I want to install Yosemite onto an external hard drive, and keep Snow Leopard installed on the internal hard drive. I want to be able to boot from either system, depending upon circumstance (at least until Yosemite is stable). Is this possible?

iMac, Model Identifier iMac12,1 with 121.5" screen, 2.8 GHz Intel Core i7 processor, 8 GB 1333 MHz DDR3 memory, 1 TB internal hard drive, running Snow Leopard 10.6.8 from internal drive.
I want to install Yosemite onto a 1 TB external hard drive (OWC) , and keep Snow Leopard installed on the internal hard drive. I want to be able to boot from either system, depending upon circumstance (at least until Yosemite is stable). Is this possible?

It is possible. I'll let you read some articles that cover the setup:
Starting from an external USB storage device (Intel-based Macs) - Apple Support
or
http://osxdaily.com/2013/06/22/boot-mac-external-drive/

Similar Messages

  • I want to erase everything on the hard drive and have snow leopard which is the operating system now left

    i just brought a laptop on ebay with snow leopard on it and alot of programs i dont want. i want to erase everthing and end up with the snow leopard amd i can buy ilife which i want.

    Erase and Install Snow Leopard
    1. Boot from your Snow Leopard 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 your hard drive (this is the entry with the mfgr.'s ID and size) from the left side list. Note the SMART status of the drive in DU's status area.  If it does not say "Verified" then the drive is failing or has failed and will need replacing.  SMART info will not be reported  on external drives. Otherwise, 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.
    7. After formatting is complete quit DU and complete the Snow Leopard installation.

  • Lost my external hard drive and now Snow Leopard can't find it

    I was doing some maintenance with Onyx (repair permissions, clean caches) and something happened to my external hard drive that I use for Time Machine. Snow Leopard no longer recognizes that the drive exists. It is not listed as a drive in the Mac HD window and is not listed in the Time Machine preference window as a choice for use by Time Machine.
    I have already tried the following: (1) unplugged the external drive and replugged it into the back of my iMac (2) restarted the iMac both with and without the external drive plugged in (3) shut down the iMac and restarted both ways (4) pulled the plug on the iMac and restarted. Nothing works and the drive remains unrecognized. In all the attempts, I can feel that the external drive is spinning and it is still warm to the touch. It appears to be working.
    Can anyone help?

    I am also having similar issues with my Mac Pro (OSX 10.6.3). I have been using a WD external HD for months now with my Time Machine, and I just today realized the drive is not showing anywhere on my Mac and the last backup was on 4/4/2010 (connected via firewire 400 port). Additionally, my old Maxtor drive I previously (not currently) used for Time Machine was also not shown anywhere. I then connected the Maxtor via a USB port instead of firewire, and it will now show in my Disk Utility but will not mount. I ran a "verify disk" on the Maxtor drive and no errors were found. The WD disk cannot be found even in Disk Utility. Getting nervous about my backups.

  • Wiped my entire macbook drive and now snow leopard won't install over snow leopard server, HELP!

    I ordered, what I thought, was Snow Leopard a while ago because I was running Leopard and I wanted to get the app store so I could move onto Lion and then Mountain Lion. I ordered the disc over the phone and the woman sent me the Snow Leopard Server instead of just Snow Leopard, I didn't think much about it so I clean installed it and ran it on my unibody macbook for a while. I didn't see much use for the disc anymore seeing that everything was downloadable at this point, so I sold the disc on Ebay and carried on. The server edition started to slow my computer down due to all of its excess applications and what not, and I read online that Lion and Mountain Lion are also very slow on the old unibody Macbooks so I ordered a regular Snow Leopard disc, now available online, and tried to install it. My computer said Snow Leopard cannot be installed over Snow Leopard server so I went to disc utitlity and wiped my entire drive while the OS X Snow Leopard disc was running and trying to install. I went back to the install window and it still said OS X Snow leopard cannot be installed over Snow Leopard Server so I shut down my computer and tried to turn it back on and I all I got was a blinking folder with a question mark in it, what do I do????????
    P.S. All of my content is backed up on an external harddrive so I am all good with that.

    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 your hard drive (this is the entry with the mfgr.'s ID and size) from the left side list. Note the SMART status of the drive in DU's status area.  If it does not say "Verified" then the drive is failing or has failed and will need replacing.  SMART info will not be reported  on external drives. Otherwise, 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.
    7. After formatting has finished quit DU and return to the installer. Complete the Snow Leopard installation.

  • Can I run Mavericks from an external hard drive while keeping Snow Leopard?

    Hi there,
    I have a Macbook 5.2 which runs ok with Snow Leopard but I was wondering if I should upgrade to Mavericks now. Because I'm not sure how the new operating system will run on my machine I thought I could install Mavericks on an external USB hard drive and boot from there to evaluate if it runs fine for me.
    Not sure if this is possible as I understand that 10.6 and Lion/ML/Mavericks have different filesystems etc... Don't want to upgrade, realise that 10.9 is not running smoothly for me and having to downgrade to Snow Leopard again - which if I remember well what I read a while ago it is not a straightforward operation....
    Any ideas?
    Many thanks
    Mike

    Yes it's possible and quite easy.  However, do not install on a thumb drive - I've tried this with a 16gb and it's slower than a bread wagon with biscuit wheels.
    Now I'm running a lacie external 500gb drive (partitioned) and a firewire 800 cable on macbook pro with Mavericks.  Now it's smokin fast, faster that running my base hard-drive on snow leopard, however the external drive with mavericks osx is still dependent on the guts and performance of the macbook itself.

  • I have a iMac 6,1 that I want to reformat the hard drive and reinstall Snow Leopard version 10.6.3 . I don't know how to reformat

    I have a iMac 6,1 that I need to reformat the hard drive and reinstall Snow Leopard version 10.6.3 . How do I reformat ?

    Boot the ssystem from the OS DVD. Once it is booted run Disk Utiltiy. Select OS Extrended (Journled)
    See http://support.apple.com/kb/HT3910?viewlocale=en_US&locale=en_US

  • Install Leopard on an External Drive on a Snow Leopard Mac Book Pro

    Hi
    I have a MBP 17/CTO 2.66GHz i7, which came installed with Snow Leopard.
    I've used boot camp to install Windows 7.
    I've attempted to install Leopard 10.5.4 on an external drive.
    The steps I've taken:
    1 - Connected my WD Passport on the Firewire Port
    2 - Partitioned the drive. The first partition is 100GB, Mac OS/X Extended (journal) and I've selected the GUID Partition Scheme
    3 - Inserted the Mac OS/X Leopard DVD, and followed the instructions to restart
    4 - On restart I have three options. Mac OS, Windows and Install Mac OS\X
    5 - I select Install Mac OS\X.
    6 - The disc spins for a few moments and then the laptop freezes
    Beware of the following issue:
    1 - On restart more often than not, the DISC will spin and then the laptop will freeze.
    2 - To overcome this, restarting pressing the ALT (option) Key.
    3 - You should see your boot options. If you do not see "Install Mac OS\X", then eject and reinsert the disc.
    The question maybe why would I want to have an Leopard Installation when I have Snow Leopard. The software I develop has thrown up a number of differences between Leopard and Snow Leopard, hence I need both OS's to support my software.
    I mentioned this to the Apple Store before I purchased my machine. They put me through to a senior technician at Apple Care, who told me it would be possible to have the set up I am after; and to contact Apple Care if I ran into any difficulties.
    After I received my laptop and ran into the problems I described above I contacted Apple Care, only to be told by a senior technician that it should be possible to install Leopard on an external drive, but Apple Care cannot provide any support or assistance.
    I really do like the laptop and would much rather not return the laptop; but I really do need the setup described.
    Anyway I have tried a number of different approaches:
    1 - Having no partitions (so just the single partition)
    2 - Trying all three Partition Schemes:
    - GUILD Partition Table
    - Apple Partition Map
    - Master Boot Record
    All resulting in the same problem.
    I can confirm the external drive does appear as bootable in disc info.
    My guess is one of the following is preventing the install:
    1 - It is simply not possible to install an earlier version of Mac OS\X than 10.6 on the laptop I have, even if I tried to install on an external drive. This restriction is built into some hardware confirguration. So even if I wiped the internal hard drive or added a new partition to the internal hard drive, I would not be able to install 10.5.4. I say this may be a reason as the second technician told me the CPU has built into it a process which prevents installing older versions of Mac OS/X, but that it should NOT restrict installation on an external harddrive.
    2 - When trying to install Mac OS/X, a search is carried out for an external drive which has the correct format. For some reason it may be that this search is not finding my external drive?
    I'm a little stuck here and quite disapointed that the support promised by Apple Care for assistance in setting this up, is now not forth coming.
    Any help or suggestions would be appreciated, as ideally I would prefer to keep and not return the laptop, it's a beautiful piece of machinery.
    Cheers
    Parmy

    The mystery continues...
    I have an older MBP (2.33 GHz Intel Core Duo) which came installed with Tiger. I can confirm I purchased a genuine copy of Leopard (10.5.4) from the Apple Store and it’s not an OEM version. I installed 10.5.4 without a hitch on my old MBP internal drive. It is the only OS installed on my old MBP.
    Using my older MBP (which through software updates is now running 10.5.7), I managed to install 10.5.4 onto my external HD (WD My Passport Studio – 640GB FireWire 800).
    However; on the final restart, the screen remained grey and 10.5.4 did not boot from the external drive.
    I restarted the machine holding down the ALT (option) key, and only two options appeared, Macintosh HD and the Install DVD. I selected the Macintosh HD and opened System Preferences.
    In System Preferences --> Startup Disk, I discovered the partition on my external HD which contains 10.5.4. I selected this partition and selected restart.
    On restart my MBP displayed a grey screen, and the blue light on my hard drive flashed slowly. I left this for an hour, however; the OS did not start and the screen remained grey.
    I then plugged my external HD into my new MBP which I started holding down the ALT key.
    To my surprise I found 3 boot options (Macintosh HD, Windows and Leopard). Leopard being the partition on my external drive, which now has 10.5.4 installed.
    I selected Leopard, but sadly after 30 minutes, the OS failed to boot.
    Although this deviates slightly from this post, I fail to understand the problem here:
    1 – Why can’t I boot 10.5.4 on an external drive, from my old MBP? Surely this is not because my old MBP is now running 10.5.7?
    2 – Why can I see 10.5.4 as a boot option on my new MBP but not on my old MBP when I start the MBP holding down the ALT key?
    I doubt there is a problem with my external drive, as it seems to read, write, etc... in all normal cases.
    Whilst it definitely appears that I won’t be able to boot 10.5.4 on an external drive from my new MBP, I should be able to at least boot it from my old MBP, which would give me the option of installing Snow Leopard and Windows on the internal drive of my old MBP.
    Apologies for keeping this post going, but I hope by getting to the bottom of this, it will help other Mac users as well.
    I’ve run out of ideas of things to try, so I will give Apple Care another call in the morning, and will report back.
    Any suggestions of other things I can try?
    Cheers

  • Installing Mountain Lion from Snow Leopard, Install failed and HD write-locked

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    Mid installation, the installer stopped and said that the installation failed and that I need to repair my disk. So I restarted the computer and I ran disk utilities (my start up disk was the OS installer and the installer allows me to run several programs, including terminal, disk utilities, and by the way, when I held option while starting up to see which start up disks I have, I only had the OS installer as the start up disk. Also, the installer allows me to run a program called "Startup Disk" when I click on the apple logo on the top left corner, but it doesn't allow me to startup my computer using Macintosh HD) and noticed that when I highlighted Macintosh HD, my "Repair Disk" button was grayed out. So first things first, I ran the "Verify Disk" button but after a minute or so, Disk Utilities said that verification failed and that Macintosh HD needs to be repaired. But the "repair disk" button is grayed out! So I went to the Mountain Lion installer again and ran it. Of course, it failed again so I restarted the computer.
    So I tried to first back up all files in Macintosh HD to an external hard drive using Disk Utilities, and I used features such as "New Image" and "Restore" but they both ended up in "Input/Output error". I tried many methods with Disk Utilities but they resulted in errors.
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    b. will my computer allow me to erase (or format) Macintosh HD?
    c. will my erased/formatted Macintosh HD able to install + be installed Mountain Lion OS?
    If you are here, then you have read my long long problem. Thank you very much and I would really really really appreciate your answers and opinions. Thanks

    I'm not sure where you read that about the disk being "write-locked." That doesn't make much sense, given that the major task an installer like this must achieve is writing a whole bunch of files to the hard drive. I think your source was mistaken.
    As to what happened, it sounds like your hard drive was badly corrupt to start with, or possibly was on the edge of failing and is now in the process of dying entirely. If you don't have backups of your data, that does not bode well for you, unfortunately. If you can manage to use target mode to copy your data, do that.
    Once you're sure you've got all your data, you need to start up from your Snow Leopard install disk and repair the hard drive. (Since it sounds like the Mountain Lion installer didn't work, I wouldn't trust the recovery partition that Mountain Lion installs.) Or, even better, just erase the hard drive entirely and reinstall Snow Leopard. Then, once you're back up and running, with all your data back on the system and with Snow Leopard updated to the most recent version, try installing Mountain Lion again. If any of that fails again, the problem is likely to be a dying hard drive, and you'll need to replace it.

  • The internal hard drive on my early 2009 24" iMac is nearly full.  How do I add an external drive so that it functions just like the internal drive on the iMac?

    The internal hard drive on my early 2009 24" iMac is nearly full.  I have already worked to free as much space on the HD as possible.  How do I add an external HD and have the iMac read it as though it was part of the internal HD.  I know about external HD for additional storage and I do have an external HD, but, it is so much easier to search the drive when it is internal than having to perform a search on the internal drive and then a search on the external drives.  And, it is easier to save files to an internal drive so that I don't have to decide which external drive to use to save files.  In other words, I want to add an external HD and have it function as though I had purchased a larger internal HD.

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    For basic definitions and discussion of what a RAID is and the different types of RAIDs see RAIDs.  Additional discussions plus advantages and disadvantages of RAIDs and different RAID arrays see:
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    RAID Hardware is always a disk controller to which you can cable up the disk drives. RAID Software is a set of kernel modules coupled together with management utilities that implement RAID in Software and require no additional hardware.
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    For more detailed information on the differences between Software RAID and Hardware RAID you may want to read: Hardware RAID vs. Software RAID: Which Implementation is Best for my Application?

  • Problems with Booting from the Snow Leopard Install Disc

    I need to do a reformat of my iMac drive and reinsall Snow Leopard.  Then I want to run System Migration and move the contents of my Mac Pro (running Snow Leopard) over to the iMac.
    I placed the retail Snow Leopard installation disc and held the "C" key down during restart.  My optical drive make a bit of random noise and eventually ejects the SL disc.  I've tried a CD, movie dvd and another software program installation disc and none of them seem to be able to be read.  I've sold the Mac Pro and am in a bit of a bind as I need to get this done and shipped out.  I'm also going to have to wipe the Mac Pro drives clean and do a reinstall of Snow Leopard.
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