could not unmount disk when formatting usb mac

The external storage drive may not be connected or plugged in properly.

This issue could also occur with the hard drive on your Mac. The external storage device or the flash device is infected with malware. The hard disk or the areas that you are trying to erase or format on your hard disk are corrupt. Below are some of the most common reasons: This error is also typically caused by a software conflict or an issue with your hard drive. Most of us aren't tech-savvy, so you might be asking yourself, what does this error actually mean? Well, this message is displayed when an attempt to erase a data storage device has failed because of hardware problems or other complications. In addition,this error shows alongside an icon of an internal SSD along with a red caution sign on the screen in the Disk Utility window. Click Done to continue', the details of this error vary depending upon the type of format that you are trying to erase like 'couldn't unmount disk', 'couldn't open device'. While it's all entitled 'Erase process has failed. It's common to come across this error if you are trying to erase a USB flash drive or an external hard drive on your Mac in the Disk Utility app. Why Does the Error Erase Process Has Failed Occur? This blog post will give you some information about it and the commonly workable tips on fixing the 'Erase process has failed' issue. You may be freaking out right now, but don't worry. If you're reading this article, your Mac has likely crashed or is showing this error, and the erase process has failed. For instance, if you try to format a corrupt USB, SSD, or any other kind of storage device using a Mac, you may encounter an error reading 'Erase process has failed.' It may be quite confusing and frustrating. But sometimes things go south unexpectedly. Mac computer makes life easier from various aspects: education, recreation, work, etc. Click Done to continue.' How do I sort this?

DU tries erasing, then tells me 'Erase process has failed. I've clicked 'Show all devices', selected the HD (as opposed to the individual partitions), gone with the default format (Mac OS Extended (Journaled) and scheme (GUID Partition MAP), and clicked Erase. I want to erase a partitioned (and fairly new) external HD, using Disk Utility, so I can repartition it.

Could not unmount disk when formatting usb mac