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How to fix mac not recognizing external hard drive


Summary:

If your mac not recognizing external hard drive and doesn't see it and won't let you access the data. However, you are eager to use it, how to fix it?
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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 and in the Finder. But sometimes, an external drive doesn't show up. Why Mac not recognizing/showing up/detecting external hard drive?

Why Mac not recognizing external hard drive?

This problem can be caused by many factors, including sudden power outage during transferring files, bad USB port, damaged file system, partition issues, virus attack, USB cable of the drive and even hardware issues on the drive.
 
First things: Check all the port
When we encounter external hard drive not showing up in Disk Utility/Finder, the first thing is to check the USB port, the USB cable and the drive.
 
     1. Check the cable from the external hard drive to our Mac is connected properly.
     2. Check the condition of USB cable or USB port. You can try a different cable or port to identify.
     3. Reboot the Mac OS to see if it was an open program or app to stop detecting the drive.
     4. Try attaching the external hard drive to another computer to see if it works on that one too.
 
If you have excluded the USB port and the connection problem and the external hard drive can be found in Disk Utility, so it proves that the drive don't have hardware problem fortunately. So we can fix this issue ourselves, but if there is important data we need in external hard drive which not recognized by mac OS X, we should perform data recovery before fixing to avoid any unnecessary data loss.

How to perform data recovery on can't be recognized external hard drive on mac?

To recover data from external hard drive that can't be recognized on mac, you should install Bitwar Data Recovery on your Mac OS X. it is an all-around data recovery software program for Mac. Which can recover deleted/formatted or lost files from Mac hard drive, external hard drive, USB drive, memory card, external hard disk etc. due to deletion, format, virus infection, partition loss, OS reinstallation, etc. All kinds of files can be recovered including photos, documents, audio, emails, folders, archives, download files, etc.
 
To recover data from external hard drive that can't be recognized on mac, you should install Bitwar Data Recovery on your Mac OS X. it is an all-around data recovery software program for Mac. Which can recover deleted/formatted or lost files from Mac hard drive, external hard drive, USB drive, memory card, external hard disk etc. due to deletion, format, virus infection, partition loss, OS reinstallation, etc. only 3 steps can recover lost data back.

Steps to recover lost data from can't recognized external hard drive

Download and install Bitwar Data Recovery for Mac by clicking the download icons below. The software is compatible with OS X 10.11 and later.

Tips: For macOS 10.13 (High Sierra) and later system requirements, Mac users are not allowed an access to system disk from apps. If you want to recover data from the system disk, please disable the system feature "System Integrity Protection (SIP)" , see the guide on How to Disable System Integrity Protection (SIP) in macOS High Sierra (macOS 10.13)


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Step 1: Select the Partition or Device
Launch the program and connect your external hard drive on the mac, and make sure the program has recognizes it. And then select it and click "Next".
Note: Although your Mac OS X can't detect external hard drive, Bitwar Data Recovery for Mac still can recognize it.
mac not recognizing external hard drive
 
Step 2: Select the Scan Mode
Choose a scan mode on this step based on the data loss reasons. Then click "next". You can choose "Quick Scan" if you have no idea about how it is lost. If it can't scan out the data you lost, try "deep scan". As for "Formatted recovery", it is used to recover data in the case of after you perform a quick format on a partition or hard drive in condition of the capacity of partition or drive haven't been changed before or after formatting.
 
● Quick Scan: This mode can recover deleted files on a partition or device, such as files deleted by command + deleted, emptied from the trash or deleted by other software, etc. If files have not been overwritten by other data, it can be retrieved completely in condition of the files or directory structures.
 
● Formatted recovery: Recover formatted files after performed a quick format on a partition or hard drive in condition of the capacity of partition or drive haven't been changed before or after formatting.
 
● Deep scan: If previous scan couldn't worked to find lost files, try deep scan this time. Deep scan will search every sector of hard drive to find all existing files, but the scanning process will spend more time than quick scan and will not have the original file name in the scanning results.
mac not recognizing external hard drive

Step 3: Select the file type
Choose the file types you want and click "Next". Bitwar Data Recovery for Mac can effectively and completely recover all file types, such as photos, audio, music, documents, etc.
mac not recognizing external hard drive

Step 4: Preview, recover and save files
After scanning, by file name and Type, you can quickly filter the data you want and preview it. Then select the ones you want and press the recover button to have them saved to a safe path.
 
Tips: Please DO NOT directly save the data into the external hard drive before you have not fix the error yet.
mac not recognizing external hard drive

Now the lost data have recovered, you can view them in the new path where you saved.
 
After successfully restored all lost data, we can fix not recognizing external hard drive by formatting it as the steps below without worrying about data loss.

Format the not recognizing external hard drive with Disk Utility

Step 1: Launch Disk Utility from Utilities.
Step 2: Click the icon of not recognizing external hard drive on the left part of the window.
Step 3: Click the Erase function on the top of the Disk Utility window. And under the "Format" menu, choose the file system you want to use.
Step 4: Complete the related information (name, format, and scheme), then click Erase button. It should only take a few seconds to format your drive.
Step 5: When you're done, click on the drive in Finder. You can use it again.
 
Using the method above, you can quickly fix the mac not recognizing external hard drive without losing data.

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