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Need Help installing My OS on my SSD I just installed on my Mac Pro.

I will try to give as much detail as possible. I have a stock1 tb hd that runs my os i just installed a 32 gb ssd to run my os. i want to continue to use my hd for applications and everything else. i also installed a 2 tb hd for more storage. I also have a 3 tb external for back up i use it with time machine. If you could please explain to me how to install my OS (Mountain Lion) on this ssd but still keep all my applications and files on my 1tb stock hd.


Please use as much detail as possible.

Mac Pro, OS X Mountain Lion (10.8.4)

Posted on Jul 26, 2013 6:34 PM

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25 replies

Jul 26, 2013 6:46 PM in response to Nzan3

Install Lion/Mountain Lion on a New HDD/SDD


Be sure you backup your files to an external drive or second internal drive because the following procedure will remove everything from the hard drive.


Boot to the Your OS Recovery HD:


Restart the computer and after the chime press and hold down the COMMAND- R keys until the Recovery HD's main menu appears.


Partition and Format the hard drive:


1. Select Disk Utility from the main menu and click on the Continue button.


2. After DU loads select your new SSD (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. Quit DU and return to the main menu.


Reinstall Lion/Mountain Lion: Select Reinstall Lion/Mountain Lion and click on the Install button. Be sure to select the SSD as the destination.


Note: You will need an active Internet connection. I suggest using Ethernet if possible because it is three times faster than wireless.

Now, boot from the SSD to assure it will boot the computer. Open Users & Groups preferences and click on the lock to authenticate. CTRL- or RIGHT-click on the account listed for the SSD and select Advanced Options from the context menu. You will note a field labeled Home Directory: with a button on the right labeled Choose. Click on the button. A file dialog will appear. Locate the Home folder on your HDD. Select the entry and click on the Open button. This will return you to the Advanced Options window. You must now Restart your computer.


After the restart you will be booting from the SSD but using the Home folder on the HDD from which you used to boot.

Jul 26, 2013 7:13 PM in response to Kappy

30 GB is small for a Boot drive, but it can work. Applications operate better when launched from the Boot Drive as well. Mac OS X is said to require a minimum of 9GB of Hard drive space to operate safely.


I run a 30GB SSD as a Boot Drive. I got it for really cheap, and it works fine, BUT -- every SSD should have TRIM Enabler or Chameleon installed and enabled on it, and Installed on your backup System. If you do this, when you run a Disk Utility (Repair Disk) against the SSD, you get an additional line of output, "Trimming unused blocks" and it pauses there while it completes the TRIM for up to a minute.

Jul 26, 2013 8:40 PM in response to Nzan3

Mac OSX can boot from any drive in any bay. The Boot drive is the one last-specified in System Preferences > Startup Disk ... or set automatically by Installing a new System.


DO NOT delete your existing system, Install from scratch onto the new drive and leave the old System alone. Create one Admin user you expect to use ONLY for administration, and leave it on the SSD. Then follow Kappy's last section for specifying where additional Users files will be located (on the second drive) and do not change the name of that drive afterward.

Jul 26, 2013 8:40 PM in response to Nzan3

No. Leave your 1 TB startup drive alone. You have to partition and format the SSD, then install OS X onto the SSD. Boot from the SSD then change the location of the Home folder from the SSD to the Home folder on your 1 TB HDD.


How to use an SSD with your HDD


If you are going to use an SSD as a boot drive together with your existing HDD as the "data" drive, here's what you can do.


After installing the SSD you will need to partition and format the SSD using Disk Utility. Then, install OS X on the SSD. After OS X has been installed boot from the SSD. Use Startup Disk preferences to set the SSD as the startup volume.


Open Users & Groups preferences. Click on the lock icon and authenticate. CTRL- or RIGHT-click on your user account listing in the sidebar and select Advanced Options from the context menu.


You will see a field labeled "Home dir:" At the right end you will see a Choose button. Click on it. In the file dialog locate the Home folder now located on the HDD (HDD/Users/account_name/.) Select the folder, click on Open button. Restart the computer as directed.


When the computer boots up it will now be using the Home folder located on the HDD.


Another more technical method involving the Terminal and aliases is discussed in depth here: Using OS X with an SSD plus HDD setup - Matt Gemmell. This is my preferred approach because I can select which of the Home's folders I want on the HDD and which I don't want. For example, I like to keep the Documents and Library folders on the SSD because I access their content frequently.


Be sure you retain the fully bootable system on your HDD in case you ever need it.

Jul 26, 2013 9:07 PM in response to Kappy

Thanks, that is exactly what I was asking about.


I encounter users baffled by Terminal, but committed to using an SSD, and wanted to know if my old "standard references" regarding moving one Home folder at a time were still good.


http://chris.pirillo.com/how-to-move-the-home-folder-in-os-x-and-why/


Japamac's Blog: Make room for Perormance -- Moving the Home Folder

Jul 26, 2013 9:23 PM in response to Kappy

Link Davis pointed out to me that The Finder will happily copy hidden folders, PROVIDED they are inside a non-hidden folder. Does not work if there are hidden things at Top-level where you are copying from.


So you can copy a whole user_id folder with drag-and-drop, but not the nine or so standard folders inside individually, because Library is hidden (unless you change that, which requires Terminal again).

Jul 26, 2013 9:49 PM in response to Kappy

ok i followed all the directions it works amazing only problem now is i can't find any of my applications i have all my files. Any advice on that? my goal is to have the same exact thing i did when i use my stock hd such as my other users all my programs ect. Other than that its working. Thanks in advance you guys have been such great help.

Need Help installing My OS on my SSD I just installed on my Mac Pro.

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