Format a Hard Drive

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I am trying to reformat the hard drive of my 2007 iMac in order to donate it and am having a tough time figuring out how to do it. I have tried the disk utility program but it won't allow me to erase the hard drive. Any thoughts?
 

pigoo3

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2017 15" MBP, 16gig ram, 1TB SSD, OS 10.15
I am trying to reformat the hard drive of my 2007 iMac in order to donate it and am having a tough time figuring out how to do it. I have tried the disk utility program but it won't allow me to erase the hard drive. Any thoughts?

What OS version is the computer running?

- Nick
 
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Silver M1 iMac 512/16/8/8 macOS 11.6
What OS are you running?

Either boot from the install DVD and go to Utilities > Disk utility > Erase, or similar in Recovery in OS X.7 or later. You cannot erase or repair a disk you are booted from.
 

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