Cannot boot Snow Leopard from external FireWire drive

I use a Western Digital My Passport Studio 500 GB external drive to back up my MacBook Pro with Time Machine. I had created a 30 GB Leopard boot partition with various utilities and tools; since the small drive goes wherever the laptop goes, I figured it might come in handy to be able to boot the computer in the event something went wrong with its internal 250 GB drive.
Over the weekend, I upgraded the external drive to Snow Leopard, and now it can no longer be used to boot the laptop. The symptoms are truly weird. Holding down the Option key while rebooting does not show the external drive unless I disconnect and reconnect the FireWire cable. The drive then shows up. I select it, and it appears to begin to boot, then it just sits on the gray screen with the little round thingie turning for a long time (five to ten minutes). Eventually, the system boots from its internal drive. This happens regardless of whether I'm connected by means of FireWire 400 or 800.
After spending a lot of time looking at the usual suspects (cables, permissions, PRAM, etc.) I reinstalled Sand Leopard (OK, 10.5) and lo and behold, the drive boots again (though for some reason I still have to go through the disconnect/reconnect routine). Clearly, something in the OS has changed with respect to the way booting from external drives is handled.
On the positive side, I have none of the symptoms described in other threads: Time Machine works flawlessly, and both the boot partition and the Time Machine partition appear on the Snow Leopard desktop every time I connect the drive.
Does anyone have the same issues? Does anyone know of a workaround?
Thanks,
Daniel

Hi,
Working from a MacBook Pro 2.4 (Santa Rosa) with 4gb ram, running OS 10.5.7-
(All external HDs are 7200 rpm)
Shortly after our fresh install of Snow Leopard onto a new but already tested External 1.5 Seagate Barracuda (with the most current firmware), in an OWC Mercury Elite enclosure-
We installed Snow Leopard smoothly to that external HD without any issues, and it booted up from that 1.5T external HD, and worked fine.
Then, still working from the MacBook Pro, I turned on and booted another external HD (a Newertech Guardian Maximus RAID running 10.4.11 via FW800, daisy chained to the 1.5T External with Snow Leopard newly installed.
Again that's MacBook Pro <FW800> Snowy external HD <FW800> 10.4.11 RAID (booted & working from the RAID).
But when I tried to bootup up Snow Leopard, after doing the work on the 10.4.11 RAID-
It would not boot up.
Though Snowy would appear as an available Start Up disk, each time it was selected as the Boot drive,
the Internal HD OS 10.5.7 booted instead.
I changed around the cables and tried repeatedly.
Same result, no Snowy boot.
Even after the OS 10.4.11 external RAID was power down, and disconnected.
After some looking around, I found this forum:
http://discussions.apple.com/thread.jspa?threadID=2136208&tstart=0
Got me thinking.
I tried the USB, and it booted !
I tried the FW400, and it booted !
And mysteriously, at this point- I tried the FW800, and it booted !
And then, the MBP boots seemed to reliably boot from that external, via FW800.
Bizarre.
Snow Cat needs to be taught originally how to find FW800 from the bottom up ?
Turns out, Snow Leopard doesn't like booting,
if the preceding boot was on the 10.4.11 RAID, and work was done with programs there.
So, once again, I repeated this process:
After working with programs on the 10.4.11 external HD,
the MBP would not boot the Snow Leopard external HD,
it defaulted to booting from the MBP internal HD OS 10.5 via FW800.
even though Snowy was selected for Start Up.
This was the case repeatedly.
(It would also boot from the 10.4.11 external RAID, if it were selected for Start Up.)
(In each of these tests below, I only rebooted the computer at each test. I did no work with programs on the various HDs.)
SO, once again, at this point of the process:
I plugged in that Snowy external HD via FW400,
and it booted up fine !
Then I booted up from the Internal 10.5, and tried to boot Snowy via FW800 again.
It worked !
Then I turned on the 10.4.11 RAID external HD, and tried to reboot from the Snowy external HD.
It worked too !
Then I booted from the 10.4.11 RAID, it came up fine.
Then booted from the Snowy, it came up fine.
Then booted from the Internal HD 10.5, it came up fine.
Then booted from Snowy again, it came up fine.
Then I turned off the 10.4.11 HD, booted from Snowy, it came up fine.
Then booted from the Internal, it came up fine.
Then tried Snowy one last time, it came up fine.
Anyway, the issue is:
It works fine-
Except when I do work within the programs on the 10.4.11 external RAID.
Then I have to use FW400 or USB to get it to boot once again . . .
Regardless of whether the other external HD is removed from the system.
It's some sort of flaw, and totally repeatable in testing.
Hopefully, it will be fixed soon.
Howard

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Can't boot snow leopard from external drive

I have a copy of snow leopard installed on a separate usb hard drive which I use to run some PowerPC programmes under rosetta. I can attach this USB drive to my Mac Pro and also to an Intel Macbook and choose to start up on this external drive without any issues. However when I try restarting my new 2011 iMac on this external usb drive the machine crashes every time with a kernal panic. Is this problem unique to me or does everyone else have this issue with new iMacs. Mine is a 27" 3.4ghz i& with 12ghb ram installed running 10.72. Is their soemthing I can do to resolve this problem?

I have now solved the problem of being able to boot from either Snow Leopard or Lion on a new Mid 2011 iMac. This is how I did it.
1. Attach an external USB drive to an earlier Mac or borrow one from a friend. In my case I used my 2009 Unibody Macbook (which has Lion installed on it but does allow you to install Snow Leopard on an attached device) Put the Snow Leopard install disc in this machine and tell it to install Snow Leopard on your attached USB Drive.
2. Start up the Macbook (or whatever machine you are using) and get it to restart on the attached USB drive so that it boots up in Snow Leopard. Then when Snow Leopard is up and running on the attached external drive, do a software update to bring it up to 10.68 (the current version). This step is important as I found that if I plugged in the external USB drive into the iMac with only operating system 10.6 installed it would cause a kernal panic on start up when I choose to start up on the external USB drive.
3. With Snow Leopard updated to system 10.68 you can now plug it into your iMac and restart the iMac booting into Snow Leopard from the external USB drive. You do this by either going to System Preferences>Startup disk and choosing the external drive, or by holding down the option key when you restart your Mac and choosing the external USB drive.
4. The next step is to make your iMac dual boot now that you know it can run Snow Leopard successfully from an external USB drive. To do this, go into Utilities>Disk Utility and select your main drive. Select the main disk (with Lion on it) and then choose Partition and choose 2 Partitions. Drag the first partition bundary line down to make the second partition size as small as possible. In my case I had a stock 1TB drive and the smallest partition size it would allow me was 70gb. Create the second partition (assuming you have spare space on your drive to allow this to happen). This will then create a second hard drive icon on your desktop. I renamed mine "Snow Leopard startup".
5. Download the free (and excellent) utility Carbon Copy Cloner and use it to copy your Snow Leopard operating sytem from your attached USB external drive to your new partition.
6. That's it! Now you can choose to start up your iMac from either Lion or Snow Leopard using either method mentioned in 3 above.
7. As a final step I suggest your install your Rosetta only programmes in your new Snow Leopard partition so that you can access them easily and keep them all together.

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"How to install Snow Leopard from an External Hard Drive"
* Launch Disk Utility
* Select the External Firewire/USB device that you want to use as the boot drive for the upgrade
* Click “Partition” from the menu options
* Select 1 Partition, then click “Options” below the partition scheme
* Select the top option for “GUID Partition Table” – it MUST be GUID to be bootable!
* Click OK to create the GUID partition (this will reformat the drive, ie: all data is lost)
* Next, click the “Restore” tab within Disk Utility
* Select your newly made Snow Leopard 10.6 Install DVD image and restore this image to the GUID partition you just created OR…
* Alternatively, you can select the Snow Leopard Install DVD and restore directly from the DVD to the GUID partition
* After the restoration is complete, your GUID partition will now be bootable by Mac OS X!
* Reboot the Mac holding down the “Option” key to pull up the boot loader, select the Snow Leopard install drive you just created rather than your default Mac OS hard drive
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Yosemite on internal HD and boot Snow Leopard from external HD clone

Hey Everyone,
I recently cloned my Snow Leopard 10.6.8 internal HD to an external FW800 HD which I can boot off. I have backup of everything, both Time Machine and straight backups.
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Hello. I have a similar question. I recently purchased a new iMac (21.5-inch, Late 2013, 3.1 GHz Intel Core i7, 16 GB 1600 MHz DDR3) running OS X 10.10.2 Yosemite.
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On my old iMAc (still set up and using it) which is a 2007 machine and running Mt. Lion, I was able to select which drive to start from, between Snow Leopard and Mt. Lion.
This allowed me to keep playing Sid Meier's Civilization III (the last version where you can build a palace).
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Have a look here
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Snow Leopard and external firewire drives

When is Apple going to acknowledge the problems with external drive access created by Snow Leopard?

Quite correct. I should not expect Apple to answer the question here. And who knows maybe they are actually working on a solution.
Since you made a kindly offer I will describe the problem in more detail.
Since upgrading to SL I have had constant problems with my firewire external drive. Unfortunately that was the drive with my Time Machine backups. The symptoms of the problems revolve around startup and recognition of the drive. The drive appears in the list but will not open, Time Machine attempted to initiate backup and just spun. I discovered that it was necessary to completely shut down my Imac, disconnect the firewire drive and power it down. I have tried leaving the drive connected and powered, sometimes the Imac sees the drive sometimes not. I have tried leaving the drive connected but powering it down, powering it up and starting the Imac sometimes it sees the drive sometimes not but more frequently than when I leave it connected. The most reliable way to reconnect to the drive is to shut down the Imac, disconnect and powerdown the drive, startup the mac, login, repower the drive and reconnect.
In the course of trying to find a solution I have tried both Disk Utility use and Tech Tool Pro. Both programs are unable to correct the problem, most frequently displaying the message "unable to unmount drive". However after the above mentioned repower sequence running either Disk Utility or TechTools Pro describes the drive as OK.
In the course of all of this I decided to wipe the drive and reformat. I was unable to remove the Time Machine files to another drive so I made the decision to abandon the backups since I made additional manual backups of the critical files and I have all my install disks.
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I would like to emphasize that I operate and have operated my Macs as absolutely "box stock" with no system tweeks or any third party tools. The majority of my software on this machine is Apple both Works and Life. I have MacLinkPlus Quicken, Stuffit, Bento, Data Desk, Photoshop elements, Firefox browser, Flip 4 Mac and DivX as the only third party software.

Boot from external Firewire Drive-cannot repair or optimize internal drive.

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I did name the new external completely different from the internal.
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Richard Signes2 wrote:
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Also, like what has occurred in the past, Apple does eventually issues a firmware update in later OS X versions so that earlier OS X versions, despite the Mac previously being able to boot from them, won't any longer. However far as I know Apple hasn't done this quite yet, but will one day.
Baring those issues, if you installed 10.6 on a external drive using a machine specific black/gray disk from another Mac, it has hardware drivers for that model/year of Mac only.
If you used the 10.6 white retail disks from Apple, it only has hardware drivers for all previous Intel Mac's that came originally with 10.6.2 or earlier from the factory. Mac's with 10.6.3 or later on the drive from the factory have different hardware drivers, thus not on the 10.6.3 white retail disk.
To find out what OS X version came on your machines, use the free MacTracker and use your model indentifier in the Apple menu More > Info (aka System Profiler)
So for those Mac's that originally came with 10.6.3 or later, machine specific disks must be gotten from Apple, or if your really talented, it's possible to create a univeral 10.6-10.6.8 install disk by combing the 10.6.3 image with the 10.6.8 combo update which will boot on any Intel Mac if the firmware permits and the hardware drivers are compable.
There is a method to bypass the firmware and install on Mac's that are Early 2011/Late 2011 via Target Disk Mode, or via taking the drive out of the machine as some Late 2011's use the same hardware drivers as the Early 2011 machines (only a processor bump basically)
How to revert your Mac to Snow Leopard
For the MacAir, you can install 10.6 via a USB thumb drive, of course provided it has the hardware drivers.
http://www.maciverse.com/install-os-x-snow-leopard-from-usb-flash-drive.html
So in your case you likely should be rather looking at running Snow Leopard in a virtual machine program in Mountain Lion, which MichealLax over at MacRumors has perfected a technique.
Windows in BootCamp or Virtual Machine?
http://forums.macrumors.com/showthread.php?t=1365439

How do I boot Leopard from external hard drive?

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Tried safe boot. Only difference was iCal reminder popped up in space.
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AR

Apple support has told me that you cannot boot a MBP from an external drive when Leopard is installed on a MBP.
That is just plain wrong.
1) Hook up your external drive. Use FireWire for better performance.
2) Launch Disk Utility and highlight the actual drive icon at the left. Click on the Partition tab.
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4) Set up your partitions however you want and click the Partition button at the lower right.
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Hi all,
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You can only do what you are trying from a model that can be booted into Snow Leopard. You have a 2014 model that can only be booted by Mavericks or Yosemite. You cannot run Snow Leopard on your machine except in a VM or a Mac from 2010 or earlier.

Can WinXP be loaded and booted from external firewire drive?

The subject line probably says it all but:
Does the recent firmware upgrade and/or BootCamp allow you to install WinXP on an external Firewire drive rather than partitioning the iMac Core Duo's internal drive?
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The other problem is XP itself doesn't support booting from firewire. Even if someone could figure out how to install to an external from bootcamp, you would still have to contend with XP.
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Cannot install Snow Leopard onto external drive

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I'm able to perform the first part of the install by selecting the external drive but when I have to restart and complete the install from the original Snow Leopard disc (10.6), the external drive no longer shows up. I've tried several times and have restarted the Icy Dock external drive enclosure.
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Not necessarily. Use a backup utility so that you can deselect all the data from within your Home folder as well as third-party applications in order to create a bootable disk but without some of the excess. Any of the following should be suitable:
Backup Software Recommendations
Carbon Copy Cloner
Data Backup
Deja Vu
Silver Keeper
MimMac
Retrospect
Super Flexible File Synchronizer
SuperDuper!
Synchronize Pro! X
Synk Pro
Synk Standard
Tri-Backup
Others may be found at VersionTracker or MacUpdate.
Visit The XLab FAQs and read the FAQ on backup and restore. Also read How to Back Up and Restore Your Files.
Message was edited by: Kappy

Booting from external Firewire drive--possible?

If I add a USB/Firewire card to my Beige G3 minitower (300MHz), can I then boot from an external Firewire hard drive on which I have installed Panther? A comment by Tina Garfield in another thread seems to suggest this is indeed possible. (I didn't want to "threadjack" that discussion, so I created this new one. I hope Tina sees it and can help me.)
Tina wrote the following:
Having Firewire allows you to have external drives,
which you will be able to boot from, and make
backups and maintenance especially easy.
I was under the impression that the Beige G3 can't see iadd-on Firewire/USB cards until the machine has booted from the internal hard drive. I really hope I am wrong! If it is indeed possible to have the machine recognize the external drive at startup, and there is something I need to do to enable this, please let me know.
Thanks!
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Hi GeeKay,
Ditto to everything Grant posted, with an extra reminder to be sure to download XPostFacto 3.1 and not version 4. I believe on the XPF page ( http://eshop.macsales.com/OSXCenter/XPostFacto/Framework.cfm?page=XPostFacto3.ht ml ), the download for 3.1 is a little bit down the page.
If/when you buy an external FW drive be sure it has an Oxford chipset. If the description does not include mention of the the Oxford chipset, I would strongly recommend finding another external drive that does specify this. Our Beiges are very particular about what they will accept for external booting, and the Oxford chipset is a critical component.
Also, I've found, since I do partition my external firewire drives, that I can boot only from the first partition of the external drive, similar to the behavior of our internal drives. In addition, with one of my Beiges, my "helper" disk that I specify to XPostFacto to allow me to boot externally must be the first partition of my internal drive.
I don't believe that you can actually INSTALL to an external drive. I simply cloned my internal drive's system over to the FW drive. This can be done with software such as the free Silverkeeper ( http://www.lacie.com/silverkeeper/ ) or with shareware SuperDuper ( http://www.shirt-pocket.com/ ) which are both great for all backups. I happen to prefer SuperDuper because of its redundancy -- it explains EVERY step before you take it and then, even after you tell it to go ahead, it asks you again to be sure That's what you want to do.
Once set up, however, it is extremely cool, and helpful, to be able to boot externally. If your external drive is dual USB/FW, you will only be able to boot when connected via Firewire. None of the Beiges are USB-bootable.
Hope this helps, and keep us posted,
Tina

IMac 2.8Ghz + booting from external FireWire Drive

I was wondering if anyone has 'booted' from an external FireWire drive using the FireWire 400 port?
After going through the issue of reformatting my external drive with the GU-ID partitioning scheme, I found that the drive would mount on the FW400 port but wouldn't boot. In the end I used the FW800 port and the drive booted up first time. On my old PowerBook I could boot from both FW400 & FW800, does anyone know why FW400 doesn't work or is it my iMac?

If it mounts then you can install OSX or clone OSX and then boot from it. From what you are saying a bootable partition will boot on 400 just not on 800, which is quite odd, I concur.
Note that they are notorious for needing the right power supply and they all look identical - I had problems of recent with a triple extreme 1 TB on FW 800, and took it to LaCie (a mile from where I work) - they told me I was using the wrong power supply and gave me the right one free. When I got home I did have the right one in a pile with others. 4.2 A vs. 2.2 A and it worked great. And I have a spare free power supply.
I don't think drivers even enter into it at all with firewire, e.g. drive specific drivers.

Stupid question: force booting from external FireWire drive

My PowerBook is refusing to boot from it's hard drive (flashing ?/folder), which I'll be attempting to repair using DiskWarrior, etc.
But it's also not finding and booting from the OS X installed on my external FireWire drive (which it could do under normal circumstances). How do I force it to do that given that I'm unable to set the Start Up Volume in the normal manner?
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Dale,
Thanks for your response. I've been through the usual stuff as in your reference and I eventually got it to boot off the external HD by just leaving it long enough - it took maybe 10-15 minutes. I'm booted from it now. I hadn't thought of using the Startup Manager, but will try to remember next time.
As for the internal HD, it's looking like it's dead - neither Disk Warrior nor Data Rescue II seem to be able to see it. I tried Disk Utility from the external HD, but it doesn't see it and nor does the Profiler. Maybe it's just a loose connection internally. There is a noise coming from the PB from about just under the division between the left hand rest and the speaker. It sort of sounds like a disk continually being read or written - ie. a sort of very rapid clicking, but I don't think it's the HD. And I don't think it's the fan. Anyone with any ideas before I call AppleCare?
I did have a very similar problem a few weeks ago (http://discussions.apple.com/message.jspa?messageID=1465680#1465680), but Disk Warrior fixed it apparently with next to no problems. I was going to wipe the drive at the weekend & reinstall, but didn't get round to it in the end ... Fortunately I had a backup this time and was able to restore my user simply by copying it.

Cannot boot Snow Leopard from external FireWire drive

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