![]() Disk Utility is the first tool you should utilize when it comes to formatting any HHD on your Mac.Recent Videos from Recoverit View More > 4. Reformatting your drive will get rid of your files, of course, but it also gets rid of any errors. It can also mean putting the same file system in the drive to fix it if it's faulty. You can think of reformatting your drive as a way to reset it by putting a new file system into the drive to supplant the old one. This is also where you give the drive a name.Ĭ) Go back to "Disk Utility" and select "Install macOS". If you're prompted, choose "macOS Extended (Journaled)" or any of the other file systems based on your needs or preference. The "Utilities" window will then show up.ī) Click on "Erase" to format the new hard disk. Let go of the keys once the Apple logo or spinning globe comes on. There are different file systems, as you'll soon find out, and each has unique features that some of the other file systems may or may not have.Ī) Startup your Mac and press the "Option"+ "⌘" + "R" keys to boot into "Recovery". How to Format New Hard Diskįormatting a new disk, in the simplest of terms, means setting up a file system in the new drive to work with your macOS. No one needs to tell you formatting your Mac's drive entails reinstalling the macOS afterward, right? As long as you're aware of that, you're good to go. Apple has given you several options to choose from should you ever need to format or reformat your drive. The simple reason you might want to completely wipe your Mac's internal drive is that it has encountered one serious error or another. Part 4: How to Fix Errors When Formatting Mac Hard Drive.Part 3: Different Formats of Mac Hard Drive.Part 2: When You Need to Format Disk on Mac.sudo hdparm -user-master u -security-disable Eins /dev/sdXĮither of these two options should allow macOS Disk Utility to see the SSD again. If the secure erase fails, then you will need to manually disable the security mode or the SSD will be locked upon the SSD being power cycled. ![]() If the ATA Secure Erase is successful, it will disable the security mode which was set earlier. Not all SSDs have the built-in hardware secure erase feature. The ATA Secure Erase typically takes between 30 seconds to a few minutes usually, although it can be longer with some SSDs. Then perform the actual ATA Secure Erase: sudo hdparm -user-master u -security-erase Eins /dev/sdX Once the SSD is "not frozen", you can proceed to enable ATA Security: sudo hdparm -user-master u -security-set-pass Eins /dev/sdX If the SSD is "frozen", then you need to put the computer to sleep and wake it up. Basically you need to check the status of the SSD to make sure it is not "frozen". You will need to install the "hdparm" tool if it isn't already installed. ![]() An ATA Secure Erase can be performed from Linux using the instructions here: This will reset to the SSD to factory defaults and erase every block on the SSD. sudo dd if=/dev/zero of=/dev/sdX bs=100M count=10Įven better would be to use the ATA Secure Erase function which is a built-in hardware function of many SSDs (even some Apple SSDs support this feature). In all of the examples, replace "sdX" with the actual Linux drive identifier for your SSD. If you can boot Linux, then you can erase the beginning of the SSD using "dd" to write zeroes to the beginning of the drive. I once even had a USB stick not seen by Disk Utility as described here with the SSD. Usually this occurs with USB sticks after "burning" an. Sometimes I've found that certain things can block macOS Disk Utility from being able to erase the drive. There is a slim possibility that if you have a MBPro that the internal hard drive cable is defective and for some reason is keeping macOS from seeing the SSD even though it seems to be fine with Linux. Try an SMC reset and a PRAM reset (hold the PRAM reset for a full minute so it activates several times).
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