What can I do? With nearly every OS update Apple releases, some external drives are not recognized after the update. The typical symptom is that the device will not mount but the volume is visible and grayed out in Disk Utility. This means that the device is working properly, but the OS does not recognize the volume as mountable.
Repair and Restore Not Recognized Maxtor External Hard Drive/USB without Losing Data
Sometimes the drive does not show up at all. The first thing to do is to see if repairing Permissions with Apple's Disk Utility First Aid feature solves the problem.
If not, try repairing the disk with First Aid. Another possible solution is to zap the PRAM. This is done with a keyboard command while rebooting. Restart your computer and hold down the Command, Option, P and R keys. Consult the Apple web site for details.
If this does not work, then try pushing the PMMU reset button on the logic board. Consult the Apple web site for locations of the button for your Mac. If the drive still does not show up, shut down, disconnect all peripheral devices, and boot from the Mac OS Installation CD.
The later the OS version, the better. Do not reinstall the OS, but when the Installer is loaded up and ready to begin, go to the File menu and use the Disk Utility program. Connect the drive that is having problems, then start the Disk Utility application. If you see the external drive and it is not grayed out, you know the drive is okay.
Run Disk First Aid on it anyway. Then run it on your internal boot drive while you are at it.
Then restart the Mac. When the Mac has restarted and is running on the internal boot drive, reconnect the external drive. To prevent an external hard drive not showing up on Mac turning into an all-out disaster, always backup files on your system hard drive and in the cloud.
1. Change the Finder settings
Check the boxes to determine which drives show up on your desktop.
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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? Don't despair — here's what you can do to recover your files on your own.
Fix Maxtor External Hard Drive/USB Not Recognized Error without Losing Data – EaseUS
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. 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. OnyX will appear unresponsive while the process completes. Once OnyX comes back to life, click on the Maintenance tab followed by Rebuilding.
Problem: Maxtor external hard drive won't open, cannot be detected by PC!
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.
You can confirm whether or not the drive is faulty by trying to connect it to another computer, if you have one. One potential solution is searching online for your particular brand and model. Manufacturers may have included Mac drivers as a separate download. If you have outstanding updates to apply, try applying them and trying again.