How to install OS X on a new or faulty HD without Internet recovery. Corrupt and new disks might not have a working Recovery partition, but there are still ways to access one and reinstall OS X. If you download the El Capitan installer to your existing El Cap partition, you can run the installer and install El Cap on the 'Macintosh HD' partition. You should be able to expand the existing El Cap to the full size of the disk, basically wiping out the Macintosh HD partition. But Disk Utility may have some quirks in how it. When finished, OS X El Capitan will boot into a brand new clean install, running through the initial OS X setup process on the Mac as if the Mac was brand new. No files, no data, nothing will be on the Mac except for what comes with OS X El Capitan, that is what a clean install is for. Aug 27, 2021 If the installer doesn't see your disk, or it says that it can't install on your computer or volume, you might need to erase your disk first. If the installer offers you the choice between installing on Macintosh HD or Macintosh HD - Data, choose Macintosh HD. Allow installation to complete without putting your Mac to sleep or closing its lid.

“This copy of the Install OS X Mavericks application can’t be verified. It may have been corrupted or tampered with during downloading”

The reason why this insane message is happening is because as of February 2016, the security certificates that validate these Mac OS X installs seems to have expired. What this means is that when you try to install Mac OS X Mavericks, Yosemite or El Capitan from any USB or external source, the certificate checking process will render your copy of the installer null and void. You will then get the error “This copy of the Install OS X Mavericks application can’t be verified. It may have been corrupted or tampered with during downloading.”

Thankfully, as annoying as this is, there’s a pretty easy fix in the Terminal, located on every installer of Mac OS X. Here’s what to do:

1. Boot into the OS X installer as you would normally do (hold down option at boot and choose your installer
2. Disconnect the ethernet cable if it’s connected and turn off wi-fi from the networking menu
3. Open the utilities menu item and choose “Terminal”
4. When the Terminal appears, simply type in the following command: date 0202020216
5. Hit return and you will now see the new date as read back by the system
6. Quit the Terminal
7. You can now begin to reinstall OS X from the main screen as you did before

Os X El Capitan Cannot Be Installed On Macintosh Hdd

Why does this work in the Mac OS X Terminal?

The reason why this works is that you are actually turning your computer into a time machine–and you are telling it to go back to the date February 2nd, 2016. This tricks the certificate into believing that the date is now in the past and allows the installation to resume. You can also redownload any installers to get the new certificates, which are located in your purchase history on the Mac App Store. You would then have to make new installer disks with these new downloaded installers.

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