On the left hand side of your finder, check the list of devices that are mounted. There may be more than one disk mounted. Eject all the mounted ones except for the one that you have to format. Now go to disk utility, select external hard drive and erase. This should work.
[Solved] Erase process has failed when formatting USB – Mac Disk utility. Jinson K V 3 Personally, I had this issue because I used my USB as a boot drive. External hard drive not showing up on Mac? Here's what to do To run Fist Aid on an external hard drive: is broken or formatted using a file system that the Mac How to Fix “Windows was unable to complete the format” Error 22 Jun 2019 How to Fix “Windows was unable to complete the format” Error. Don't fret, it's Wanting to format your SD card, USB drive, or external hard drive is a good move. It's a disk management software for Windows and Mac users. External Hard Drive 'Read Only' on Mac? Fix It Now! – EaseUS 16 Jan 2019 Summary. An incompatible file system, faulty permission settings, and unexpected formatting error are all likely to cause your external hard
Cannot format new external drive | MacRumors Forums The top item in External will be your W-D device - Select that top item under External. Now, click Erase. You will get an erase window. Name your drive, whatever you like. Change Format to Mac OS Extended (Journaled), and change Scheme to either Apple Partition Map, or GUID Partition Map. And, finally, Click the Erase button in that Window Recover Data from Mac External Drive with No File System You can’t make the external hard drive mount on Mac by switching to a new set of USB cables. Neither, one can format the external hard drive with a new file system since doing this will erase all the inaccessible data from the external hard drive on Mac. Erase the Drive only if Backup is Available
How to Format External Hard Drives on a Mac | Sweetwater 17 Oct 2019 Format External Hard Drive Mac macOS Hero Image That means that while macOS can read NTFS drives, it is unable to write data to them 3 Ways to Fix 'Couldn't Unmount Disk' Error on Mac 1 Nov 2019 'Disk Erase failed with the error: Couldn't unmount disk.' Formatting the hard drive or partition scheme will recreate a new HFS file structure on the The USB boot drive is attached to the Mac, and the system is rebooted How to format your drive in macOS 10.11 and above | Seagate
28 Mar 2019 Normally when you plug in an external hard drive to your Mac's USB is unable to repair the disk if is likely that the drive is either formatted
Instructions for how to format your external drive so that it will be fully usable in listed then change the view in disk utility to show the drive and the volume. Disk Utility Errors and Questions for macOS 10.11 and higher If you are using it for Mac only then select a format specifically for macOS. If you have something open on the drive like a Disk Image or if something else is How to Open an External Drive Not Showing on Mac
If you're having this problem trying formatting the new HD via a USB/SATA cable (instead of in your macs HD bay) before you return the drive or Fixing an external hard drive that's not showing up on Mac 24 May 2018 Your Mac not recognizing an external hard drive can be cause for panic. But try Try a different USB cable — even cables with no visible defects can fail. Test the hard drive on a PC — it could be formatted for PCs and not Fix: The Disk You Inserted Was Not Readable by This
Go to Disk Utility and expand the external hard drive list there (step 4 above). If your My Passport drive shows up in the list go ahead and format. b. Use a Windows PC to format your WD My Passport drive first to ExFAT. Then try again on the Mac. c. Use a Mac with an older release of Mac OS to format your WD Passport drive. d. Download the WD Format external drives to Mac OS Extended before using with Many external hard drives come pre-formatted as FAT 32. This is a native Windows file format that can be read by Mac OS X, but is not ideal for use with Aperture. Before you begin to use your new external hard drive with Aperture, reformat it to the Mac OS Extended file system: Be sure your drive is attached and mounted. How to Format External Hard Drive to FAT32 in Windows
How to repair external hard drive on Mac without losing data?