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MAC DISK UTILITY PARTITION GREYED OUT EXTERNAL HARD DRIVE HOW TO
MAC DISK UTILITY PARTITION GREYED OUT EXTERNAL HARD DRIVE MAC OS
MAC DISK UTILITY PARTITION GREYED OUT EXTERNAL HARD DRIVE INSTALL

We recommend you erase the volume but not the entire disk to avoid the "Secure Disk Erase Failed - Couldn't Unmount Disk" error. Then keep the Scheme as GUID Partition Map.

MAC DISK UTILITY PARTITION GREYED OUT EXTERNAL HARD DRIVE MAC OS

Name the hard drive (like Macintosh HD), choose APFS for macOS 10.13 or later Mac OS Extended for macOS 10.12 or earlier.

Select Macintosh HD, then click the Erase button.

Ignore this step if your Mac is running macOS Mojave or earlier.

Select Macintosh HD - Data, click the (-) sign, then tap on Delete to confirm the deletion.

On the Utilities window, select Disk Utility.

Select a language, then your account, and enter the password for it.

On an M1 Mac: Turn off your Mac, and press the power button until you see the Options Menu. On an Intel-based Mac: Restart your Mac, then hold Command + R keys until the Apple logo shows up.

That's because you can't erase the drive you are currently running from, and you need to boot into Mac Recovery mode to format the Mac startup disk. If you are trying to format the Mac hard drive or its volumes - Macintosh HD and Macintosh HD - Data, you will inevitably see the Erase button grayed out in Disk Utility.

MAC DISK UTILITY PARTITION GREYED OUT EXTERNAL HARD DRIVE HOW TO

How to fix the Erase button grayed out in Mac Disk Utility? How to fix the 'Erase process has failed' error on Mac? What to do when Disk Utility can't erase Macintosh HD? Here, we will discuss solutions to solve these Disk Utility erase errors so you can format the disk. You may fail to format your Mac hard drive or an external hard drive when the erase button is grayed out on Mac Disk Utility or when you receive the "Erase process has failed" error message.

Thanks for the suggestions.What to do when Disk Utility won't let you erase SD cards, USB drives, and other hard drives on Mac? Afaird it might disappear again and say unformatted. Partition Map Scheme : Apple Partition Map For about a week it showed the hard drive was unformatted and I couldn't even find any data or the hard drive in the finder or on my desktop. Today I turned on my computer & there are my two orginal partions shows up on the desk top I checked it out and all the orgianl data is intact. It would let me choose only 1 partition but after highlighting the 1 partition the apply button still remains greyed out and nothing would happen. I tried that unless I was doing it wrong. I'm positive I lost the data but I'm not worried because the data was backed-up on an external hardrive.

My next thought is to try unplugging the hard drive and replugging it in and see if that does anything.

Media Name : WDC WD5001ABYS-01YNA0 WDC WD5001ABYS-01YNA0 Here's a copy of the information from the information tab in disk utlity for the hard drive in question: It recognizes the hard drive but every option is greyed out.

MAC DISK UTILITY PARTITION GREYED OUT EXTERNAL HARD DRIVE INSTALL

I also tried running disk utility form the install CD and same thing. I can't verify disk, repair disk, erase, partition, etc. However when I select this hard drive everything is greyed out. The only place it shows up is in disk utility. Now I can't find the hard drive on my desk top or in the finder. I'm not sure what exactly happened but I think I may have accidently thrown the hard drive in the trash and deleted it. It has been working fine until a few days ago. I have an additional internal hard drive that I installed myself about 2.5 years ago.