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Can You Use All Purpose Cleaner On A Install OS XBut how can you be sure? Readers have written in with several related questions, so let’s talk this week about erasing a drive, how FileVault 2 encryption can play into it, and out-of-date Recovery Drive partitions.Reader Jim Kay, who asked about migrating from one Mac to another a couple of weeks ago, had a second question as well that opens a delightful can of worms:Since I’m looking to resell my current Mac, how do I reinstall OS X, so as to wipe my hard drive and resell knowing the new buyer has a cleaned-up computer, and my files are nowhere to be found on it?Wiping or erasing a drive has a surprising number of definitions. Built-in formulas, pivot tables and conditional formatting options save time and simplify common spreadsheet tasks. IPadOS uses data detectors to recognize phone numbers, dates, and addresses, so you could, for example, write a phone number, then tap it and call it.Google Sheets makes your data pop with colorful charts and graphs. By continuing to use this website you consent to the use of cookies.You can write in the address bar of Safari, you can compose emails with your pencil, and you can use smart selection to select, cut, and paste text converted from your handwriting. When you sell or donate a Mac or give it to a family member, it’s best to make a clean break: wipe the puppy clean, reinstall the latest version of OS X, and hand off a system that you’re not worried has remnants of yourself on it.This website uses cookies to improve your experience and to personalise our content to you.Government security guidelines.Securely erase your hard drive with Disk Utility.Before Lion, you had to boot from a CD or DVD system disk or a third-party utility, like Disk Warrior, or from an external drive with OS X installed. Once is considered enough for regular purposes, while three and seven correspond to different U.S. When you select a volume in Disk Utility and then the Erase tab, you can click Security Options to pick how many times the drive is overwritten: once, three times, or seven times. That’s been built into Apple’s Disk Utility for years. But it doesn’t make all the files on the disk unrecoverable—it just makes them harder to retrieve.To get rid of old data in a thorough fashion, you need use a multi-pass approach, in which every bit of storage in the disk is overwritten with new data (often zeroes). Such an erase was, in practice, the best way to create a clean installation. Windows emulator for mac graphAfter you boot, launch Disk Utility, select the startup volume, and click the Erase tab. First, erase a drive without the overwriting part, and reinstall OS X. Select Disk Utility from the startup menu, and you can erase your startup drive securely.You’ll save a little time if you do an erase without overwriting, then reinstall OS X, then Erase Free Space with an overwriting option.There’s a slightly different way to accomplish the same goal. Restart a Mac and hold down Command-R after the startup chime sounds, and the computer boots into the recovery mode. But this has become easier since OS X Recovery was added in Lion. Download doom 1 for macThis will speed up the operation by encrypting the new computer’s fewer files first. Because FileVault encrypts an entire drive and only decrypts files when you’re logged in, it has no effect on how or whether you make a clone, use Migration Assistant, or copy files.However, if you’re planning on using FileVault on the new computer, I would heavily suggest enabling FileVault on the new machine before moving any files to it. Without the key, which is uncrackable in any realistic period of time by any current technology, the erased data is as good as gone as if it had been written over millions of times.You can then install OS X on that partition, either from the recovery system or via an external drive.A few other recovery and FileVault issuesReader Peter wondered how FileVault figures in to cloning a disk. The advantage is that your computer remains available (though often slow) while this operation is underway.Along with both Secure Erase and the Erase Free Space options, which can take a very, very long time even for a single pass, you’ve got two other options, one of which you don’t need to enable.Erasing a FileVault-encrypted volume discards the key that’s associated with it, turning a disk into a nearly perfect cacophony of irrecoverable randomness. ![]() For that, turn to AppleCare, an Apple Store Genius Bar, or the Apple Support Communities. (We’ll be experimenting with some audio in the future, and may put your question “on the air.”)Mac 911 can’t provide direct email responses or answers for every question. If correct, Apple’s customer service gains access to the stored key, which they provide to you.We’re always looking for problems to solve! Email us at tweet them at me (if brief) or call 20 and leave a voicemail message.
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