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How to Fix Mac not Recognizing External Hard Drive?


Summary:

If your mac not recognizing the external hard drive and do not let you access the data. How to fix it? This article offers you excellent data recovery software to recover your files from the external hard drive.

 Bitwar Data Recovery for Mac downloadBitwar Data Recovery for Windows download


Most of the time, when you connect an external hard drive to your Mac's USB port, you soon see it mounted on the desktop and in the Finder. But sometimes, an external drive doesn't show up. Why is Mac not recognizing/showing up/detecting the external hard drive?

Why is Mac not recognizing the external hard drive?

This problem can be caused by many factors, including sudden power outage during transferring files, lousy USB port, damaged file system, partition issues, virus attack, a 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 whether the cable from the external hard drive to our Mac is appropriately connected.
     2. Check the condition of the 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 can be found in Disk Utility, it proves that the drive doesn't have a hardware problem. It means that we can fix this issue by ourselves, but if there is essential data we need in external hard drive which is not recognized by Mac OS X, we should perform data recovery before fixing to avoid unnecessary data loss.

How to perform data recovery on an unrecognized external hard drive on mac?

To recover data from the 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, and many other reasons. All kinds of files can be restored, including photos, documents, audio, emails, folders, archives, download files, etc. You need to do three steps to recover lost data.

Steps to recover lost data from unrecognized 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 to the system disk from apps. If you want to recover data from the system disk, please disable the system feature "System Integrity Protection (SIP)," here are the guides 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 to the mac, make sure the program has recognized it and click "Next."

Note: Although your Mac OS X can't detect the external hard drive, Bitwar Data Recovery for Mac still can recognize it.

Select Device

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 lost. If it can't scan out the data, try "Deep Scan." As for "Formatted recovery," it is used to recover data in the case of performing a quick format on a partition or hard drive in the 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 + delete, emptied from the trash or removed by other software, etc. If additional data have not overwritten files, it can be retrieved entirely in the condition of the files or directory structures.
 
Formatted Recovery: Recover formatted files after performed a quick format on a partition or hard drive in the condition of the capacity of partition or drive haven't been changed before or after formatting.
 
Deep scan: If the previous scan couldn't work to find lost files, try deep scan this time. Deep scan will search every sector of the hard drive to find all existing data, but it will spend more time than a quick scan and will not have the original file name in the scanning results.

Select Scan Mode

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.

Select File Type

Step 4: Preview, recover and save files

After scanning, you can filter the data you want and preview them by double-clicking. Then select the files you want and press the recover button to have them saved to a safe path.
 
Tips: DO NOT directly save the data into the external hard drive before you fixing the error yet.

MP3 Result


Now the lost data have recovered, you can view them in the new path where you saved.
 
After successfully restoring 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 the Erase button. It only takes a few seconds to format your drive.
Step 5: When it is done, click on the drive in Finder. 
 
Using the method above, you can quickly fix the mac not recognizing external hard drive without losing data.

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