Booting from external USB drive

I was wondering if there is any way to boot from a USB drive that I have? I partitioned the drive, erased it, and its basically ready to go. But I can't install Mac OS X on it because it says that I cannot reboot from the drive.
I know that iBook G4s generally can't boot from a USB devise but is there any way to get around this?

If you're computer is having kernel panics there's a conflict; either software or hardware. 2GB of free space isn't enough but I haven't seen anything that suggests KPs are caused by too little free space. Your computer should start fine with 2GB free. It may have problems after a period of use but it would startup and run.
Try starting in Safe Mode. If successful move some of your files to the external drive and then restart normally. If it KPs again, restart in safe mode and disable all startup items in System Preferences>Accounts>youraccount and restart. If it KPs again go through the linked troubleshooting steps by Dr. Smoke step by step. That's the only way to resole your problem.

Similar Messages

Slow boot from external usb drive

I just upgraded my daughter's macbook to the latest fixes on her internal drive. I reformatted her external LaCie drive to Mac OS Extended(Journaled) and did a restore. I did notice that there are less files on the internal than the external drive when comparing immediately after the restore. When I try to boot from that drive, it takes 10 minutes to boot the system. It takes about 7 minutes before I even hear any drive activity. In the past this system used to take about 2 minutes to boot at most vs 30 seconds from the internal drive. I have repaired permissions without seeing any effect. I did attach another USB drive that had a copy of her old OSC 10.5.8 image and that booted in less than 2 minutes. Any thoughts on what could be causing the long boot time on the external drive? I have seen comments on GUID formatting. Doesn't that come automatically with Mac OS Extended(Journaled) on an Intel machine? Should I have selected an option when doing the format to specify GUID? I did run a verify Disk as well and the extrnal checked out without any problems.

+" ... and did a restore ..."+
How, of what, from where, to where?
+" ... I have seen comments on GUID formatting. Doesn't that come automatically with Mac OS Extended(Journaled) on an Intel machine? ..."+
No, it does not happen automatically when you format the drive. GUID is a partition type, not a format. You specify GUID partition scheme at the time you partition the drive. Formatting is a separate operation, occurring after partitioning. Drives that will be used to boot an Intel Mac must be GUID partition scheme and formatted as Mac OS Extended Journaled.

Macbook 2012 not booting from internal drive but booting from external usb drive

hi everyone!!
here is what happened:
i have worked all day on my macbook pro, normally. when i got home and turned it on (i always power it off for rolling with it) it just didn't load the OS.
i run mavericks on a i7 mid 2012 macbook pro 13". it had an accident on last december and fell on the ground, but i've changed the hdd and it worked normally until last week when this happened.
i have a copy of my system on a usb drive and tried to start up from it and it worked.
i took my hdd from inside the lap top and started from it (yes, the same hard disk that was inside the machine) and it worked.
i took the macbook to an apple store and the "apple genius" that was there started up my machine from inside with another hdd running yosemite that they have in the store for testing.
today i bought a new hdd and put it in. but i can't format it or install the system. i had these 2 errors on disk utility
"partition failed with the error: wiping volume data to prevent future accidental probing failed"
and
"restore failure an error (32) occurred while copying. (broken pipe)
so:
it loads from my internal drive, but only when its connected via usb
it loaded the apple store drive internally
it does not format my new drive nor install the system on it
ANY suggestions, please??? it's really difficult to me to solve this problem...
thanks a lot!!!

Must be a bad SATA cable undetected by Apple Techs. A result of the drop but they are also quite fragile.
Disturbing the cable can cause it to work for a while. Cheap repair at iFixIt.

Satellite L20-100 can be booted from external USB hard drive?

I recently bought Toshiba Satellite L20-100 and I wonder if:
1. is there any possibility to boot this machine from external usb hard drive?
2. it is possible to attach another internal hard drive?
Supposing that the both answers above are 'no', how can I solve the following problem: I need hdd space, I need to boot 3 separate Wxp Operating Systems onto the same machine (Toshiba Satellite L20-100).

Booting from external USB HD - "No" would be the official, mcrsoft sponsored, answer. However, it is possible. Not easy but it can be done. I've seen it done with my own eyes and there are guides how to do this. Just look for it with search engine. But if you have enough disk space you better do what was suggested here - create 3 partitions and use boot manager.

Hard drive dead/Boot from external hard drive?

My hard drive failed and I need a new one. For the time being, I'd prefer not to open up my iMac and replace the internal hard drive. I have an external USB hard drive and I cannot install OSX onto this drive (strangely, it takes the first disc but not the second).
Is it possible to boot and run an iMac G5 from an external hard drive? If so, what is required for hardware and what steps need to be taken?
If not, what course of action would you recommend?

It is very easy to boot an iMac from an external drive, but the drive should be a Firewire drive. Get one, then get SuperDuper!, which will enable you to clone your data and system to it. You can then choose the external firewire as your boot drive and operate without any problems.
Apparently, there are ways to boot from a USB drive, but they are complicated and a firewire drive is very straightforward and fast.
Let us know how you make out,

Ibook g3 M2453 boot from external DVD drive

Hi, I'm Simon from Germany.
I have an iBook M2453 Mac OS X and a lot of dvds.
But the iBook has no DVD drive. So I bought an external DVD drive. But no matter what I do during boot (press the C key or alt)
I can not boot from external DVD drive.
Please help me
Thank you.
Simon.
PS: I have translated the text using Google translate

Hi Simon,
the iBook is able to boot from USB, but this is not expected behaviour and not supported by Apple.
http://support.apple.com/kb/TA20554
There are some external enclosures that do the trick.
But only when you press ALT after Power on. (Select a startup volume via the Startup Manager)
External enclosures with Prolific PL-3507 chipset (Firewire/USB Combo)
You will find them on Ebay Germany
I have a Delock IDE>USB 2.0 enclosure for 2,5" HDs
http://www.delock.com/produkte/gruppen/Geh%C3%A4use/Delock_25_external_enclosure _USB20_42365.html?setLanguage=EN
that works also.
Hallo Simon,
das läuft nur mit einigen wenigen externen Gehäusen. Such auf Ebay nach "PL-3507"
und nimm eins mit Firewire und USB Anschlüssen.
Ein Festplattengehäuse von Delock für 2,5" Festplatten ging auch ( Link oben)
Ein Boot ist nur möglich wenn du die ALT Taste nach dem Einschalten drückst und dann über den Startup manager dein Boot volume auswählst.

Booting from external hard drive on intel-based MacBook Pro

Good day everyone. I know similar questions were raised in this community, but I still have some questions.
I have MacBook Pro(late 2011) with OS X 10.7.5 and external hard drive with Ubuntu 13.04, from wich i can boot succefully on my PC. But MacBook Pro will not boot from my external drive, no matter which key/combination i use during restart.
After googling I found some answers to my initial question, how to boot from external hard drive
https://discussions.apple.com/thread/1852633?start=0&tstart=0
http://www.everymac.com/systems/apple/macbook_pro/faq/macbook-pro-boot-from-exte rnal-firewire-or-usb-drive.html
http://support.apple.com/kb/ht1948
As I understand I need to format my external hard drive into GUID partition type and this will be enough to be able to boot from it on my mac?
With this new partition type, will I be able to install ubuntu again on my external drive?
Does GUID partition type supports NTFS, ext4 and FAT32, linux swap?(I use ntfs for big files, ext4 as partition for ubuntu and fat32, because i use windows, linux and osx)
Will I be able to boot from my pc from my external drive with this new partition type?
What are downsides, if any, to GPT?
here is info on my e-drive

LowLuster wrote:
The only OS that will boot from an external drive is Mac OS X or maybe Linux. For OS X to be installed on any drive it need to be formatted Mac OS Extended and have GUID partition table.
As for Linux I'm not that familiar with it but again for a Mac to boot it need an EFI partition on the drive and I don't think that is possible with NTFS or FAT32 let alone the native Linux format.
Went to wiki to learn more on efi but found artice on uefi.
Operating system loaders are a class of the UEFI applications. As such, they are stored as files on a file system that can be accessed by the firmware, called EFI System partition (ESP). Supported file systems include FAT32, FAT16 and FAT12, and supported partition table scheme is GPT only. UEFI does not rely on a boot sector, although ESP provides space for it as part of the backwards compatibility.[26]
Here is FAQ on official uefi website.
Can UEFI Secure Boot be adopted and implemented by a variety of operating systems?
UEFI specifications are platform-independent, supporting multiple platforms and architectures. In addition, UEFI specifications are designed to promote cross-functionality, as well as to support broad adoption across multiple operating systems, including Windows as well as Linux-based operating systems. The specifications are robust and can potentially complement—or even advance—other distributions, such as Linux-based distributions.
And here is wiki article on GPT expaining OS support.
It is obvious both uefi and GPT are ok with Linux and file systems such as FAT32, ext4 and NTFS.
I guess there is no much difference(or is that the same thing?) between uefi and efi used in Macs.
In your answer to Stark Industries you said that mac can boot linux from external hard drive, well this is not the info i got of official website and it is still my question, because your answer is very inconclusive and your info is partially incorrect

Booting from external usb3 drive

Hi, I am trying to boot Linux from an external USB3 drive.
Here are the symptoms.
1. I have uefi boot disabled.
2. I connected a Toshiba USB3 drive to an USB2 port. The device is NOT recognized as a bootable device under Legacy Boot Devices list hence I cannot boot from the USB drive.
3. If I boot from internal HDD, then I can access the USB3 drive without any problems.
4. Plugged in an external USB3 Docking Device to the USB2 socket.
5. Then the USB3 Docking Device is recognized as a Legacy Boot Device and I can boot from the Docking Device.
6. Installed USB3 PCIe card.
7. Connected the USB3 Docking Device to USB3 port.
8. Now I the Docking Device fails to appear as a Legacy Boot Device.
9. Connected the USB3 Docking Device back to the USB2 port and straight away it is now recognized as a Legacy Boot Device.
I would appreciate if any one can give some hints on how to get the USB3 devices recognized as legacy boot devices.
Many thanks.

gdesilva wrote:
Hi, I am trying to boot Linux from an external USB3 drive.
Here are the symptoms.
1. I have uefi boot disabled. (did you mean secure boot?) Did you enable Legacy support?
2. I connected a Toshiba USB3 drive to an USB2 port. The device is NOT recognized as a bootable device under Legacy Boot Devices list hence I cannot boot from the USB drive
3. If I boot from internal HDD, then I can access the USB3 drive without any problems.
4. Plugged in an external USB3 Docking Device to the USB2 socket. This won't help
5. Then the USB3 Docking Device is recognized as a Legacy Boot Device and I can boot from the Docking Device.
6. Installed USB3 PCIe card.
7. Connected the USB3 Docking Device to USB3 port.
8. Now I the Docking Device fails to appear as a Legacy Boot Device.
9. Connected the USB3 Docking Device back to the USB2 port and straight away it is now recognized as a Legacy Boot Device.
I would appreciate if any one can give some hints on how to get the USB3 devices recognized as legacy boot devices.
Many thanks.
Help us to help you by posting the following information.
1. The full Model No. and Product No. of the desktop PC - see This HP web document if you don't how to locate the model number and\or product number.
Enter the BIOS after you have setup the bootable Linux hard disk as shown in the following video andenable usb 3.0 configuration in Pre-OS if it is available in the BIOS. That will enable you to use the USB 3.0 port to boot your usb3 external hard disk with Linux installed.
Which flavor of Linux? The video explains how to do this with Ubuntu.
****Please click on Accept As Solution if a suggestion solves your problem. It helps others facing the same problem to find a solution easily****
2015 Microsoft MVP - Windows Experience Consumer

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

Hi all
Connected my new 300 GB Seagate External Firewire Hard Drive today.
Installed Tiger from DVD. Updated to 10.4.3.
Installed Tech Tool Pro 4. Updated to 4.1.1.
Booted from External Firewire Drive.
Disk Utility cannot Verify or Repair internal drive. Does not say or do anything.
Tech Tool Pro cannot repair volume or optimize. Says, "Cannot Unmount Volume."
Is there a fix for this?
Thank you for the help!
Jeff
eMac 800 nVidia. Mac OS X (10.4.3) 160 GB Internal HD. Pioneer Superdrive. 1 GB RAM.

Hi
I did name the new external completely different from the internal.
After booting from the external Firewire Hard Drive, I tried running Disk Utility and Tech Tool Pro from both drives. No matter which drive I run the Utilities from the same things happen every time...
Nothing happens when trying to use Disk Utility to Verify Volume on internal eMac Drive.
Tech Tool Pro says, "Cannot unmount volume" when trying to check Volume or Optimize internal drive.

Why won't my iMac 27" boot from external hard drive?

I have a new 27in Intel i5 dual core 3.6GHz iMac. It works wonderfully.
My question is this. I have a Pleides Ice Cube external hard drive with a USB 2.0/Firewire enclosure with a 500GB hard drive. I used diskutility to format the hard drive as a GUID Partition Table. I then used SuperDuper to clone the iMac OS 10.6.7 and Apps over to it.
I can select the external drive in System Preferences/Startup Disk to boot from, but when booting the iMac gets as far as the white screen then just stops loading.
I have tried both the USB connection and the Firewire connection (with a Firewire 800 to 400 cable).
I have run Disk Utility and repaired the disk and the preferences.
I have used Disk Warrior to rebuild the directory as well, but the iMac will not boot from the drive.
It does boot from the original DVD's and its own hard drive.
My old 24" iMac had no trouble booting from this hard drive or any of the others I have collected over the years, so I am reluctant to think it is the external drive. It is something to do with this particular processor Snow Leopard and external drives.

It sounds like something in the SuperDuper clone might not have copied well. To get the full answer on that I would check with Apple or SuperDuper to see if they support each other.
As a quick test, if you restart and immediately press and hold "option" on your keyboard do you see your external HD as an option to boot from? If so, click it and see if the boot runs any differently, but if you don't see it at all that could show that the problem is more deep rooted.
Personally, if looking in to either of those didn't give me any other info to go on, I would reformat and start the clone again. BTW, do you know for sure GUID Partition is the format you'd want to do this on? Generally macs use "Mac OS Extended" and some external HDs can use "FAT32" (if you want them to work well with Windows)
Hope that gives a little direction
Alex

Booting from a USB drive

I have an urgent problem.
As I had a fatal problem with my orignal MBP It's currently getting repaired. However I have my backup with the latest LION on the timemachine drive!
I can now use my brothers MBP but he's running Snow Leopard and not Lion!
Someone gave me the advise to boot from an external USB drive and like this I could use all my saved stuff on my brothers Laptop without bothering his Harddrive at all!
SO I copied all my stuff to this external USB drive and tried to boot pressing "alt" at the start but my external HD wouldn't show up.
How can I get this external drive to act as a bootable drive?
I have the Timemachine Drive and the USB drive connected to the MBP but I can't boot from either the time machine drive nor the USB dirve!
Please help!!

You need to partiton and format the drive properly for OS X. You then need to install OS X on the drive using a version that can boot the computer.
Drive Preparation
1. Boot from your OS X Installer Disc. After the installer loads select your language and click on the Continue button. When the menu bar appears select Disk Utility from the Utilities menu.
2. After DU loads select the USB 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. Set the format type to Mac OS Extended (Journaled.) Click on the Options button, set the partition scheme to GUID then click on the OK button. Click on the Partition button and wait until the process has completed.
4. Afte formatting has completed quit DU and return to the installer. Complete the OS X installation.
Once you've installed a working OS X that boots the computer you can then go about the task of restoring your software from your TM backup using the Setup Assistant or using Migration Assistant.

Restore Disc Will Not Boot From External DVD Drive

I am using an original MacBook Pro that I decided could use a good restore, and started to clean house. The optical drive is broken, so I am using an external USB drive. I inserted the restore disc that came with the computer (It has OS X 10.4.6 on it), erased my HD, and proceeded to install Tiger. However, setup froze while installing Photobooth, and I was forced to shut down the computer.
I'm trying to get my Macbook Pro to boot from the restore disc that came with it so I can try setup again, but it won't work. If I hold C during the boot, I get a flashing folder with a question mark over it. If I hold option, I get a cursor, but just a blank, gray screen. In both instances, the external DVD drive is active and reading the disc, but I'm not getting any results on the screen. I've also reset PRAM.
If I can just get my computer to boot from the disc, I should be able to get back on track. Thanks.

When I press option during boot, nothing happens. Just a gray screen and cursor, like I described above. I haven't been able to test the external drive yet on another mac to see if it is bootable because I can't find the other computer's boot disc at the moment, but I'll try later with something else.
I have been able to access the drive through Target Disk mode successfully though. Is there something in particular I should do with the files? The folders are:
Applications
cores
dev
etc
Library
OSInstall.mpkg.998YblbM
System
tmp
Users
var
Volumes

Boot from external USB disk

Is there any way to boot from an external USB disk formatted in NTFS or UFS (CD/DVD format)? Basically my idea was to be able to boot the Win7 install image from an USB device. I tried many different ways, I even have my old internal HDD with the boot camp partition in a USB case (I just upgraded to 500GB!! ;)) but I can't in any way boot from USB. Only OSX backup and its installation disk boot fine from an external USB source. Any idea?

It isn't well supported by Microsoft. The problem on Apple hardware is you can't even make changes to the BIOS boot manager.
I have 4 internal hard drives so it is rather easy to boot from one hard drive and run the installer.
You ran into the lack of support for UEFI though which adds another layer and meant most likely having to alter and reburn the ISO to disc with Imgburn or something (and can be done from Windows only so you need a VM).
I got tired of the trouble and work arounds needed though and in the end I just built my own custom PCs - one of which has native eSATA that are bootable (an Intel DX58SO board).
Oh, and it is easy to install Windows 7 on PC, then just move the drive into Mac Pro and boot from there!

Tecra M2: Can I Boot from External USB/Firewire-HDD ???

Hi All,
how can I boot from an external USB Drive ?
The Bios 1.20, 03/15/2004 doesn't seem to support this on my Tecra M2.
I have an Maxtor 300Gig external HDD which can be connected via Firewire or USB. Usually I am using an Firewire PCMCIA-Card to connect this HDD, which has 3 partitions on it.
Would it also be possible, to Boot via PCMCIA-Firewire ?
Many thanks in advance.
Lembong

Hi
As far as I know its not possible to boot from a USB HDD. I know that in some cases its possible to boot from compatible USB FDD and CD/DVD drives but note from HDD.
This theme was disused a lot of time here in the forum.
Please check this other posting:
http://forums.computers.toshiba-europe.com/forums/thread.jspa?threadID=4534&messageID=14824#14824
http://forums.computers.toshiba-europe.com/forums/thread.jspa?threadID=8963&messageID=31325#31325
Regards

All users GONE except for "Other"...and CANNOT boot from External DVD drive

I booted the iMac (Intel...the last one with the White Bezel) tonight, and all of my users were GONE except for "Other." The internal Superdrive has had a disc jammed in it for months, so instead I have an OWC external USB/FW400/FW800 DVD drive. Snow Leaopard.
I need to boot from the SL install disc, but that must go into the external drive...which, as it's been since I upgraded to SL, the Mac sometimes sees and sometimes doesn't. Right now it can't see it. Which leaves me a big pile of crap, doesn't it?
So, what to do? I can't boot the internal drive because it's jammed with a DVD (or I spend $300 to replace what should be a $20 optical drive in it), I can't boot the external DVD drive because the iMac w/Snow Lepeord can't see it, and, meanwhile, all of my photos, etc., are on my Time Machine backup drive...which, as long as I can't do any of the above, just sits there...useless.
Can you tell I'm a bit frustrated with this?
I've reset the PRAM. I've rebooted. I've held down all sorts of combinations of keys. I've tried every single interface type on the external drive and the same thing - the drive can't be seen by the computer.
Has the internal hard drive failed? Nope. I'm tying this using the Firefox browser that's running on my Windows XP installation via Boot Camp on the internal hard drive.

Thanks, but no luck so far.
I have an old iMac G3 downstairs, and I connected it to the machine via Firewire. I could see the disk on the 24" iMac, its folders, etc. I wanted to see if I could install OS X via Target Disk Mode from the old machine to the new one, but it's a PowerPC machine and you can't do that. Maybe you can't do that from ANY iMac...I'm not that experienced.
Now the iMac isn't booting at all to Windows via Boot Camp - it's been booting for 45 minutes now with the "WinXP" logo, but nothing. I'm about to throw it in the car and haul it over to my parents, who have both a Powerbook and a 27" iMac. Maybe it'll work there. Who knows.
Other ideas...replace the internal hard drive (cheap)...if that doesn't work, I'll just sell the thing. I'm not going to sink $300 into the thing when I can get a new machine for around $600-$700. I may go to a Windows7 machine on the desktop and a Powerbook...maybe even an iPad.
I really want to love this iMac. It's my first (well, I did have the G3, but that was just to play with) Mac. It's given me a ton of problems since I bought it new. It's always been a "stock" machine - nothing weird done to it. I was hit with an iMovie update once, and that broke iMovie. Even the new iLife 2009 didn't fix it. Then, the internal optical disk drive failed. I couldn't believe that Apple used a proprietary optical drive rather than a stock Pioneer model. Price for the drive alone? $200.
I installed Snow Leopard 2 months ago, and that completely broke my ability to use external optical drives. Sometimes they work...most times they don't. This is an ongoing problem that many people are having (check the forums)...but no fix. Where does that leave me? With a useless computer.
So, I've boiled it down to this: I love the Mac software. I hate the hardware. Sure, it's pretty, but if something goes wrong, get ready to pay. I hate that Apple knows about problems, yet does nothing to address them, like the problem with external optical drives and Snow Leopard.
I bought the Mac because I was sick of Microsoft not being able to simply produce an OS full of security holes. Often times I read people bashing supposed "driver ****" with Windows, but look at what users of Windows machine are demanding of Microsoft - "please make my software compatible with the trillions of combinations of hardware that can run the os...all the way back to stuff that was created in the mid 1990s." Meanwhile, from my experience, Apple can't get their software to work with their own proprietary, supposedly vertically-controlled hardware.
Windows7 is a not bad OS. It's got it's faults, of course. But, if my optical drive failed in a Windows box, I'd have it replaced in 10 minutes...with a bluray drive...that can write...for under $100.
I use my computer for pictures, etc. In fact, we were ready to send off to iPhoto for our yearly photo books. That's not going to happen, as the photos are forever trapped on my Time Machine backup drive (lesson learned: dump photos to a generic format...fat32 works...just in case you decide to switch from Mac to Win7). iLife is great. MS Office is great, too, on the Mac. I love the little things the Mac does right.
After years of screwing around with my Windows box, I wanted a computer that acted like a consumer electronic device. That's not what I've gotten.
Ugh, so now do I buy a Mac Mini for $700, a new iMac for $1,400, or a Macbook Pro and a mac mini?
...or...do I continue to work within this silly Ubuntu Linux world?
Whatever the answer, I wish I didn't have to ask the question now.

Booting from external USB drive

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