Mac or Windows computer not recognizing your external hard drive or flash drive? This is a common problem, especially when connecting hard drives between Mac OS X, Windows and Linux. It can also happen on a single system where it was working just fine for a long time and then suddenly stops being recognized by the operating system.
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Sometimes the fix is easy and sometimes it is a bit more complicated. In this article, I’ll try to go through the different solutions on Mac and Windows for fixing this issue. How the drive is formatted and what file system is being used is the most common reason why drive is not recognized.
Assign Drive Letter
The other main reason is that the drive simply is not being recognized by Windows or Mac and therefore won’t even show up on your system at all. This is usually a problem with drivers or hardware. In order to figure out whether your problem is related to formatting or to not being recognized, go to Disk Management in Windows or Disk Utility on OS X and see if the drive shows up there.
If the drive shows up here, but not in Windows Explorer, you might have to assign a drive letter to the disk. Normally, Windows does this automatically, but sometimes because of other connected devices, your external hard drive will be recognized, but not have any drive letter assigned to it. In Disk Management, just right-click on the disk and choose Change Drive Letter and Paths.
Pick a letter for your drive and you should be good to go. If the drive is showing, but you’re getting messages about the drive needing to be formatted, etc., then read the next section below.
On Macs, the drive should automatically appear on the desktop. If not, go to Disk Utility and check to see if it appears under the heading External.
If the drive is showing here, but not on the OS X desktop, then click First Aid to try and repair the drive. If the drive has a file system not recognized by OS X, you’ll need to erase it and the format it using FAT or HFS+.
If the drive is not showing up in Disk Management or Disk Utility at all, you have some other type of problem. Scroll down to the Not Showing Up section below.
Format Drive
When it comes to file formats, there are a couple of major formats that are used about 99% of the time: FAT32 and NTFS for Windows and HFS+ (Mac OS Extended) for Macs. Now OS X can read and write to FAT32 formatted drives, but can only read NTFS volumes.
Windows is worse in the sense that it cannot even read or write to HFS+ formatted volumes by default. You can get Windows to do it, but you have to purchase third-party software. The only other option is to format the hard drive and use the FAT32 format for the best compatibility.
https://rsvkhz.weebly.com/blog/dragon-for-mac-reviews. When you connect a HFS+ formatted drive to Windows, you’ll get a message stating that the drive needs to be formatted in order to be used.
If you see this message, it just means that Windows does not recognize the file system on the drive. Make sure you connect the drive to the appropriate operating system and backup any data that you might need before performing a format.
So what’s the best format to use so that you can see your hard drive on multiple operating systems? The legacy format that is most compatible is FAT32, but it limits you to only 4 GB for max file size. You can read my previous post on how to format an external hard drive using FAT32.
If you need support for bigger files, then you should use the exFAT format. It’s newer and supports much larger files, but only works with newer versions of OS X and Windows. You’ll have to be running OS X Snow Leopard (10.6) or higher or Windows XP or higher.
In Windows, you can choose exFAT as the file system format in addition to NTFS and FAT32. When you format a drive in OS X using Disk Utility, you can also choose the exFAT format if you like.
Drive Not Showing Up
If you connect the drive to the computer and nothing happens, one of several things could be going on: your hard drive might have a problem, the correct software or drivers are not installed on your system, or there is something not working properly with the operating system. Windows 10 compatible external dvd drive. Let’s start with some common problems and their solutions.
Windows – Device Manager
Sometimes old drivers can cause a device to malfunction when connected to Windows. You can try fixing this by first going to the command prompt (Start and type in CMD) and running the following command:
Once you do that, open Device Manager (Start and type in device manager) and then click on View – Show Hidden Devices.
Expand out Portable Devices, right-click on any items that are grayed out and choose Uninstall. Restart your computer and try to connect the hard drive again.
In addition to Portable Devices, you can expand out Disk Drives and try to uninstall the device from there if it is not showing up properly in Windows Explorer.
Windows – USB Device
If you connect your USB drive to Windows and get a USB Device Not Recognized error, make sure to check out the link on how to fix that particular problem. Windows tries to blame the device for malfunctioning, but it’s normally a problem with Windows.
USB Ports/Secondary PC
You can also try plugging the drive into another USB port on the computer to make sure it’s not a problem with that particular port. If you are connecting to a USB hub, disconnect that and try to connect the drive directly to the computer.
The only way you can really tell if the problem is with the computer or the hard drive at this point is to connect the drive to another computer. If the drive doesn’t work on another computer, it’s highly likely something is wrong with the drive itself.
Drive Tools
If it appears that there is a problem with the drive itself, you can try to download the diagnostic tools from the drive manufacturer. Just about all the major brands like Seagate, Western Digital, Toshiba, etc., have these diagnostic tools.
You can also read my previous post on checking your hard drive for errors for more information and more tools to test hard drives. If the drive has become corrupt or has bad sectors, these tools can fix it.
USB 3.0 Drives
If you have a USB 3.0 external hard drive, there are a couple of extra considerations you have to take into account. Firstly, make sure you are using an appropriate cable. I’ve run into several clients that had this problem and fixed it by simply using a different USB cable. So try out several cables before you give up.
Secondly, you might need to update the driver in Windows. Again, go to Device Manager, expand Universal Serial Bus controllers, right click on the one that has USB 3.0 in the text and choose Update Driver.
Power IssuesPortable Hard Drive For Mac Book Pro
Cheese sauce for macaroni cheese. The only other possibilities with this type of problem are lack of power or complete hard drive failure. Make sure the hard drive has the correct external power adapter and that the light on the front of the drive is turning on and is not orange or red. Also, try using different cables as some are able to carry more power than others.
Hopefully, this article will help you get your external hard drive recognized by Windows or Mac. If not, post a comment and I’ll try to help. Enjoy!
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.
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
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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.
How 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 FinderPortable Hard Drive For Mac
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.
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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:
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
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Alternative ways to recover data from an external hard drivePortable Hard Drive For Mac Thunderbolt
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.
Apple Mac External Hard Drive
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, 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.
Portable Hard Drive For Mac Mini
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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