#Mac os installation disk how to#
#Mac os installation disk download#

If you choose three or five passes, you might want to leave this running overnight. If you opted to wipe your drive securely, this might take a while-30 minutes to an hour is not unreasonable for one pass. Just give your drive a name (I recommend вЂњMacintosh HDвЂќ, just for consistencyвЂ™s sake), then click вЂњEraseвЂќ to start the overwriting process. You only need to write over a drive once to securely wipe it, but if youвЂ™re paranoid you can also wipe it three or five times.Д¬lick вЂњOKвЂќ once youвЂ™ve decided, but remember:В if your Mac has a solid state drive, you do not need to use these options. Now move the dial up, to randomly write data over your entire drive. You still need to wipe the drive, however,В or your files will remain in place, so skip to the end of this step to do so.) (If your Mac has a solid state drive, you can skip this part: your SSD will already securely eraseВ files thanks toВ TRIM. If youвЂ™re wiping a mechanical drive, click вЂњSecurity OptionsвЂќ in the window that pops up. Click your primary drive, then click вЂњEraseвЂќ If not you can find Disk Utility in the menu bar: click Utilities then Disk Utility. To get started, click the Disk Utility option.Дepending on how you started Recovery Mode, you may be presented with the option to start Disk Utility right away, as seen above.

#Mac os installation disk how to#

WeвЂ™ve shown you how to securely wipe a hard drive with your Mac, and doing so in Recovery Mode isnвЂ™t really different from doing so within macOS. IfВ you want a truly clean installation, however, you need to first wipeВ your hard drive. We recommend backing up files before you do this, just in case, but otherwise youвЂ™re ready for step three. Your user accounts and files will stay exactly where they are-only your operating system will be overwritten. If you want to re-install your operating system, but leave your files in place, you can skip this step. RELATED: 8 Mac System Features You Can Access in Recovery Mode Step Two: Securely Wipe Your Hard Drive (Optional) Once youвЂ™ve managed to open up the Recovery Mode in some fashion, we can move on to wiping your drive securely.

#Mac os installation disk download#

You can access recovery without a partition using Network Recovery: hold Command+Shift+R while turning on your Mac and it will download the Recovery features for you.В Failing that, you can create a bootable USB installer for macOS Sierra, and boot from that by holding вЂњOptionвЂќ while turning on your Mac. If neither of these options work, donвЂ™t panic! YouвЂ™ve got a couple of options yet.