How to fix external hard drive not detected on mac

Step 3: Preview the searching results, choose files you need, and click "Recover" to get them back. If your Seagate external hard drive can show up and mount in Disk Utility, the drive is still in normal state. You can't see it showing up in Finder or on the desktop is usually because you haven't setup your Mac to do so. Select "External disks" under "Devices" or "External disks" under "Show these items on the desktop" , and then your Seagate external hard drive will show up as set. If you failed to fix the not recognized Seagate external hard drive through the two solutions above, it is probably the drive has some hardware problems and can't be fixed by software.

Under that condition, you need to seek help from a local data recovery company. Store current Mac Data Recovery. Windows Data Recovery. NTFS for Mac. Free Download. Still have questions? Contact us. How to recover deleted videos from SD card on Mac? How to undo empty Trash on macOS?

How to fix Mac doesn't recognize external hard drive on Mojave?

How to fix USB drive files not showing up on Mac? APFS partition recovery: External hard drive is not readable on macOS Mojave, how to fix? Open the Finder. Click Finder. It's in the menu bar at the top of the screen on the left next to the Apple icon. This displays a drop-down menu. Click Preferences…. It's the second option in the "Finder" menu.

This displays the preferences menu. Click the General tab. It's the first icon at the top of the preferences menu. It has an icon that resembles a light switch. Click the checkbox. Method 5. Reset the SMC.


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  3. How to fix/repair Seagate external hard drive not recognized on Mac??

The way you reset the SMC is different depending on what type of Mac you have. Method 6. Click Applications. It's in the side bar to the left. This displays all the applications installed on your Mac. Click Utilities. It's the blue folder in the Applications. This displays all the utility programs for your Mac. Click the external hard drive volume. It's listed below the drive name in the sidebar to the left.

This displays how much of the external hard drive has been used. Click Mount if available. This button is at the top of the Disk Utility app. This forces Mac OS to read the external hard drive. If the button says "Unmount", the external hard drive is already mounted.

If the "Mount" button is grey out, Mac cannot read the disk. Click First Aid.

6 Ways to Fix an "External Hard Drive Not Detected" Error on PC or Mac

If there is no volume for the external hard drive, or the mount button is greyed out, Mac cannot access the external hard drive. Click "First Aid" at the top to scan the external hard drive for errors. Click Run. It's in the prompt that appears when you click "First Aid". This runs a scan of the external hard drive and attempts to fix any errors. Click Repair Disk. If First Aid finds errors on the external hard drive, it display a list of the errors and ask if you want to repair the external hard drive.

Does the external hard drive show up in Disk Utility?

Click Repair Disk to fix the errors on the external hard drive. If First Aid is unable to repair the external hard drive, it may be formatted in a file system that MacOS can't read, or it may be a faulty external hard drive. Click Partition or Erase. If the external drive has be formatted using a file system that can't be read by MacOS, you could either partition the unused portion of the external hard drive, or erase the entire drive and reformat it in a file system that can be read by MacOS. If you plan on only using the the external hard drive, select Mac OS Extended as the file system. Erasing and reformatting your external hard drive will erase all the contents on your external hard drive.

Use that as a last resort. If possible, try to back up the contents of the external hard drive to another computer before reformatting it. Use the following steps to partition or erase your external hard drive: Click Partition in Disk Utility. Type a name for the partition next to "Name: Select a format for the partition next to "Format: Type how much space you want to allocate to the partition next to "Size: Here are your macOS file system options and how to pick the best one for you.

Read More that your computer cannot write to. Here's how to fix a locked Mac drive and get it working again. If you find your drive here, try accessing it. Check the boxes to determine which drives show up on your desktop. This system utility lists all connected drives, with mounted or unmounted partitions listed below. If your drive appears in Disk Utility but you are unable to mount any partitions, you may still be able to recover data from that drive. Digital camera SD card corrupted itself?

First of all: Have some basic checks

Don't despair — here's what you can do to recover your files on your own. Some users have reported success in getting their previously missing drives to show up by rebuilding the macOS launch services database. You can rebuild the database by downloading and installing free maintenance app OnyX.

Fix External Hard Drive Not Showing Up Issue on Mac

Launch it and input your administrator password so that OnyX can make changes. The app may ask to verify the structure of your desk; click Continue and wait if so.

External Drive Troubleshooting – Mac

OnyX will appear unresponsive while the process completes. Once OnyX comes back to life, click on the Maintenance tab followed by Rebuilding.


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  • Make sure that LaunchServices is checked you can uncheck the rest then click Run Tasks at the bottom of the window. While this happens, Finder may become unresponsive. Once the process is complete, restart your Mac. Try reconnecting your missing drive once it reboots. Some older drives require USB leads with separate power connectors. You can try switching out the cable for another and seeing if that makes a difference.