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Simply moving files to the Trash doesn’t fully clear your Mac\u2019s drive, as someone else could still bring those files back with a recovery tool. When you securely erase a hard drive on a Mac, that data is effectively unrecoverable. That makes it the right step when you\u2019re preparing a drive to pass along, setting it up for a new purpose, or clearing out old hardware.<\/p>\n
The exact process depends on the drive you have, whether that\u2019s your Mac’s built-in storage, an external hard disk drive (HDD), or a solid-state drive (SSD). Before starting, take a quick moment to double-check that you\u2019ve selected the right drive or partition, just to protect anything you want to keep.<\/p>\n
This guide walks you through how to securely erase the hard drive on your Mac, and what to do if you plan to give away, sell, or trade in the computer.<\/p>\n
Different drives require different steps. Pick the wrong method and you could end up erasing the wrong thing, or with a drive that isn’t fully wiped. Here’s the short version:<\/p>\n
Your Mac\u2019s internal drive is the main storage inside your Mac that holds your operating system and personal files. How you erase it depends on the age of your Mac and the chip inside it. Before you begin, make sure you back up anything important using Time Machine<\/a> or another storage method.<\/p>\n If your Mac has Apple silicon or the Apple T2 Security Chip and runs macOS Monterey 12 or later, use Apple\u2019s Erase Assistant. For the complete sale, trade-in, donation, or recycling workflow, see how to securely dispose of your old Mac<\/a>.<\/p>\n If Erase Assistant isn\u2019t available, start the Mac in macOS Recovery and erase the startup disk with Disk Utility:<\/p>\n Here\u2019s how to use Disk Utility after opening it in recovery mode:<\/p>\n To set up your Mac again using the freshly erased disk, select Reinstall macOS<\/strong> from the options on screen, click Continue<\/strong>, and follow the steps as they appear.<\/p>\n If your Mac has an SSD, you won’t see Security Options<\/strong>. If you want extra security before wiping an SSD, encrypt the drive<\/a> beforehand so your data remains unreadable without the encryption key.<\/p>\n Before you begin, double-check that you plugged in the correct drive and that any files you want to keep are backed up somewhere else. Follow these steps:<\/p>\n When you erase an external HDD in Disk Utility, you may see a Security Options button in the erase dialog. Clicking it reveals a slider with a few settings. At the fastest end, the drive is erased quickly but the old data isn’t written over, so a recovery tool could still bring it back. As you move the slider to the right, Disk Utility writes over the data, and the higher settings do it several times.<\/p>\n These options aren’t available for every storage device, so if you don’t see the button at all, it doesn\u2019t mean something’s wrong.<\/p>\n Each extra pass overwrites the drive again, making original data much harder to recover, though each pass adds significant time to the process.<\/p>\n It\u2019s easy to think that picking maximum passes is the sensible default, but most people don’t need to go that far. If you\u2019re handing the drive off to someone else or setting it up for a new project, a single overwrite pass is usually sufficient for ordinary reuse. Just avoid leaving it on the fastest setting, since that one doesn’t write over your data.<\/p>\n Those extra passes are really there for times when strict privacy guidelines or sensitive data demand an extra layer of caution.<\/p>\n Disk Utility doesn\u2019t provide Security Options for SSDs, and that’s not a bug or a missing feature on your end. The reason has to do with how SSDs store data.<\/p>\n Traditional hard drives write to fixed physical locations, which is what makes overwriting them meaningful.<\/p>\n SSDs manage data differently, spreading and moving it across memory cells in ways that make repeated overwriting an unreliable way to guarantee the original data is gone. So Disk Utility doesn’t offer it as an option here.<\/p>\n Erasing an SSD multiple times or trying to force a multi-pass wipe won’t give you the same security as overwriting an HDD. If you want to keep the contents of an SSD or flash drive out of reach, encryption is the way to do it.<\/p>\n Disk Utility can’t overwrite an SSD the same way it does an HDD, which makes encryption essential for keeping your files private. When a drive is encrypted, anything left behind after an erase remains scrambled and useless without the decryption key or password.<\/p>\n Keep in mind that encrypting a drive later on won’t protect files you deleted while protection was turned off. This means specialized recovery software might still be able to read those older files. The simplest approach is to turn encryption on as soon as you plug the drive in for the first time.<\/p>\n Use FileVault to encrypt your Mac\u2019s internal SSD<\/a>. When it’s turned on, everything written to your startup disk is encrypted, so even if someone got hold of your Mac, the data would be unreadable without your password or recovery key.<\/p>\n Here\u2019s how to turn on FileVault:<\/p>\n On Macs with Apple silicon or the T2 Security Chip, data is already encrypted automatically; FileVault adds protection by requiring an authorized login password to access it. On older Intel Macs, initial encryption may take time, but you can continue using the Mac while it finishes.<\/p>\n For external SSDs and flash drives, you may be able to encrypt the drive straight from Finder. When you do this, the disk format is converted to the APFS format<\/a> and then encrypted, which protects it with a password while leaving your files in place. To encrypt a drive in Finder:<\/p>\n Depending on how much is already saved on the drive, the encryption process may take a little time. You can keep using your Mac normally while it finishes up.<\/p>\n If you don’t see the Encrypt [drive name]<\/strong> option in Finder, it might not be available for your drive or Mac. In that case, you can format and encrypt the disk using Disk Utility.<\/p>\n You can also encrypt an internal or external storage device while formatting it in Disk Utility. This protects the newly formatted device with a password. Select APFS (Encrypted) as the format when erasing the drive. For your Mac\u2019s active startup disk, use FileVault instead.<\/p>\n Preparing a Mac for a new owner involves more than erasing its drive. Follow our guide to securely dispose of your old Mac<\/a> for the complete sale, trade-in, donation, or recycling workflow, including the correct erase method, account sign-outs, Activation Lock, and final handoff steps.<\/p>\n Occasionally, a drive reaches a point where it won\u2019t show up on your Mac or respond to standard erase commands, yet the private files stored on it remain intact.<\/p>\n When this happens, don’t try to force the issue with physical destruction or improvised methods at home. That’s harder to do safely and thoroughly than it sounds, and it’s easy to end up with a drive that’s damaged but still partially readable.<\/p>\n A simpler and far more reliable option is to hand the drive over to a certified recycling or data-destruction service. They have the proper equipment to handle drives that can’t be erased through normal means, and to destroy the data in a way you can actually verify.<\/p>\n When you erase a drive in Disk Utility, you’ll be asked to choose a format. The best choice depends on what you need to store and which computers you will plug the drive into.<\/p>\n For Mac-only use, choose an APFS format. APFS is built for macOS 10.13 and later, and it comes in a few variations:<\/p>\n If you plan to move files back and forth between a Mac and a Windows PC, use one of these formats instead:<\/p>\n To erase an external hard drive (HDD)<\/a>, plug it into your Mac, open Disk Utility, and select the drive itself from the sidebar rather than one of the volumes under it. Click Erase, pick a format and scheme, and confirm. If you see a Security Options button, you can use it to overwrite the old data and make recovery impractical with ordinary recovery tools.<\/p>\n Security Options only shows up for certain storage devices<\/a>. If the option isn’t there, that’s expected for some drives. It doesn’t mean anything is wrong with your Mac or the drive.<\/p>\n Disk Utility doesn’t use overwrite passes on solid-state drives (SSDs) because they work differently than other storage devices. Instead, turn on encryption before you erase an SSD<\/a> or thumb drive.<\/p>\n Erasing a drive in Disk Utility is more thorough than deleting files or emptying the Trash. However, someone could still use advanced data recovery software to retrieve the old data if you didn\u2019t encrypt or write over it.<\/p>\n If the drive is only going to connect to modern Macs, choose APFS<\/a>. If you need to move files back and forth between a Mac and a Windows PC, pick MS-DOS (FAT) or ExFAT instead.<\/p>\n\n
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<\/li>\nHow to securely erase an external hard drive with Disk Utility<\/h2>\n
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<\/li>\nNote:<\/strong> Just like with internal SSDs, Disk Utility won\u2019t show you the Security Options to write over an external SSD multiple times. One way to protect the deleted data is to encrypt the drive<\/a> before erasing it. Ideally, do this before you start storing data on the SSD. Any data you delete before encryption won\u2019t be protected, so it\u2019s important to enable encryption from the start.<\/div>\nSecure erase options for HDDs<\/h2>\n
Why Security Options is missing on SSDs<\/h2>\n
Using encryption for SSDs and flash drives<\/h2>\n
For Mac internal SSDs<\/h3>\n
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For external SSDs and flash drives<\/h3>\n
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For both internal and external drives<\/h3>\n
How to erase a Mac before you sell, trade, or recycle it<\/h2>\n
What to do if you can\u2019t erase a drive<\/h2>\n
Choosing a file system after erasing<\/h2>\n
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Frequently asked questions<\/h2>\n
How do I erase an external hard drive on Mac?<\/h3>\n
Why is Security Options missing in Disk Utility?<\/h3>\n
Can you securely erase an SSD on Mac?<\/h3>\n
Does Disk Utility erase everything?<\/h3>\n
Should I use APFS or ExFAT after erasing a drive?<\/h3>\n
How do I wipe a Mac before selling it?<\/h3>\n