Erase external hard drive mac el capitan

Click Erase and then click Done. With the data erased from your partition, you still need to delete the now-empty partition in order to reallocate its space to the rest of your hard drive. To do so, select your hard drive from the left panel and then click the Partition button at the top of Disk Utility.

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On the pie graph on the left, click the wedge that represents the partition you just erased. Click the " - " button and then click Apply.

After a minute or so, Disk Utility will finish applying changes to your drive and deem the operation successful. Also note that multi-pass erases on solid state drives will increase wear on their memory cells, slightly shortening their usable life each time you do that. Either way the ability to securely delete files easily, being lost from OSX is for me a deeply concerning issue.


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It cannot have been that difficult to offer an opt in for those that can use it and deny the opt-in to systems that cannot. Ideally I will have a backup of the drive, then attempt to Erase free space, but I also though asking here would get an answer quickly.

How to securely delete files in OS X ‘El Capitan’ | MacIssues

Thank you in advance and thank you for the article. Or you can use secureremove. A 3rd party app that includes 10 wiping algorithms and finder integration. Without a doubt, many people enjoy and benefit from his articles about Mac OS. But he would do a service to his readers by having them fact-checked by more qualified experts, or at least reviewing the topic on Wikipedia or StackExchange. This article is a case in point.

But none of the utilities or commands mentioned are effective with SSD drives. And attempting to securely delete individual files is unquestionably an exercise in futility. It is a waste of time for any drive manufactured within the past twenty years or so, where a single-pass overwrite is entirely sufficient. If you understand this technology please submit your best options for the millions of mac users like me who have hard disk drives but have upgraded to El Capitan. If the article made it clear that the methods presented are only useful for hard disk drives, I would not have bothered to comment.

Even then, a brief mention of data leakage issues through autosave buffers and so on, and the advantages of encrypted disks and dmg files, would have been appropriate.

How to format a startup drive for a Mac

Apple removed the options because it is simply not possible to securely delete unencrypted files from any USB flash, SSD, or fusion drive, using any software tool. Doing nothing, and knowing that your files are not secure, is better than do-nothing options that make you think they are. Thanks for sorting me out. I have been irritated by the secure erase thing in previous versions. I also suffer bereavement sniff at losing the OS X free-space-wipe feature after upgrading to El Capitan from It failed, of course, just like the others reported, with the error code , a POSIX-permissions failure.

The process was run from a standard user account without the benefit of super-user sudo. Let me go change these pants and then. How to format hard drive for Mac OS X There are many reasons why OS X For example, before resell the Mac, the OS X Here are two solutions to help you format hard drive in OS X Here, run it from Launchpad, it will list all hard drives and external hard drives on your Mac. Just click the hard drive you want to format. Disk Utility can help you easily format hard drive in OS X Unlike Disk Utility, AweEraser for Mac will permanently erase all data on the hard drive during formatting process.

Actually, it is pretty simple.