How do I boot from an external CD drive?

On a different thread, I've been reporting problems with my internal HD.
When I went to Disk Utility and ran Verify Disk on the HD, I got the error back telling me that the Mac HD needs repairing. Now, to run the repair facility, I seem to have to reboot from the OS X CD rather than the Mac HD.
Trouble is, my internal optical drive failed some time ago (seems to be a known fault with iMacs that have the MATSHITADVD-R UJ-846 optical drive) and I've been using an external optical drive connected via firewire with no problems...until now. When I went to reboot from the CD (holding the C button down whilst selecting Reboot), my Mac just booted again from the internal HD.
How do I reboot from an external CD?
If I can do this, I can run the disk repair utility and hopefully all will then be well...
(Please spell out any suggestions for me as I am really quite new to all this stuff - Thanks!)

Hi Chris.
What is the version of the OS on the computer and what is the version of the OS Disc that you have inserted?
Make sure you have inserted the same version of the OS disc that is currently running on the computer.
For Example. If there is 10.5.x running on your computer, you have to insert 10.5 Disc and boot to it.
Cheers,
Gop's.

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How do I boot from an external hard drive if my MacBook Pro only recognizes the internal drive?

Hi there, I recently got the white screen of death (w/ circle slash) on my 13" 2009 MacBook Pro. Most people are saying that it is hard drive failure, so I am trying to boot it from an external hard drive to save some of my data before having it repaired. Unfortunately, every time I press "option" while it boots, it only shows the internal drive on the grey screen. I have my external drive connected, but it won't recognize it. What should I do?
Thanks!

Welcome to the Apple Support Communities
You can only start from an external drive if OS X is installed there. If not, it won't appear as a bootable volume because there isn't any operating system inside it.
As you have a Mid 2009 MacBook Pro, it's better to start from the Mac OS X disc that came with your Mac. Insert it and hold the C key while your Mac is starting. After starting, go to Utilities menu > Disk Utility, select "Macintosh HD" in the sidebar and repair it. If you can't get it repaired, take the computer to an Apple Store.
If the hard drive can't be repaired, the only option to recover your files is to use an application as DiskWarrior, but it's expensive and it's not sure that it will work, because it may fail

How do I boot from an external hard drive?

I have a MacBook Intel. I attached a USB hard drive and made a partition for an system image and another for Time Machine. I did a system Restore to the Image partition. I would like to test it to see if I can back up to it. Is there a key or something that I have to hold down to be able to choose which disk to boot from (internal or external)?
also, I created the system image for the external hard drive by using the Restore command with the source as my current hard drive and the output as the external partition. There did not seem to be any other options. Is there something else I should have done?
The drive is formatted as Mac OS Extended (Journaled) and I chose the Intel set up (GUID ?).
The OS is Leopard

Is there a key or something that I have to hold down to be able to choose which disk to boot from (internal or external)?
Hold the "Option" key when booting.

How do you boot from an external hard drive if...

Thanks in advance to anyone who can offer any advice. My 24" IMAC suddenly had hard drive ****. After much investigation it has been determined that my internal hard drive has bit the dust. Instead of taking the IMAC apart and replacing the internal drive(which I know a bit about and also could get help doing)can I just replace it with an external drive and load the OS on that and boot from there? If so what exactly, step by step, would I need to do? What are the disadvantages of doing this? If this is possible it seems like an easier solution than replacing the internal drive.
Again, thanks for the help.
Bill

easybpw wrote:
can I just replace it with an external drive and load the OS on that and boot from there?
Yes, but it's not recommended for long-term use.
If so what exactly, step by step, would I need to do?
First, make sure the drive will boot a Mac. Most will, but some won't. If it's a Western Digital, check here: http://wdc.custhelp.com/cgi-bin/wdc.cfg/php/enduser/stdadp.php?pfaqid=1787. But note the disclaimer that they don't support it +*at all.+*
If you're reasonably sure the drive is capable of booting your Mac, you need to format it. Start up your Mac from the Install disc (insert it, and hold the "C" key while starting up). After selecting your language, select Utilities, then +Disk Utility+ from the menubar.
Select the drive, select the top line (with the make and size), click the Partition tab and select 1 Partition from the the pop-up menu under +Volume Scheme,+ unless you need more than one.
Give it a name under +Volume Information,+ and select +Mac OS Extended (Journaled)+ for the Format unless you're certain you need Mac OS Extended (Case-sensitive, journaled). Click the Options button below the box, and select GUID (that should be the default, but make sure), and click the OK button, then Apply. That should only take a few moments. Quit Disk Utility and you’ll see the Utilities menu again.
Quit that and proceed with the installation to the new drive. When done, I think it will reboot automatically from the external; if not, start up while holding down the Option key, which will give you the +Startup Manager,+ where you can select the desired drive.

How do I boot from an external drive?

I've just Carbon Cloned my 60GB drive to a firewire external drive. I'm about to replace the 60GB with a 160GB drive and the CCC instructions say boot from the external drive I'd just created once the new disk is installed. Then CCC the cloned drive back to the new hard drive.
So, how do I boot from an external drive? Do I have load anything to the new drive? Will the macbook detect the external drive and boot from that? Or what??????
Thanks
Dick

Thanks DWB. Being the rash impetuous guy I am I didn't wait for replies and just switched on the macbook after installing the new disk (which was so easy it was unbelievable - had to go and buy a a little torx bit though) to see what would happen.
Blow me down with a feather if it didn't just boot off the external drive all by itself :-O It did come up with the disk was unverified and I could see it in FINDER and I was prseented with a screen to ERASE/RESTORE etc.
When I went to CCC the external drive back to the new hard drive it didn't give show me the new hard drive so I guessed I'd have to do something to format (?) the hard drive.
I don't know if I did the right thing but I went to disk utilities and chose ERASE in the vague hope it would maybe format the disk in some way.
Seems to work now and the CCC replaced the system perfectly as far as I can see.
Basically very impressive all round. Piece of proverbial to replace the disk and CCC made life so easy.
Thanks again.
Cheers
Dick

BOOT FROM AN EXTERNAL USB DRIVE???

I know apple has made it clear about booting from an external USB drive
http://docs.info.apple.com/article.html?artnum=106474
but I know that there are people who are able to boot from an external drive, does anybody know how to do this?
It's just that id like to work on final cut studio on an external drive for various reasons:
1st: my powerbook's HD is small and slow (60gb)
2nd: my external usb drive is big (160 gb) and fast (7200 RMPS!)
so a little help would be apreciated
best regards

"Actually, USB II is faster than FW 400."
In theory, probably. In real life Firewire 400 is much faster than USB2, not to speak of Firewire 800:
"Wee Wiebetech" Portable FireWire/USB2 Drive Challenges The Fastest Competitors.

My Macbook air flash had gone for a month and I saw Apple's Macbook air flash storage drive replacement program. I'm not sure whether that program is still available for the broken device or not. Now, I'm booting from the external hard drive. Thank you.

My Macbook air flash had gone for a month and I saw Apple's Macbook air flash storage drive replacement program. I'm not sure whether that program is still available for the broken device or not. Now, I'm booting from the external hard drive. Warranty has gone in October 2013..
I want to send back my macbook air back to apple store. The problem is that I bought it from US and now, I'm using it in Myanmar. If the program is free of charge for my device, it's worth trying to send back to US. Since mine is broken, I'm afraid Apple will take charges for reparing.
So, if anyone having the same problem as me, I would like to get suggestion....
Thank you!!

I have no idea about how to handle the international aspect of your question.
But here is the Apple writeup about the problem and the remedy. Maybe that will help you.
http://www.apple.com/support/macbookair-flashdrive/

Booting from an external DVD drive

I have a 2006 Intel iMac with a Samsung model SE-208 USB DVD drive attached to it. How can I boot from this drive instead of using the internal DVD drive.

Everytime I try to load a DVD-RW disk, it gets stuck in the drive. That's why I am trying to boot from the external DVD drive. When I try to boot from the external DVD drive, it doesn't even show up when I press the option key on startup.
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All of my DVD-RW's mount on the desktop no problem from the external USB burner.

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How do I boot from an alternate hard drive?

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How can I boot images on external hard drives with an older OS

Hi,
I recently bought a new MacBook Pro Retina (running OS 10.9.2 Mavericks), because I had to give back my „old“ one (bought in February 2013, running OS 10.8 Mountain Lion), which was only a loan from University.
So here comes my problem: I used Carbon Copy Cloner to create bootable images of my old MacBook on two independent hard drives. I tested these images and they both booted perfectly well on the old MacBook. As it turns out, I cannot boot from these images on my new MacBook Pro, I just get a crossed grey circle (both images work perfectly well when I boot from my internal hard drive and I just use them as external drive, by the way). Is it really correct, that it is not possible to boot a system with an older OS as the OS of the MacBook? Why? I really would like to have the option of booting these images, since I have some applications installed I might want to use from time to time in the future (and I don’t want to migrate all applications to my new MacBook, but prefer a clean install). As I understand, it would be necessary to update the images to Mavericks. But how do I do this when I have no computer which is able to boot them?
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Thanks!

Hi!
Thanks for your prompt response. The reason I don't want to migrate all apps is that I had installed a lot of scientific applications on the Mt-Lion MacBook that I will definitely not use in the future, some that I might use only very rarely, and I can migrate only the complete applications folder (and I have only a 256 GB hard drive). Of course I could deinstall the unused apps manually after the migration, but I am not 100% sure, if this procedure completely removes all the stuff from the libraries and preferences, etc. Moreover I also started playing with some time ago with server applications like apache server etc. and since I am a complete newbie in this field, I have to admit, I really don't know how to uninstall these things properly. So I figured a clean install for the new MacBook would be the best. Well, maybe I will migrate everything and remove the unnecessary stuff afterwards manually. I am just a bit disappointed, because I didn't anticipate these problems with the images...
Just one further question: Is it correct, that if I find a way to update my images from Mt-Lion to Mavericks (if that is possible at all?), this would make them bootable again?
Thanks!

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bamim2,
you obviously just cracked some known hardware restrictions that not even Apple knew how to do: Don't start up from an external USB device.
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How do I boot from an external CD drive?

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