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I have an macbook air late 2008 running osx El capitan and I wanted to erase my driver and reinstall the macos. So first i booted into recovery mode and tried formating my hard dive in disk utility but then I got an error "MediaKit reports not enough space on device for requested operation" then again I tried the same thing for 3 times and it still showed me the same error. Then I tried formating the drive in terminal but I still get the same error. I tried searching the net and found solutions only for external drive and found no solution for a internal one. So pls tell me a solution to erase and reinstall the os in my mac.

Note: I am trying to reinstall the OS on the primary internal disk that is disk0.

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You need to boot from another disk and run disk utility and install from that drive.

You cannot boot from a disk that you want to erase or partition or re-install the system on.

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