My External Hard Drive Is Not Recognized By My Mac

by Jenefey AaronUpdated on 2021-05-26 / Update for Mac OS

Jul 06, 2020 Your external hard drive is not readable on Mac because it is formatted in NTFS, HFS+, or another format not supported by macOS. A loosely connected or frayed USB cable is another possible reason the external drive is not recognized by your Mac. Change the cable to fix the issue. If your external hard drive is not readable on Mac, try plugging it in slowly. When your computer cannot detect or read your WD hard drive, you can first try to change the USB cable and connect it with another USB port or new PC to see if the drive can be read or not. If the drive can be read via new a USB cable or on a new PC, then the drive is working fine.

So you plugged in your Seagate hard drive into your Mac and it ain't showing up, right? Well, perhaps, the files and folders or the disk itself is unapproachable and therefore, your Mac was unable to detect the Seagate external hard drive. Consequently, the Seagate external hard drive not showing up on Mac Sierra! But worry no more, we've got your back! We are going to uncover some proven ways to fix Seagate hard drive not showing up Mac. Stay glued!

Part 1: Why Seagate External Hard Drive Not Showing up Mac?

Usually, when an external hard drive is plugged into Mac via a USB port, it gets mounted over the desktop. You can even find it under the Devices column on the left in the Finder. Just in case, your Seagate hard drive not showing up on Mac, there can be a number of reasons behind it. Here are they.

  • 1. Chances are that your hard drive may have been corrupted.
  • 2. Perhaps, it may not have been formatted properly.
  • 3. Maybe, the drive got broken internally due to physical damage.
  • 4. Or, your Seagate hard drive is faulty.

Part 2: Quick Fix The Issue of Seagate Hard Drive Not Showing up Mac

1. Check If Connected Properly

First things first, check if the Seagate external hard drive that is not showing up Mac is properly plugged in to the USB port. It is one of the most notable reasons when Mac fails to mount the drive. If you are using an older Mac ensure that the drive is receiving enough power supply. Older Macs need a special USB power cable, which splits up into two USB connectors and both of which has to be plugged into the Mac.

2. Troubleshoot the Seagate Hard Drive

If the above mentioned solution brought you no good, then you need to troubleshoot the Seagate Hard Drive. Try reconnecting the hard drive into a different USB port and check if it shows up or not. If not, you should then plug it in a different Mac or Windows PC to check if it is the hard drive itself that is faulty.

3. Restart your Mac

Performing a restart has known to be an ideal solution to resolve various software glitches in the first place. If your Seagate external hard drive not showing up Mac Sierra, try restarting it with the help of the steps mentioned right below.

Hit on the 'Apple' icon available on the top left corner of your Mac screen and then opt for the 'Restart' option from the appearing drop down menu.

4. Fix The Seagate Hard Drive with Disk Utility

If the above methods were not able to produce good results for you, the next method to fix Seagate external hard drive not showing up Mac is via Disk Utility. Here's what you need to do.

Step 1: Launch the 'Spotlight search' by hitting the 'cmd + spacebar' key over your keyboard and punch in 'Disk Utility'. Hit the 'Return' key afterwards to launch the program.

Step 2: On the left panel of the Disk Utility, you'll be able to locate your Seagate hard drive. If your drive is there and not mounted, it should appear as greyed out. Select the drive and then opt for 'Mount' option. Once mounted, the drive will now turn to normal.

Step 3: If Seagate external hard drive not showing up on Mac yet, try running the First Aid and Erase options to fix or format the drive respectively.

Part 3: The Ultimate Way to Recover Files from Formatted Seagate External Hard Drive

Since, the Seagate hard drive has now been formatted and is now accessible on your Mac, the data stored over it have been wiped off completely. Now, if you wish to recover the data contained within the formatted Seagate external hard drive. We have brought you the ultimate way to serve the purpose. Tenorshare 4DDiG for Mac Data Recovery is your life saver when it comes to recovering data from various data loss scenarios. No matter if the data was stored over your Mac or over the external storage drive, Tenorshare 4DDiG for Mac Dasta Recovery can retrieve the lost data without any hassle.

Step 1: Install and launch the Tenorshare 4DDiG for Mac Data Recovery over your Mac and then opt for the desired location from where the data has been lost. Then hit the 'Scan' button to initiate scanning of lost data.

Note: If you're recovering data over the macOS High Sierra system or higher, you need to grant access to Mac files by disabling SIP first.

Step 2: Soon after the scan completes, you will be allowed to preview the data detected for recovery. You can selectively check the categories or the individual files as well that you wish to recover. Once done, hit the 'Recover' button. Lastly, set the destination location and you're done.

Fix External Hard Drive not Showing up on Mac and Recover Data

Conclusion

Well, that was all about how to fix Seagate external hard drive not showing up on Mac Sierra. We are now positive that you've successfully got your issue resolved. And just in case, you need format your hard drive for some reason, you can always look up to the mighty tool Tenorshare 4DDiG for Mac Data Recovery to retrieve the lost data back.

Applies to: Fix Seagate external hard drive not showing up, not detected, external hard drive light blinking but not work, not recognized in Windows 10, USB not showing up, etc.

Is your Seagate external hard drive not working? This page covers comprehensive solutions to fix Seagate and other brands of external hard drive not working, not detected, or not showing up errors, making your hard drives work again without losing any data.

Quick tips to fix problematic Seagate external disk:

  • Try a different USB port on the computer.
  • Switch to a new cable if the current one is damaged.
  • Try connecting the drive to a different computer.
  • Verify if the drive's light is on. (Light off indicates the power adapter is not connected to power.)
  • Try a different power outlet. (Desktop Drives)

After following these tips, if your Seagate external hard drive is still not detected, move on and try the other further solutions offered below.

Before You Begin: Recover Data from Seagate External Drive First

Since some effective ways to fix external disk problems will definitely cause data loss, such as disk formatting, we strongly recommend that you restore and back up your data from Seagate external hard disk first.

To effectively recover data from not working Seagate external hard drive, you need to use powerful hard drive data recovery software - EaseUS Data Recovery Wizard, which can restore data from inaccessible, corrupted, and RAW external hard drives.

EaseUS data recovery software has the following highlights and features.

Easy External Hard Drive Data Recovery

  • Recover documents, photos, videos, audio files, music, and emails effectively.
  • Recover files from corrupted USB flash drive, emptied recycle bin, memory card, SD card, digital camera, etc.
  • Support external hard drive data recovery for sudden deletion, formatting, drive corruption, virus attack, etc.

Step 1. Locate Seagate drive to scan

  • Use the correct USB cable to connect the Seagate external hard drive to your Windows PC.
  • Run EaseUS Data Recovery Wizard, it will load the external drive and display it under the Devices section.
  • All you need to do here is to select the Seagate external hard drive and then click the Scan button.

Step 2. Check for the scan results

My Seagate External Hard Drive Is Not Working On My Mac

My external hard drive is not recognized by my mac wireless

As soon as the scan process starts, the software will find more and more lost data on the selected drive and display the data in the scan results. You can find the desired files by following its original path from the leftside tree-view pane, or filter a specific file type like Pictures, Word/Excel/PDF documents, videos, etc.

Step 3. Preview and recover

A double-click on a file lets you preview its content. If the preview is with no problem, just select the target files and click Recover. To avoid data overwriting, we suggest you save the recovered data to the other drive instead of the original Seagate drive.

Mac users should download the Mac version to restore lost files. To recover Seagate external hard drive data on Mac, follow this link External Hard Drive Data Recovery on Mac.

How to Fix Seagate External Hard Drive Not Working in Windows

First, open Disk Management and check the state of your external hard drive. Then, refer to appropriate solutions given below.

Workable SolutionsStep-by-step Troubleshooting
Fix 1. Uninstall and reinstall drivesIf your hard drive is not detected in Disk Management, uninstall and update the Seagate drive driver ...Full steps
Fix 2. Format RAW Seagate hard driveIf your external hard drive shows as RAW or unallocated, you need to format your hard drive...Full steps
Fix 3. Restore or create a partitionRestore lost partition from Seagate unallocated space or create a new partition...Full steps
Fix 4. Change Seagate drive letterWhen the external hard drive shares the same drive letter as other disk partitions, Windows won't show it...Full steps
Fix 5. Turn on USB Root HubExternal hard drive may stop functioning correctly if multiple devices are connected to the same USB hub...Full steps

Fix 1. Uninstall and Reinstall Seagate Hard Drive Driver

If your hard drive is not detected in Device Manager or Disk Management, you need to uninstall and update the Seagate drive driver and try again. Here are the detailed steps to do so:

Step 1. Connect the not working Seagate external hard disk to PC.

Step 2. Type device manager in the search box and click 'Device Manager' on the menu.

Step 3. Expand disk drivers and right-click on your external hard drive, select 'Update Driver'.

Step 4. Select 'Search automatically for updated driver software' and restart the PC when the process completes.

Fix 2. Format RAW Seagate External Hard Drive to NTFS

Risk Level: High. Data may get lost after formatting.Difficulty Level: Easy
Warning
Note that formatting will cause DATA LOSS on your hard drive, if you need the data, then data recovery is necessary.

In Device Manager or Disk Management on your computer, if your external hard drive shows as RAW or Unallocated, it means you need to format your hard drive.

Step 1. Connect the Seagate external hard drive to your PC and open Disk Management.

Step 2. Right-click on the not working RAW drive and select 'Format'.

Step 3. Set volume label, set NTFS as the file system, and tick 'Quick Format'. Click 'OK' to start the formatting.

Fix 3. Restore Partition or Create a New Partition on Unallocated Seagate External Disk

Risk Level: Medium, data may get overwritten by creating a new partition.Difficulty Level: Easy

When your external hard drive shows as unallocated in Disk Management, you have two options: 1. Restore the partition, 2. Create a new partition.

#1. Restore Lost Partition and Data from Seagate Unallocated Space

Your first choice is to directly apply the partition recovery software. It will scan and recover all lost partitions and data from the unallocated space.

Step 1. Run EaseUS Partition Recovery on your PC.

Select the disk or device where you lost partition(s), click 'Scan' to continue.

Step 2. Wait for the scanning process to complete.

Let the program scan the selected disk and find the lost partition(s).

Step 3. Preview and restore the lost partition(s).

Double-click on the partition which is marked as 'Lost' with 'Good' recoverability.

Preview the content of the lost partition. Click 'OK' and click 'Proceed' to start restoring the lost partition.

Step 4. Click 'Recover Now' to finish the partition recovery process.

Note: If the program warns you that there is a conflict, back up the listed partition with essential data to an external hard drive first. Then execute the final operation to restore your lost partition.

#2. Create a New Partition on Unallocated Seagate External Disk

Note: This method can lead to data loss, remember to recover data first if you want to use this method.

Here is how to use Disk Management to create a new partition:

Step 1. Connect the unallocated Seagate external hard drive to PC and open Windows Disk Management.

Step 2. Right-click on the unallocated partition and choose 'New Simple Volume...'.

Step 3. Set partition size, drive letter, and file system such as NTFS, etc., click 'OK' to confirm.

Step 4. Click 'Finish' to complete the process.

Fix 4. Change Seagate Drive Letter

Risk Level: LowDifficulty Level: Easy

If your external hard drive shares the same drive letter as your disk partition, Windows won't show the drive letter of your external device. It will show as New Volume in Disk Management without a drive letter.

And, this is probably the reason your external hard drive not detected. To fix this issue, you'll need to add a new drive letter to your Seagate disk. Here are the steps to do so:

Step 1. Connect Seagate external to computer and open Disk Management.

Step 2. Right-click the partition of not working Seagate disk and choose 'Change Drive Letter and Paths...'.

Step 3. Set a new drive letter to the Seagate disk and click 'OK' to confirm.

Fix 5. Turn on USB Root Hub

Sometimes, USB external hard drive devices may stop functioning correctly if multiple devices are connected to the same USB hub, which goes into selective suspension.

You can enable the USB root hub letting the controllers recover the USB port from its unresponsive condition to make your device work normally again:

Step 1. Connect not working Seagate external hard disk to PC.

Step 2. Open Device Manager and expand 'Universal Serial Bus controllers'.

Step 3. Right-click USB Root Hub > Click 'Properties' > 'Power Management'.

Step 4. Uncheck 'Allow the computer to turn off this device to save power' and restart the PC.

How to Repair Seagate External Hard Drive Not Working/Detected in Mac

Follow the following methods to repair the Seagate hard drives to work normally again on Mac:

Before you proceed further, try the quick fixes:

My seagate external hard drive is not working on my mac
  • Seagate drive is not showing on desktop: check Disk Utility: open Finder > Applications > Utilities > Disk Utility.
  • Seagate disk is not detected in Disk Utility: see the System Information/System Profiler section.
  • On macOS 10.13 or higher, click 'View' in the upper left and select 'Show All Devices'.

If all the attempts failed to display your Seagate external hard drive on Mac, try the below 3 methods.

Fix 1. Repair Not Working Seagate External Hard Drive in First Aid

Risk Level: LowDifficulty Level: Easy

If the Seagate drive is unmountable or the mount icon is greyed out, it will prevent your Mac from recognizing or detecting the drive correctly. You can repair the problematic drive in the built-in First Aid utility:

Step 1. Open Finder and click 'Applications'.

Step 2. Locate Disk Utility in 'Utilities' and double-click to open it.

Step 3. Select the unmountable Seagate external hard drive in the left sidebar and choose 'First Aid' at the top.

Step 4. Click 'Run' to repair this Seagate hard drive and click 'Done' to finish.

If Fix 1 fails to work, you may try to format the Seagate disk in Fix 2 or Fix 3.

Fix 2. Format Seagate Disk to macOS Supported File System

Risk Level: High. data will get lost due to formatting.Difficulty Level: Easy
Warning
As formatting a disk on Mac will erase data, make sure you turn to reliable data recovery software like EaseUS data recovery software for Mac to restore all files before formatting disk.

If you use an NTFS Seagate external hard drive on a Mac computer, it won't work nor show up on Mac as Mac only supports APFS, FAT32, and exFAT formats.

To fix the Seagate external hard drive not working error, format the drive to FAT32 or exFAT. Here is a step-by-step guide to do so:

Step 1. Connect the Seagate external hard drive to Mac.

Step 2. Go to the Apple menu, click 'Go' and select 'Applications'.

Step 3. Double-click to open Utilities, locate 'Disk Utility' and double-click to open it.

Step 4. Select the Seagate disk, click 'Erase'.

Step 5. On the Format pop-up window, set a new format like 'MS-DOS (FAT)' and click 'Erase'.

Once the formatting process completes, you can view and access the Seagate external disk on your Mac again.

Fix 3. Remount and Reformat Unmounted Seagate External Disk

If the file system on your Seagate hard disk is corrupted and it's not mounted corrected on Mac, it won't work nor be detected. In this case, remounting and reformatting the Seagate drive is the quickest way to revive it.

Carefully follow the steps below to make the Seagate external hard disk work again on Mac:

Step 1. Go to Applications > 'Utilities' > Double click and open 'Disk Utility'.

Step 2. Select the 'Untitled' Seagate drive, and click 'Mount'.

Once the mounting completes, you'll see the Seagate drive shows up on the left pane.

Step 3. Select your Seagate external hard drive on the sidebar, choose 'Erase'.

Step 4. Rename the drive, choose the format as MS-DOS (FAT). Then click 'Erase'.

After trying the aforementioned methods, you should be able to use Seagate external hard drive on both your Windows and Mac computers.

Why Is Seagate External Hard Drive Not Working/Detected

Generally, 'Not Working' is a state that usually describes a malfunctioning hard disk or external hard drive. Seagate external hard drive not working or not detected is a concerning issue among worldwide Seagate users.

So, what causes your Seagate external hard drive to stop working or malfunctioning? Both software and hardware issues may cause a hard drive not to work as usual. Here is a list of common reasons for this issue:

  • Incompatible file system
  • File system corruption, Invalid file system, RAW
  • The drive turns to unallocated
  • Disk drive letter conflict
  • Hard drive driver is corrupted or out of date
  • The hard drive has too many bad sectors
  • The hard drive is damaged, dead, or not spinning up

Fixing Not Working Seagate Drive Is Possible, It's Your Turn

In this guide, we offered 8 solutions to repair the not working Seagate external hard drive on both Windows and Mac computers. If some fixes cause file loss, you can retrieve all precious data with the EaseUS file recovery solution.

Also, we explained why your Seagate external hard drive suddenly doesn't work or is not detected by Windows or Mac computers. As your data matters, creating a regular backup of your external disk data is helpful. Fixing Seagate external hard drive not working error is possible, and follow the above steps to make your drive work again.