Erase mac hard drive no disk

Remember that when you format a drive, it won't show the exact same amount of free space as it does on the box. This is because computers measure space differently than they are marketed , so you'll never get that exact same number, at least on Windows. When you're done, click on the drive in Finder.


  • Mac 911: How to erase your Mac's hard drive the right way;
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  • How to Securely Erase an SSD Without Damaging the Drive - Macfixit Australia Blog.

You can start dragging files to it, or set it up as a backup drive with Time Machine. If you want to erase your computer's main hard drive, things get a little more complicated. You obviously can't erase the drive while you're using it, so you'll need to format from a bootable CD or USB drive. What tools you use depend on what you're trying to do. If you're going to sell your computer or the hard drive, you'll want to securely wipe it using these instructions beforehand.

After you've done so, you can reinstall your operating system if necessary as described below. If you just want to reinstall your operating system or install a new one , the installer can do the formatting for you.


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  • Why to erase a disk.

Just insert your Windows, OS X, or Linux installation disc or drive , boot from it , and enter the installation. If you're installing OS X or Linux, you usually just need to choose the option to install from scratch, which will erase your drive.

Disk Wiper 15 for Mac OS X Free

In the Windows installer, wait until you get to the screen with a list of your drives. Make sure you've backed everything up before you reinstall! Wups Honorable. Oct 14, 13 0 10, 0.

Accidentally Erased Hard Drive Using Disk Utility

Boot into the Recovery on the bootable drive and you'll then be able to erase the disk. That is the only way you'll be able to as you're booting off of that Hard Drive already. Wups :. That means you don't have a recovery partition. It will erase the disk anyway when you install the new OS X.

Macbook won't let me unmount drive in order to erase it?

Retrowire :. You must log in or register to reply here. Im using a MacBook Pro on Mojave. Question Macbook pro or macbook air? Post thread. Laptop Tech Support. Started by Misha Jul 24, Replies: 4. Android Tablets. Set-Top Boxes. Smart Home. Apps General Discussion. Moderators online. Top Bottom. Aug 8, Question How do I delete all the caches I can and not lose my browser bookmarks?

How to force a Hard Drive to unmount for formatting in Mac OS X Disk Utility

Question Which MacBook Pro - or Jul 19, Jul 18, The procedure will take quite a long time; typically for a 40GB Hard Drive it may take up to 36 hours to complete. The individual who cleared the hard drive should fill out the certification form for asset disposal. To enhance day-to-day security, there is also the option with OS X That is to say to overwrite a file in a secure way rather than just remove it from the contents table.

This is a considerably more secure way to remove data on a day-to-day basis but is not a substitute for securely formatting a hard drive. Secure Empty Trash is located in the Finder menu and it is only selectable when there are items in the Trash.

3 Ways to Securely Wipe an External Hard Drive Clean on Mac

This item can take a number of minutes to complete depending upon the number and size of files being trashed. Permanet Eraser This carries out the same function as Secure Empty Trash and likewise the data is not recoverable once it has been erased. There are a number of third party utilities which can perform this function.

Some are listed here.