Mac erase disk is greyed out Before doing so I just want to make sure that this isn't something abnormal. SumNeuron SumNeuron 6. You could try the 3rd party app Mountain. It gives you better control of all your volumes. It's not free but may have a free trial period. Richard Brockbank Richard Brockbank 77 1 I appreciate the input. How would my main system not be mounted? Are you factory resetting the Mac because of a problem with it? But I speak only as a Mac user and enthusiast for 30 years, not as someone holding any macOS-specific certification or in-depth knowledge of this issue.

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Or Open System Preferences>Accounts, unlock the lock, click on the little plus icon, make a new admin account, log out & into the new. It's my old workhorse—running Disk Utility's Erase Security Options is grayed out. I have no OS X disk, and there's no Recovery HD.

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Email Required, but never shown. Post Your Answer Discard By clicking "Post Your Answer", you acknowledge that you have read our updated terms of service , privacy policy and cookie policy , and that your continued use of the website is subject to these policies. Furthermore, even if the system prevents you from using the erase free disk space feature, the Finder's Secure Erase option that overwrites deleted files with random data may still be available. However, as with the option to erase free space, it may be best to avoid this feature because the multiple writes it performs will reduce your SSD's lifetime.

If you wish to keep files secure on your SSD device, then the best option to use is encryption.

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With encryption, the system keeps the data scrambled unless a proper password or decryption key is provided, so to securely delete files you just need to delete the decryption keys or password to access them, and for all intents and purposes the files will be irrecoverably deleted.

Apple provides two options for encrypting files in OS X. The first is to use the whole-disk FileVault technology , and the second is to use disk images as encrypted wrappers to house subsets of files instead of encrypting everything. Have a fix? Post them below or e-mail us!

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Discussion threads can be closed at any time at our discretion. Don't show this again. Computers OS X Disk Utility missing options to erase free disk space If you have purchased a new Mac or have upgraded your hard drive on an older Mac, you may find when accessing the option to erase free disk space using Apple's Disk Utility that the controls for doing so are grayed out. The option to erase free disk space might be disabled on newer Mac systems.

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