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Susan Lawlor writes in with a common problem:
I'm trying to securely erase my poor sad iMac before donating or recycling it. It's my old workhorse—running 10.6.8. Disk Utility's Erase Security Options is grayed out. I have no OS X disk, and there's no Recovery HD.
It's admirable to erase your system before you sell—especially with secure erasure—to avoid leaking personal data to someone who buys it or obtains the disk drive. While the odds are likely very low someone would be able to extract data (or be interested in it), you can try to reduce those odds to what is effectively zero.
Susan has a number of options of how to proceed, but there's a bit of navigation along the way. She's running 10.6.8 (Snow Leopard), which didn't include Recovery HD. Security Options in her version of Disk Utility is grayed, because you can't erase a disk from its startup volume. (That option is always unavailable for SSDs, but an older iMac won't have an SSD.)
Becky Macon Massmutual Mississippi
Here are the easiest ways to erase that drive securely by degree of difficulty:
Use Target Disk Mode. With two Macs that both have Thunderbolt or FireWire ports, connect them with the appropriate cable, and follow Apple's instructions (either hold down the T key after restarting the one to erase or use Startup Disk on that computer before restarting it). The Mac to erase mounts as a drive, and Disk Utility can be used with it.
Install OSX on an external drive or borrow one with OS X installed. Booting off that drive will also allow erasing via Disk Utility.
Upgrade to a newer version of OS X and use Recovery HD. Snow Leopard with the Mac App Store installed should let you download at no cost a later version of OS X. All versions after Snow Leopard include and will install Recovery HD, from which you can then boot and run
iMac models released starting in 2010 can use Internet Recovery, but first have to be upgraded at least to Lion and some need a firmware update installed, so that's not the simplest path to pursue.
A related question came in from Becky Steinke, who was trying to erase a 2008 MacBook. She tried to use the Recovery HD startup (holding down Command-R after restarting) and had no luck. Every 2008 and later MacBook Pro and MacBook can install Mac OS X 10.7 Lion, which should be able to install the Recovery partition. If possible, upgrade it to Lion, restart, and use Recovery HD to erase, or use one of the other options above.
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A few years ago around WWDC time I made the mistake of installing the fresh new beta of OS X on my only Mac. Shortly after that, I needed to submit an update to one of my apps…only to find out that you can't submit release builds to App Store Connect (then iTunes Connect) from a beta version of Mac OS. After some furious googling, disabling system integrity protection, and editing some plist that I was undoubtedly not supposed to touch, I tricked Xcode into thinking I was using the previous version of the OS. Lesson learned.
Since then, I've waited until September to update my Mac. This year, however, is different. This year is Marzipan.
So, I took to Twitter and asked for recommendations for external SSDs. Several people recommended the Samsung T5 Portable SSD, so that's what I got. Fortunately it arrived today, just in time to install macOS 10.15 on Monday!
Becky Mcshane
If, like me, you've never run macOS from an external drive, I found some very good instructions over at Macworld. I'm looking forward to exploring all the new features (and Marzipan apps!) that macOS 10.15 will bring without worrying about messing up my main development environment. How about you? Will you be installing the new macOS beta next week?
