
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 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 a 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:
- Install FUSE for macOS or MacFUSE as well as a fuse-ext2 module.
- Use the following Terminal command to enable Disk Utility's debug menu and see all partitions: defaults write com.apple.DiskUtility DUDebugMenuEnabled 1
- Attach your Ext2/Ext3 drive and locate the device name via Disk Utility.
- In your user account, create a folder to be used as a mount point.
- Use the following Terminal command to mount the drive as read-only: fuse-ext2 /dev/disk2s2 /Volumes/mountpoint
- For write support, use the command: fuse-ext2 -o force /dev/disk2s2 /Volumes/mountpoint
And that's not the only case where Terminal helps you access external drive.
Employ the handy all-powerful Terminal, 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.
- Once in the Terminal, type in the command diskutil list
- A list with information about volumes and drives should appear
- Look for a section labelled /dev/disk_ (external, physical)
- Make a note of the whole line after the word disk
- Now put the following command into the Terminal diskutil info disk followed by the number or digits assigned to that disk
- Now you should see detailed information about the drive, therefore confirming that your Mac can and does recognize it
- Eject using the Terminal by entering the command diskutil eject disk followed by the number or digits assigned to that disk
- Physically remove the disk from your Mac
- Plug it back in and your Mac should recognize it
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 200+ 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.
Summary :
If you connect a drive formatted in Mac to a Windows PC, you'll be prompted to format it before use. That is to say, you are not allowed to view anything saved on it before formatting. But the question is: if you click Format disk, your data will be ruined. This post from MiniTool will introduce several useful ways to help you with that; please read carefully.
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Can You Read Mac Drive on Windows
Many people doubt that whether they can read Mac drive on Windows. Some took action: they removed the drive from Mac and connected it to a Windows PC properly. But after connecting the Mac-formatted drive to Windows, a prompt window will pop up automatically on the screen, saying that they need to format the disk before use.
Don't Format the Drive
You should click Cancel instead of Format disk when seeing this prompt. Why? That is simply because the formatting action will damage your data saved on that drive. Is there any other way to read a Mac-formatted drive on Windows? Sure, it is; some effective ways used by other users will be shown to you later on this page.
What Does Formatting a Hard Drive Do
Some users said they clicked on the Format disk button by mistake when seeing the prompt window mentioned above; they were wondering if there's any way to help them recover a formatted hard drive. Luckily, the answer is yes.
What does disk formatting mean?
Formatting a hard disk/drive refers to delete all the file & folders save on a drive and set a certain file system for it. The formatting action is performed to prepare a data storage device (including hard disk drive, solid-state drive, USB flash drive, and SD card) for initial use. Two of the most obvious results of formatting a hard disk are: deleting data and changing file system.
Besides, there are also other benefits of disk formatting:
- Get more space on disk.
- Solve disk problems caused by soft failure.
- Improve disk/system performance greatly.
- And so on.
Do you know how to improve Windows 10 performance effectively?
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It's necessary to improve Windows 10 performance effectively since various problems will occur inevitably on a system that has been used for a long time.
Recover Formatted Hard Drive
The first and the most important thing to do after formatting a hard drive is to recover precious data from hard drive. MiniTool Power Data Recovery can be a good data recovery assistant: it's clean, safe, and professional. Please free download the trial edition to experience this data recovery tool first before you decide to buy it; after that, double click on the setup program to finish installing the software on your Windows computer, on which the Mac hard drives are formatted.
Follow this guide to recover data from Mac formatted external hard drives:
- Click Start now at the end of installation to launch MiniTool Power Data Recovery. You can also open it by double clicking on the software icon.
- Wait for a few seconds until the disk loading process is finished automatically.
- Select Hard Disk Drive from the pane on your left hand side.
- Choose the formatted Mac drive from the pane on your right hand side.
- Double click on the target drive directly or click on the Scan button at the bottom right corner.
- The full scan will be started at once; more and more files and folders will be found during the scan. Please make sure the Mac hard drive is always connected to your computer.
- Browse the found items carefully to decide which files are needed and which are not; add a checkmark into the square box in from of all the files you want to recover. If you can't confirm, go to view the content before recovery by clicking Preview.
- Click on the Save button in the lower right corner.
- Select a storage path in the pop-up window to store the files waiting to be recovered; please make sure it has enough free space left. (You shouldn't select the original Mac-formatted drive as the storage location in order to avoid secondary damage.)
- Click on the OK button in the same window to confirm your selection.
- Then, wait until all the files saved on Mac hard drive have been recovered successfully to appointed place. A prompt window will show up to inform you of the recovery result.
MiniTool Power Data Recovery is also a great tool for recovering formatted SD card or broken/corrupted USB stick. The recovery steps are basically the same expect that you should select Removable Disk Drive from the left sidebar as mentioned in step 3.
After the data recovery process has been completed, you may transfer back the recovered files to the formatted disk as long as you can confirm that you've got back all the files you need.
What about Windows 10 read Mac drive? Please read the following sections.
Can a Mac external drive be read on a PC?
A lot of people are wondering whether they can read Mac drive on Windows 10 with freeware. In fact, there is both free and paid software to help people read Mac drive on PC easily, without formatting the disk. I'll introduce some of the useful software you can use on Windows 10 to read files and folders from Mac-formatted drive.
Choice 1: HFSExplorer
HFSExplorer is completely free; it's a basic application designed to help users read Mac-formatted hard disks and disk images. HFSExplorer gives support to various file systems: HFS (the Standard file system on Mac), HFS+ (the Extended file system on Mac OS), HFSX (the Extended Mac OS file system with case sensitive file names), etc.
What Does HFSExplorer Allow You to Do
- Browse volumes on Mac by using a graphical file system browser.
- Check the volume related information.
- Extract files you need (copy files to Windows hard disk free).
- Mount & read disk images like .dmg and .sparsebundle.
- Create disk images from the volume on Mac.
The partition schemes including Master Boot Record, GUID Partition Table, and Apple Partition Map are supported by HFSExplorer.
Format External Drive Mac Os
Attention!
You need to install Java first if you don't have it on your PC since it's required (Sun's Java SE runtime environment version 5.0 or greater in which OpenJDK works fine).
HFSExplorer: Launch error
No Java runtime environment found. HFSExplorer cannot function without Java.
Press 'OK' to open up http://www.java.com where you can download a Java runtime environment for your system.
You should just click OK as prompted to download & install proper runtime environment when seeing the window above.
How to Use HFSExplorer to Read Mac Hard Drive on Windows
- Connect the Mac-formatted drive to your Windows PC.
- Run & use HFSExplorer as administrator.
- Select File from the menu bar.
- Choose Load file system from device from the submenu. You can also press Ctrl + L.
- Click Autodetect to load the drive.
- Choose the files & folders you want to view on Windows.
- Click Extract.
- Select a folder as the destination.
- Expand the folder to read files on Windows PC.
Attention:
- HFS/HFS+/HSFX partitions can all be detected by using HFSExplorer.
- You can also Select a device or Specify device name manually in step 5.
If the connected external hard drive is not showing up on PC, you can't detect it in step 5. You must make it appear in Windows first.
Is there any other hard drive reader for Windows? Of course, yes; please move on.
Choice 2: Apple HFS+ Drivers
Another way to access HFS + files in Windows 10 for free is installing Apple HFS + drivers.
Steps to Read Mac Drives on PC with Apple HFS + Drivers
First, you should make sure you don't have Paragon or MacDrive (the hard drive readers I will talk about later) on your Windows computer. If you do, please remove them now.
Second, you should download the correct Windows driver package to your local drive.
Third, you should configure your Windows as follow.
- Go to the default download path (Downloads folder) to extract the downloaded zip file.
- Find AppleHFS.sys and AppleMNT.sys files.
- Copy them by pressing Ctrl + C (you can also do it by right clicking & choosing Copy).
- Go to this path: C:WindowsSystem32drivers.
- Copy them by pressing Ctrl + V (you can also right click on any blank area & choose Paste).
- Navigate to the downloaded folder to find Add_AppleHFS.reg file.
- Open the .reg file to bring up a Registry Editor prompt window.
- Click on the Yes button and then click OK.
- Restart your computer to make changes take effect.
Fourth, you should connect the Mac-formatted drive to your PC -> open File Explorer (also called Windows Explorer) -> locate that drive under This PC -> access files you want.
Choice 3: HFS+ for Windows
Though the Paragon HFS+ for Windows is a paid hard driver reader, you'll love it after using.
What Can Paragon HFS+ for Windows Do for You
- The speed is fast and the performance is stable.
- The Mac file systems are integrated into Windows File Explorer.
- It provides full read and write access to Mac drives formatted with HFS, HFS +, and HFSX (just like other drives in Windows).
- It allows Windows programs to read from or write to the Mac-formatted drive on Windows.
- There are additional features that worth the cost.
How Much Does It Cost
The Paragon HFS+ for Windows is sold on the official website for $19.95 with a single seat license; $49.95 with one license worked on 3 PCs.
If you don't want to spend money in reading Mac drive on Windows, you should download the trial edition; it is free for use for 10 days. You can access, copy files from or to the Mac drive during this period; it's enough.
Choice 4: MacDrive
If your Mac drive is formatted with APFS (Apple File System), you won't be able to read Mac hard drive on Windows because there are no free apps designed for it. But you have many choices of paid applications to access & edit Mac drive files on Windows; MacDrive is a popular one designed by Mediafour.
Merits of MacDrive
- It is used to help users read data from and write data to Mac disks from Windows directly.
- You can read both APFS and HFS+ drives in File Explorer.
- It allows you to create and partition Mac disks on your Windows.
- A graphical interface is offered for Mac-formatted drives verification, format, and repair.
- It's a trusted solution which can date back to 1996.
The only drawback of MacDrive seems to be the selling price is higher than some similar tools. You need to pay $49.99 for the Standard version or $69.99 for the Pro version.
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Is it worth the price? Yes, if you have such needs; it also includes unique features like support for Mac-formatted RAID disks.
Choice 5: Paragon APFS for Windows
Paragon also designed an APFS for Windows app for reading APFS Mac drive on Windows; it is considered as one of the main competitors of MacDrive.
Features of Paragon APFS for Windows
- It provides read and write access to Mac drives formatted with APFS.
- It also allows you to access and edit compressed and cloned files (you can only access the encrypted volumes without making any changes).
- It gives support to auto-mounting at start-up; the partition tools of MacDrive are not included in this app.
The biggest disadvantage of Paragon APFS for Windows when compared to MacDrive is the HFS+ support. The biggest advantage of Paragon APFS for Windows over MacDrive is the price – it costs only $49.95 for one license worked on 3 PCs.
Of course, there are many other tools available for you to read Mac drives on Windows (10/8/7, etc.).
Bonus Tip
You can format your Mac hard drive to exFAT, which supports both Windows and Mac OS X. In this way, you can get full read and write access to exFAT drives on Windows without any additional third-party software.
The only thing you need to worry is that the data on Mac drives will be removed. So you need to turn to MiniTool Power Data Recovery as mentioned in part 1 to recover the files you need after formatting.
How to format a hard drive? Basically, there are three ways.
- Right click on the drive in File Explorer -> choose Format.
- OpenDisk Management -> right click on the target drive -> choose Format.
- Format Partition with MiniTool Partition Wizard – a professional disk manager.
Final Thoughts
Though you can't access a Mac-formatted drive on a Windows computer directly, there are useful ways and tools to help you read Mac drive on Windows easily. Please just follow the steps mentioned above and choose the tool depending on your needs.
