Trouble Booting from External Drives - MBA 2012

Hello,
I have a brand new 13" MBA which I'm working on building an image to use for deployment using Carbon Copy Cloner 3.4.5. For whatever reason, I can't boot the new 2012 MBA from an external LaCie FW800 or Thunderbolt 1TB Little Big Disk that is running either 10.7.2 or 10.7.4. As soon as I select the drive to boot from when holding the Options key or from selecting the partition from Startup Disk in System Preferences, I get the do not enter icon(circle with the diagonal slash). I tried both plugged in through a Cinema Display and plugging the Thunderbolt drive directly to the laptop. I confirmed both LaCie drives boot properly on an iMac and the last gen MBP/MBA.
Laptop Specs:
13"
1.8GHz Dual-core i5
8GB
128 SSD
10.7.4
Curious if anyone has run into any problems booting from external drives on the new 2012 MBA.
Thanks,
Paolo

Please be sure you have prepped these external drives correctly:
Drive Preparation
1. Open Disk Utility in your Utilities folder.
2. After DU loads select your hard drive (this is the entry with the mfgr.'s ID and size) from the left side list. Click on the Partition tab in the DU main window.
3. Under the Volume Scheme heading set the number of partitions from the drop down menu to one. Click on the Options button, set the partition scheme to GUID then click on the OK button. Set the format type to Mac OS Extended (Journaled.) Click on the Partition button and wait until the process has completed.
4. Select the volume you just created (this is the sub-entry under the drive entry) from the left side list. Click on the Erase tab in the DU main window.
5. Set the format type to Mac OS Extended (Journaled.) Click on the Security button, check the button for Zero Data and click on OK to return to the Erase window.
6. Click on the Erase button. The format process can take up to several hours depending upon the drive size.
My suggestion for cloning is to use Disk Utility. This will also automatically clone the Recovery HD, as well:
Clone Lion using Restore Option of Disk Utility
Boot to the Recovery HD:
Restart the computer and after the chime press and hold down the COMMAND and R keys until the menu screen appears. Alternatively, restart the computer and after the chime press and hold down the OPTION key until the boot manager screen appears. Select the Recovery HD and click on the downward pointing arrow button.
Select Disk Utility from the main menu then press the Continue button.
Select the destination volume from the left side list.
Click on the Restore tab in the DU main window.
Check the box labeled Erase destination.
Select the destination volume from the left side list and drag it to the Destination entry field.
Select the source volume from the left side list and drag it to the Source entry field.
Double-check you got it right, then click on the Restore button.
Destination means the external backup drive. Source means the internal startup drive.

Similar Messages

Trouble Booting from External Drives; Trying to Defragment from External

I have a Verbatim External Firewire 400/USB 2.0 hard drive that has Leopard installed on it. I have installed Drive Genius and Disk Warrior on the external drive. I boot holding the Option key and see the list of drives, and the External does appear. When I select it, the computer just reboots and loads the loads the internal hard drive. I'm trying to defragment the MacBook Pro from an external drive, but I can't do much if it won't boot from an external. I know with Intel Macs, you can boot from USB 2.0 and FireWire. Why won't it work? To be more advanced, I made a disc image of the MacBook Pro Restore DVD and restored it to a new partition of the external, thinking the operating system might be different in the new MacBook Pro because of the new settings in the System Preferences that control the glass trackpad. I'm stuck. Please help.

No, I would not recommend making a disc image. I would recommend cloning the drive to a freshly erased external drive. Cloning is not the same as making a disc image. Disc images cannot be used to boot the computer. They are large and unwieldy. They are intended to be burned to an optical disc and not used as a system backup.
Clones are exact file copies of everything on the source drive such that the destination drive is a mirror of the source drive. You can boot clones, you can update them, and you can access them directly just like any other drive.
How to Clone Using Restore Option of Disk Utility
1. Open Disk Utility from the Utilities folder.
2. Select the destination volume from the left side list.
3. Click on the Erase tab in the DU main window. Set the format type to Mac OS Extended (journaled, if available) and click on the Erase button. This step can be skipped if the destination has already been freshly erased.
4. Click on the Restore tab in the DU main window.
5. Select the destination volume from the left side list and drag it to the Destination entry field.
6. Select the source volume from the left side list and drag it to the Source entry field.
7. Double-check you got it right, then click on the Restore button.
Destination means the drive to which you will restore or backup.
Source means the drive you are restoring from or backing up.
There are many alternatives to using Disk Utilities Restore option. Any of the following can create clones as well as perform regular backups, and they can incrementally update a clone:
1. Retrospect Desktop (Commercial - not yet universal binary)
2. Synchronize! Pro X (Commercial)
3. Synk (Backup, Standard, or Pro)
4. Deja Vu (Shareware)
5. Carbon Copy Cloner (Donationware)
6. SuperDuper! (Commercial)
7. Intego Personal Backup (Commercial)
8. Data Backup (Commercial)
10. MimMac (Shareware)
11. SilverKeeper 2.0 (Freeware)

Problem booting from external drive

I'm having trouble booting my MacBook from an external USB drive.
I've created a bootable backup of my hard drive, using SuperDuper! (in order to be able to install a bigger hard drive and restore my current drive state). If, with the drive attached, I restart and hold down Alt (which I understand should offer a choice of drives from which to boot), I get nothing but grey screen (ie. the first grey you see before the apple logo comes up right at the start of startup). I have been able to boot from the external drive by changing Startup Disk settings, so I'm sure there's no problem with the external disk volume.
The drive is an Iomega 80GB USB 2.0 drive, and I'm running 10.4.10 on a 2GHz Core Duo MacBook.

Hey guys,
Thanks for the feedback... here's my update (still no joy):
• I'm not sure about the GUID table - how do I check? Does the fact that I can boot from the drive having selected it in my System Preferences mean that it is? It is definitely HFS+ formatted, however. (I gave bad information about the drive type, however - it's a Freecom 400GB, not Iomega 80GB, not that I suppose that makes a difference.)
• After holding that Alt key for a very long time, my MacBook did show me something other than a plain grey screen: a single, large, internal HD icon in the middle of the screen, above a vertical arrow icon. I take this to mean that the MacBook is recognising the internal HDD and no other volume. The external drive was still plugged into the USB port.
• The external drive is in fact partitioned as two volumes.

External Drive with Time Machine, booting from external drive with utilitie

I'm using Time Machine now with
a LaCie 1TB external hard drive.
Everything works fine.
But, I've been wondering:
Can I place a program like TechTool
on the external drive (that Time Machine uses)
and boot from that external drive.
I would like to be able to do that,
because diagnostics and repair programs
only works properly and fully when they run from
external drives. Anything on the internal drive can be repaired
and examine. Impossible to do if Techtool is on the same
drive that's been examined.
Any thoughts as to what I should do?
Thanks
iMac, Leopard, Time Machine, Lacie Quadra 1TB drive.
P.S. Stupid question: If my computer crashes, and I reboot from Time Machine
(from the external drive) how does the computer know which backup to take ?!?
Isn't there many versions of the OS on the Time Machine backup taken at different times?

pitou wrote:
P.S. Stupid question: If my computer crashes, and I reboot from Time Machine
(from the external drive) how does the computer know which backup to take ?!?
Isn't there many versions of the OS on the Time Machine backup taken at different times?
As V.K. says, you can't boot from TM backups.
But you can restore your entire system from any one of them, per the procedure in #14 of the Frequently Asked Questions *User Tip,* also at the top of this forum.
You can also selectively restore from them, while running normally. See #15 in the FAQ Tip.
You might want to review these:
Time Machine Tutorial
Time Machine 101
How to back up and restore your files
Time Machine Features
Apple - Support - Mac OSX v10.5 Leopard Time Machine
and perhaps browse the rest of the FAQ Tip.

Problems booting from external drives

Ever since I got this 6-core 2013 MacPro (January 2015), I have had strange problems and glitches, but for this posting, I am talking about problems being able to boot up from external drives. I took the 4 external drives out of my old 2009 MacPro and put them into a 4-bay Thunderbolt enclosure. This enclosure can be configured as a RAID if all drives are the same (which they are not) or it can just be a place to be able to access all 4 drives. I used to be able to boot from each of those drives on the older MacPro but I am unable to do so now. They show up in the System Preferences/Startup Disk but if I choose one, it just reboots into the new MacPro drive. I even tried pulling out a couple of the drives and mounting each into a USB 3.0 (Sabrent) dock and still I could not boot from those drives which have the latest version of Yosemite. Yes, they are formatted correctly. I used to boot from them. I was able to clone one of the drives to a Seagate USB 3.0 hard drive and boot from that. Although, the clone was not perfect. It didn't transfer all my settings so I could recover some logins and serial numbers I wanted that I have never been able to retrieve since I got this new Mac.
Yesterday, I formatted a 32GB flash drive and tried to install Yosemite on it. I planned to put DiskWarrior on it. When I started to install Yosemite (from a saved download) it let me choose that drive, but when it restarted before installing, I was right back where I started on my MacPro's hard drive.
Is this normal behavior for the 2013 MacPro? Or is it just mine? I am beginning to think I may have a lemon since I have had other strange problems that don't go away.

Not all external devices are bootable. First stop would be involve whoever handles the 4-bay Thunderbolt. Seeing how it has a bridge most likely in order to support RAID mode that may not have the correct frmware or other reasons.
https://bombich.com/kb/ccc4
https://bombich.com/kb/ccc4/search/bootable%20volume
CCC is the only program I would be using.

MacPro can't boot from external drive

Running 10.7.3 and a MacPro which gets backed up each night with SuperDuper. Can't boot from this drive (black screen). Yet I can take the same drive and start up my Macbook Pro! So it isn't the drive or the data on it. I'm stumped. Could this be related to an issue where I can't get this same MacPro or system to successfully backup to Time Machine without error? The boot drive seems OK (ran Disk Warrior and Disk Utility).

Please read this whole message before doing anything.
This procedure is a diagnostic test. It’s unlikely to solve your problem. Don’t be disappointed when you find that nothing has changed after you complete it.
The purpose of this exercise is to determine whether the problem is caused by third-party system modifications that load automatically at startup or login. Disconnect all wired peripherals except those needed for the test, and remove all aftermarket expansion cards. Boot in safe mode and log in to the account with the problem. The instructions provided by Apple are as follows:
Be sure your Mac is shut down.
Press the power button.
Immediately after you hear the startup tone, hold the Shift key. The Shift key should be held as soon as possible after the startup tone, but not before the tone.
Release the Shift key when you see the gray Apple icon and the progress indicator (looks like a spinning gear).
Safe mode is much slower to boot and run than normal, and some things won’t work at all, including wireless networking on certain Macs.
The login screen appears even if you usually log in automatically. You must know your login password in order to log in. If you’ve forgotten the password, you will need to reset it before you begin.
Test while in safe mode. Same problem(s)?
After testing, reboot as usual (i.e., not in safe mode.)

Trouble installation from external drive

I am having a massive problem as I was installing Tiger from an external DVD drive (USB) the installation went on okay, but when it needed to reboot it crashed and now I have a “grey monitor with an apple” and the system is absolutely dead!!
How can I recover as I can’t access my CD drive or for the matter of sake anything?
If/when I get recovered how can I get The Tiger installed?
I do have a full retail version but Tiger is not really making life easy.
If anybody have a hint it would be great!!!
G4 Imac 384mb 40G CD drive etc. Mac OS X (10.2.x) Ext. 80G HD, ext. DVD/CD W/R

Hmmm… is anything is better than getting a “you cannot do like that”? I really appreciate that one as that got me going and then installation was done as follows:
• Make sure the disk, a full retail version, is good and with no errors first –obviously- as during the installation this check is done and if you do not skip it you get stressed as it takes for ever and ever. Disk Utility will do that job.
• System Preference –Set the USB DVD drive with the Installation DVD as “startup disk”.
• Then close down you computer and start it with “OPTION” key down and select the Installation disc when it appears on the monitor.
• The installation does now start. (I selected a clean partition on my hard drive, so in case you get into trouble you have the old system -10.2.8
• Go through the normal installation steps but “skip” check DVD as said before.
• As iMAC G4 15” flat only have USB 1.1 you may go get a coffee or two as it will take quite some time approx. 1hour and 15 minutes.
• When the installation disc reboots the system you press “OPTION” and select the installation disc again. –Be patient-
• The installation is now finishing up and the final settings has to be completed as normal.
Conclusion:
Kappy I must disagree with you, but appreciate your comment as it got me going… and it is absolute possible to install Tiger from a external USB DVD you just need to be stubborn. And you can absolutely boot from a USB drive (SONY a cheap model)

Problems Booting from External Drive

I have a 2009 era Mac Mini (refurb) 2GHZ, 2GB RAM and 320GB internal hard drive and running Snow Leopard. I have been using a 1TB NewerTech miniStack V3 drive to boot from.
Last night the computer froze up while watching a show on Hulu.com. Nothing would respond so I had to shut it down with the power buttons. Now, when I boot from the NewerTech drive it boots but shows a blue background, the hard drive icons (Mac HD, NewerTech and Boot Camp) and the menu strip at the top. No dock, spotlight won't look up anything and trying to shut down through the Apple icon in the top left corner causes the whole screen to go solid blue, spinning beachball and then back but nothing opens or drops down to show choices. I can look in the hard drive icons but all the files show "0 bytes" and nothing can be done.
I can boot fine from the internal Mini drive and everything shows up that should. I can and have run various Disk Utility stuff on all the drives from there. No change when booting from the external:-(
I WAS able to boot from the external in Safe Mode which shows me that my files (over 300GB in iTunes alone!!) and applications are really still there!
I now have Drive Genius 3 at work along with the new NewerTech MiniStack I bought to do a clone backup (ironic isn't it?). No, I don't have a time machine backup either. I couldn't afford another drive until recently.
What has happened? It's like something has gone missing but I don't know what.
Thanks, AndyB, NH.

Well, I was afraid I'd have to do something like that. But I started it in Safe Mode (hold Shift down when restarting) and everything showed up like it should have (with whatever gets disabled by safe Mode). I ran repair permissions which I am sure did nothing else. When I got back this morning I restarted normally and everything was there. So I guess that fixed it.
I was really freaking and now have the other 1TB drive as a clone copy just in case something happens again.
Thanks, AndyB, NH.

MBP slow to boot and WILL NOT boot from external drive

I have two problems. First my friends MacBook Pro which is less than a month old is taking long to load. So I did a clean install without installing anything other than what came. Still slow to boot. Sometimes I see a light blue screen for a while before getting into the desktop. She complains of the beachball far too often. She says my MacBook is faster than her Pro, which is not right.
So I came down with my external LaCie drive, which I cloned from my iMac 24". I wasn't able to boot from the external (firewire) drive using her MacBook Pro. I thought my LaCie drive was bad or soemthing, but when I got home, I hooked it up to my MacBook and booted from the external drive just fine. I use SuperDuper to make a bootable clone.
So as it stands now, her computer is slow to boot into the OS, and it won't let me boot from my external drive. Does anyone have any idea what this could be? I did a clean install, used cocktail, etc. If it persists, I'll tell her to take it in.
Thanks,
Bryan

Robert,
I have no idea what you mean by Apple is not responsive to the issue. If you want help, please start a new topic thread so someone can help you identify the problem without the distraction of other people's problems around yours. Blaming people does not solve problems.
This is the link to post a new topic on this board:
http://discussions.apple.com/forum.jspa?forumID=1149&start=0
This is a user to user board. If you need help from Apple, call AppleCare directly here:
http://www.apple.com/contact/phone_contacts.html

Mac Mini Will not boot from external drive or install disk

Hi,
I just bought a new 2.0 ghz mac mini 1 gb ram. 120gb hdd.
I have a separate external HDD attached and wanted to boot from this. It works with my MBP and IMAC.
When i plug it into the Mac Mini and start up with Option key. It recognizes it.
I then click on it. It automatically reboots.... then grey screen comes on. It goes black after about 10 seconds. then boots into original operating system.
I also tried to use the MAC install Disk, thinking it might be a corruption in the shipped software. It does the same thing.
I have MAC Install DVD on an external drive too. Same issue.
I partitioned the HDD and installed a copy of the Mac install disk onto that with disk utility... Same thing grey screen, then black then back to original operating system.
Not sure what is going on?
thanks
Chris

Hi,
Thanks.
It is running 10.5.8.
I am trying to boot up an external drive with 10.5.8 on it. It works on my Macbook Pro which is running 10.5.8, runs on my IMAC running SL. But doesnt work on the mac mini?
It had been running SL, however there are a number of programs I have like Windows Live Sync which are not yet compatable with SL so i downgraded to 10.5.6 which came with the Mac Mini then loaded all updates.
It seems to just go into an auto reboot as soon as i click on it.
i thought it might be the firmware? Is it possible to downgrade them and then re-install?
I have reset the PRAM.
Any help would be appreciated.
Thanks

How to transfer files after booting from external drive?

My fathers MB Air has been failing to boot, most likely due to lack of space on hard drive. I've come to the conclusion seeing as how its a 2014 model and he has 6 GB's of free space on his main dirve. I've managed to boot his MB Air from an external drive and now I need to know how to transfer his files to the external hard drive from the internal hard drive, while of course running on the external device. I apologise if this made no sense; trying my best here. If there is any more information required to answer my question please don't hesitate.

There are two backups to be concerned about. Your iOS devices can backup your App purchases to the computer (that can get big fast!) and it can also backup personal settings. Personal settings can be backed up to your iCloud account and Apple provides 5GB free space which is just enough to back up two devices. I suggest the personal data (basically how you have your iOS device configured) be backed up to the cloud rather than the computer. This will free up about 5GB. Once this has been done, open iTunes, select preferences, click on the Devices tab and you'll see the stored backups (if any). Delete each one.
The backed up apps are stored in the iTunes folder. Inside the music folder you'll find a folder labeled Mobile Applications. Good news: you can delete this folder (mostly) safely because it costs nothing to redownload apps if needed. Bad news: if the app is removed from the App store it can't be downloaded again. This has never affected me but it is a potential problem. My solution is that I don't backup my apps to the computer. In the rare event that I need to wipe my iOS device and restore it I've found that downloading the Apps again (which is done automatically for you, no need to remember what you had) takes no longer than restoring them from the computer's hard drive.

Mac Pro trying to boot from external drive instead of HD?

my osx was recently reinstalled at the Genius Bar due to a boot problem caused by a power outage. Now if i want to boot up
i have to unplug time machine first; it is possibly trying to boot from the external drive till i unplug it. What should I do?

I would have:
not let you go home without also buying
a 1500VA UPS
a new system drive
other drives as needed
start with a clean install of the OS to a new drive
Clone your system when you do get a good install and update (Apple only)
then clone again when you have all your apps in place
Don't assume anything works, in fact assume nothing will for now.

Can't boot from external drive, no options...

Okay so I just upgraded my 24" iMac to Snow Leopard, from an external drive, and things seemed fine. I was migrating my old settings and then after I noticed I couldn't access system folders. It wanted old settings' permissions, not the new one, so I right-clicked on the folder and set permissions so that anybody could write to it.
Still didn't work. I thought I should then reboot.
So I did. But now when I try to log on, to my old profile or my new one, neither password works. Even though they're the same. If I get it wrong enough times, it will let me put in the master password for the computer, in a separate pop-up, which is the same, and that works.
Then it wants me to give a new password, back in the old password box, and then it just shakes angrily afterward, not accepting anything I type. Why is this?
The next step seemed to be re-install Snow Leopard. But pressing the option key at startup doesn't let me boot up from the external drive. I looked online with my macbook and found all these other boot options, but none of them work. Not a single one has any effect.
One thing I should mention is that I'm not using the standard iMac keyboard, not sure if that makes a difference. It's a PC keyboard and the keys are just slightly rearranged but it has Alt, Ctrl, and the option key is a circle with the windows logo in it. Any chance that the new OS isn't recognizing the new keyboard properly?
I just don't know what else it could be. Any help is appreciated.

coconutmelodies wrote:
I only have one master computer password, and it's not the same as any of my other passes. That's the pass that's needed to log on, and access system info. However it's also the same password as my old profile, that I was migrating over (which is still confusing as to how to do a clean install and then bring old admin info over so they work together seemlessly) so now when trying to log on, after the first reboot, I saw that I could log on to the old or the new profile. As well as a guest account, which isn't accessible though.
It sounds like here you are talking about an admin user account & its login password rather than a "master" password. Only admin users can access & change system info (more or less). However, you cannot merge two user accounts, if that is what you mean by 'bringing old admin info over so they work together seemlessly.' Also, keep in mind that each user is a separate entity as far as the computer is concerned, whether or not they have the same login password, & that you can log into & use only one account at a time. So for instance, if you have a user account "A" created on the Mac & an imported/migrated account "B" from another Mac, if you are logged in as "A" you will not be able to access info in the folders belonging to "B" unless while logged in as "B" you previously explicitly set permissions on those folders for "A" to access them.
So whichever profile I attempt to log onto, when I type in the password, (there's even an obvious clue after a few tries, so no chance I'm getting it wrong) the box shakes like I got it wrong.
The box shakes only if you did get it wrong, so I don't understand what you mean about there being no chance that you got it wrong.
After like six tries, it asks me for a "Master Password" "Type the master password to reset this uer's password" into which I put my regular login pass that I've been trying over and over, and here it does work.
"If you change the password for this user account, you will create a new keychain to store the user's passwords"
So then it asks me to put in a new password, and verify it, but after each try it just shakes. It won't accept anything.
Again, I don't understand what you mean in the first paragraph above when you say "here it does work." The Master Password the dialog box asks for is one you would have had to previously explicitly set up for the computer in the File Vault tab of the Security System Preference. It is not associated with any user account (& again, it makes no difference if you set it to the same one as for one or more user accounts). It's purpose is as a "safety net" to unlock File Vault protected user accounts. As explained in Mac OS X 10.6 Help: If you forget your password for your FileVault-protected account, you must first fail to enter the account's password correctly three (not six) times, then click the “Forgot Password” button to get to the Master Password dialog box. Entering the previously set up Master Password allows you to set & verify a new password for that account.
If you can get this far, it means you are successfully entering the Master Password & have successfully reset the account's password to something new. If the box shakes after you then try to log into that account, it means you have not entered the same characters at the login screen as you did when resetting the account password.
If you mean something else is happening please explain it more clearly, in step-by-step fashion including the results of each step. Don't say things like "try it." Instead, say that you clicked on the "OK" (or whatever named) button & say what the result was.

Trying to boot from external drive using Startup manager

Hello forum geniuses
I would first like to make an announcement...my loved and cherished iMac G5 has moved on to the next life. Something to do with the motherboard. Your thoughts and prayers are welcome...
But some part of her may live on! You see, we had the hard drive taken out and put into one of those Hard drive shells, so it now works as an external hard drive. I plugged it into another iMac G5 and it works fine as an EXHD. However, I have been working with some very complex Final Cut pro projects so I ideally I want to boot the computer from my original hard disk to preserve all of my file paths. Since it is the original system disk, it should contain an installed copy of Mac OS 10.4 and the original system folder, and it should work as intended, correct?
The problem is, when I hold down the "option" key at startup, I don't get my old hard drive (which is now an external plugged in through firewire, for those playing at home) as a bootable option.
Does anyone know where I'm going wrong here?

Thanks for the reply. A couple of things...
Using my iBook laptop, I booted from the original drive from my old computer and it worked perfectly. Startup manager allowed me to select it and it preserved all my settings and data without a hitch. Exactly what I WANT to happen on the other G5
Remember, this isn't a clone or a copy of my old hard drive - it is the ACTUAL hard drive with an enclosure that allows me to plug it in as an external - so it has to be made bootable, since it is the original.
Also, I can't transfer my data from the original hard drive to the other iMac because there is more than 200GB of data on the original and the other one only has a 120GB hard drive.
So I think the question is, if the standard startup procedure works on my iBook why isn't it working on the iMac G5?

Can't Boot From External Drive

Situation:
Prior to upgrading to Lion I used SuperDuper to create a copy of the existing internal hard drive on an new external drive (iOmega eGo 500GB).
Tested booting from the external disk and it appeared to work correctly.
Upgraded to Lion.
Several days later attempted to boot from the external disk (by setting the start up disk in the system preferenes ) but it fails.
The system always boots into Lion.
What I've tried:
Setting the start up disk through system preferences
Holding down the option key to select a disk on startup - interestingly enough I only see the internal hard disk and a recover HD. No sign of my external disk.
Using a clean partition on the external hard drive I installed SL from the retail DVD. This produces the same effect of system booting to Lion on the internal drive, which suggests that the problem is not related to the copy I made using SuperDuper, but rather has to do with the external drive or something in Lion that prevents using an external drive (but I've never heard of such a thing).
Talked to technical support at Apple since I had newly purchased Lion. They couldn't offer a solution but did give a lot of thought and suggestions - but they don't support booting from an external disk.
Talked to iOmega technical support. Not helpful but did figure out at the end of an online chat that they don't support their disks being used for external booting.
Emailed SuperDuper. Very helpful. They offered some suggestions but in the end these didn't work.
Characteristics
Lion 10.7.4
iMac 2007
External Drive Interface FW800
I'd appreciate any suggestions as to the cause of the problem and possible fixes.
Thanks

@shootist007
Still no success but more information:
I found the USB cable for the drive, connected it to a powered USB hub (note that there are two cables going into the hub that must merge and go into a single connector for the USB interface on the drive). with both cables plugged in I still can't get the external drive to boot.
I need to do one more experiment on this. The hub is fully loaded so I'll try removing as much load as possible on the USB to see if I can get it to work.
Regarding your question, there is no way to get power to the drive. (Now I think about it, the design is for a portable drive that you can carry around with you so iOmega aimed the design at not needing a power supply to make it very portable). Hmmm, didn't think about that when I purchased it.
If reducing the load on the hub doesn't make it work then I'l have to get a replacement drive with its own power supply.
Thanks for your help. Even though no success yet I suspect you've identified the problem.

Trouble Booting from External Drives - MBA 2012

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