Click the Unmount button in the toolbar or beside the disk set name. Upon reboot it was no longer showing upĬhecking the event log for the drive shows:ĭevice SWD\WPDBUSENUM_?_SCSI#Disk&Ven_SanDisk&Prod_Extreme_55AE#7&35b2c743&0&000000# with the following status: 0. In the Disk Utility app on your Mac, select the disk set that you want to unmount in the sidebar. I was trying to update a file on the drive when it failed. If the Unable to Unmount error is triggered by First Aid or non-boot partition formatting, you may be able to fix the error by booting from the recovery partition that is included with all newer versions of Mac OS X. Disk Managment shows it as removable but states “No Media” When first plugged in, it shows up in Devices and Printers with an exclamation point which disappears when the drive briefly shows up on the sidebar for less than a second then disappears again although it remains visible in Devices and Printers. Then, when booting, hold down the Option key to select Recovery Partition. If the Unable to Unmount error is triggered by First Aid or non-boot partition formatting, you may. When I plug it in it is seen by device manager. Methods to fix couldnt unmount disk error 1. Use the Mac Recovery partition to fix disk utility errors.
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