If restarting the computer still results in files that are marked as 'open' then you may need to start your computer from your MacOS X Install disk and run the Disk Utility from there to repair the drives. Sometimes, restarting the computer can cause the operating system to 'close' the 'open' files and things can get back to normal. If a file is flagged as 'open' then the drive cannot be unmounted. Lastly, just perform the original task on the original disk. After that, go to First Aid and verify the disk. Next, in the boot menu, select Disk Utility.
Then, during booting, you should hold down the Option key button to select the attached boot drive. Running Mavericks Running Mavericks I am running Mavericks OX 10.9.1 and am trying to erase an external hard drive that has been partioned. First off, insert the USB boot drive to Mac and reboot. The state of a file being 'open' or 'closed' is actually a series of bits that the computer uses to identify the current 'state' of the file. Question: Q: Disk Erase failed with the error: Couldn’t unmount disk. Typically when this error message is encountered, it is because there are files that are 'open' on the disk. This video show an alternative way to reformat and erase your SD drive when you receive the following error within the disk utility G. No matter what you wind up doing, do NOT format the disk. The question is not IF your hard drive will fail - it's WHEN will your hard drive fail. If the information you are storing is valuable, then make more than one extra copy of it. I can't believe how many people still fail to make backups of their backups. IF it can be mounted, I would then IMMEDIATELY copy the student's projects onto another drive before doing anything else. If I were in your shoes, I would take the external drive to another Mac and see if it can be mounted there.
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