Model A1312 / Mid 2010 / 3.2 GHz Core i3 or 2.8 & 3.6 GHz Core i5 or 2.93 GHz Core i7

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How to eject my external drive I am currently booting from?

I am soon to be replacing my hard drive in my mac after it died. In the mean time, I downloaded Yosemite on an external drive and booting up from that. (all my backup data is on a separate drive btw).

But when it comes time to install the new internal drive, do I need to "eject" my external drive that I am booting from? Is that even possible?

Or would it be safe to just shut down my computer and then unplug the external drive from the computer?

Seems unsafe that I wont be able to somehow eject it before taking the USB out. Or, I could restart the computer, holding down Option - tell my mac to stop booting from ext drive and boot from dead drive. Then restart and hold down command+R, go into disk utility and unmount the external disk I was booting from. Would that be safe for the ext drive? Then shut down - and get to installing the new internal drive! :)

P.S. I am not able to boot from my failing hard-drive, I cant get past the apple logo loading screen, just fyi.

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You need to have a working bootable drive to run your system. So right now your external drive is it! So disconnecting it doesn't help you yet.

Using your external drive have you tried using Disk Utility to try to repair the drive and if needed re-install the OS? If you have and its just not working then you'll need a new HD drive.

So the first thing here is we need to find out who's drive you currently have as you do need to replace it with the same supplier unless you replace the thermal sensor cable as well. Can you run either the System Profiler or Disk Utility so you can see the specs of the internal drive. If you can give us the drive model info.

If you can't get the info you either need to open the system up to look at the drive your self (at this point you'll need power the system down and disconnect everything). Do you have the needed tools? Are you up to the task? Review this IFIXIT guide: iMac Intel 27" EMC 2390 Hard Drive Replacement. IF you've never opened up a mac or computer this maybe a bit much for you. If it is you may want to find a local Apple Authorized service center or Apple Store to let them do it.

OK, you're going for it!

Make sure you have the needed tools and I do strongly recommend getting a antistatic mat and wrist strap which has been properly grounded as you don't want to zap your system as you work on it.

Once you pull out your current drive give us the make and model. Once we have it we can go onto what to buy. Good Luck!

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Thanks, but actually I already know all about replacing my internal hard drive, it's totally dead, and I ordered a new one, with the right brand and everything, planning to install it in a couple days. I know what I will have to do to install it correctly. That I don't need any further help on.

All I want to know is how to properly eject my current external drive that I am booting from, so I don't corrupt any of the data on that. All it has on it, is some data movies, pictures stuff like that and Yosemite. That being said, if you go up to my original question and start at the "But when it comes time to install the new internal drive..." and read on from there, if the process I describe for safely ejecting my bootable drive sounds correct, let me know!

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Just shut down your system and disconnect the drive physically.

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anne will be eternally grateful.
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