The Combo Update is a fuller install, as opposed to an incremental 'delta' update, so it should overwrite any files that are damaged or missing. It does not matter if you have applied it before. It should preserve all your data and settings, but that said you should always have a backup. Oct 26, 2013 So I started to fiddle with terminal with an idea in mind, then I found a way to force the installation without a single patch, the installation DVD/USB key/DMG/partition/whatever stays 100% untouched. Just let the installer boot as usual, once the interface pops, it will quickly say that OSX can't be installed on this mac. Just click.
Update: Go to Install macOS Sierra Using Bootable USB Flash Drive if you want to install macOS 10.12 Sierra instead.
Update 2: The instructions below will work to manually create a Mac OS X 10.11 El Capitan USB installation drive. I needed to upgrade my sister’s 2008 Macbook Pro and found that the existing Mac OS X 10.6 Snow Leopard did not support the “createinstallmedia” tool; I got a “Failed to start erase of disk due to error (-9999, 0)” error. I followed the instructions below to successfully create a bootable installer for Mac OS X 10.11 El Capitan, which is the last version to support the 2008 Core 2 Duo Macbook Pro.
Nov 21, 2018 Since the Basesystem.dmg is a file that contains some form of MacOS installer, it may only pretend it is such to fool users. In reality, the infection file of this virus is believed to be spread via e-mail by being uploaded as a seemingly legitimate document of what appears to be an important nature. Nov 02, 2013 IMPORTANT: Select the automatically created partition of the USB drive not the drive itself (shown in the sidebar). If you select the USB drive instead of the partition you will get this error: Restore Failure – Could not restore – Resource busy. Select the Restore tab. Drag the BaseSystem.dmg file into the “Source” field.
In this post, I will go over instructions on how to create a bootable USB flash drive containing the Mac OS X 10.10 Yosemite installer. These instructions will also work for Mac OS X 10.9 Mavericks (excluding a Yosemite-specific step) and differ significantly from the instructions for creating a Mac OS X 10.6 Snow Leopard installer. You will need an 8GB USB flash drive for Mac OS X Yosemite or Mavericks.
I tried several methods which failed to create a bootable USB flash drive before finding one that succeeded. The instructions I found that worked, using Disk Utility, were located at How to Make a Bootable OS X Mavericks USB Install Drive and How to Create a Bootable Install USB Drive of Mac OS X 10.10 Yosemite.
Download the Mac OS X 10.10 Yosemite
First, download the latest Mac OS X version, which is 10.10 Yosemite. It is the version currently available for download from the “App Store”. (If you want an earlier version like Mac OS X 10.9 Mavericks, you’ll need to get it from elsewhere.)
Base System Dmg Cannot Be Found Free
Launch “App Store” and search for “OS X Yosemite”. Download it. (It is 5.16GB in size.)
Note: If you run the Yosemite installer to upgrade your Mac, the downloaded installer file will be deleted automatically after the upgrade is completed. To keep that file, you will want to move it out of the Applications folder so it won’t be deleted after an upgrade. Launch the “Terminal” app and run this command to move the downloaded installer app to your user’s “Downloads” folder:
sudomv/Applications/Install OS Yosemite.app/ ~/Downloads/
Create Bootable USB Flash Drive Installer
By default, the Finder will hide system files which we will need to see. Run these commands in the “Terminal” app to expose the hidden files:
# Configure Finder to show hidden system files. defaults write com.apple.finder AppleShowAllFiles TRUE # Close all Finder instances (and re-launch so settings take effect). killall Finder
Prepare the USB flash drive:
Plug in a USB flash drive of size 8GB or larger.
Launch the “Disk Utility” to format the USB Flash drive.
On the left-hand pane, select the USB drive (not the partition under it, if any).
Click on the “Erase” tab, select “Mac OS Extended (Journaled)” for “Format” and input a name like “Install Yosemite” (or anything because this name will be overwritten later).
Click the “Erase…” button at the bottom and then the “Erase” button in the popup dialog. This format operation should take less than a minute to complete.
Restore the Yosemite installation image to the USB flash drive:
Launch the Finder and locate the “Install OS Yosemite.app” file. Right-click (hold the “control” key and click) on it and select “Show Package Contents”.
Open Contents, then SharedSupport, and double-click on the InstallESD.dmg (disk image) file to mount it. A volume called “OS X Install ESD” will show up on the desktop and under DEVICES in the Finder.
In the “OS X Install ESD” volume, right-click on the “BaseSystem.dmg” file and select “Open” to mount it. (Double-click won’t perform any action because it is a hidden file.)
Use Disk Utility to clone the “BaseSystem.dmg” to the USB flash drive:
Select the “BaseSystem.dmg” in the left-hand pane and click on the “Restore” tab. The “Source” field will be populated with “BaseSystem.dmg”.
Drag the “Install Yosemite” partition under the USB flash drive to the “Destination” field.
Click the Restore button and then the Erase button.
The USB flash drive will be written with the contents of “BaseSystem.dmg” file. Depending on the speed of your USB flash drive, it may take several minutes or longer to complete this operation.
Once complete, the “Install Yosemite” partition will be renamed to “OS X Base System”.
Use the Finder to navigate to the USB flash drive. You will see two “OS X Base System” volumes in the Finder’s left-hand pane. The USB flash drive is the last one.
Under the USB flash drive’s “OS X Base System” partition, open the “System/Installation” folder. You will see an alias file named “Packages”. Delete it because we will replace it with a “Packages” folder below.
Use a second Finder window to open the “OS X Install ESD” volume. (To open a second Finder window, you can use the Finder menu’s “File/New Finder Window” command.)
Copy the “Packages” folder from the “OS X Install ESD” volume to the USB flash drive’s “System/Installation” folder.
Required for Yosemite (not required for Mavericks): Copy the “BaseSystem.chunklist” and “BaseSystem.dmg” files from the “OS X Install ESD” volume to the USB flash drive’s root “/” folder. If you don’t do this, you will get an “undefined error 0” when attempting to install Yosemite.
The USB flash drive is now complete. You can use it to boot a Mac to install Mac OS X 10.10 Yosemite.
Unmount all the Yosemite installer volumes by ejecting them; you must eject “OS X Base System” before “OS X Install ESD”.
Re-configure the Finder to hide system files. Run these commands in the “Terminal” app:
# Configure Finder to not show hidden system files. defaults write com.apple.finder AppleShowAllFiles FALSE # Close all Finder instances (and re-launch so settings take effect). killall Finder
Boot With USB Flash Drive
To boot a Mac with the USB flash drive:
Insert the USB flash drive.
While holding the “option/alt” key down, turn on the Mac to display the boot Startup Manager.
You should see one or two icons, one for the internal hard drive and/or another called “OS X Base System” for the USB flash drive. (The internal hard drive may not be visible if it does not have a bootable partition installed.)
Note: If you don’t see the USB flash drive’s “OS X Base System”, try removing and re-inserting the USB flash drive while viewing the Startup Manager screen. The USB flash drive should then appear after a few seconds.
Select the “OS X Base System” and hit the “return/enter” key to boot from the USB flash drive.
Hopefully, this post will help you to create your own bootable USB flash drive installer for Mac OS X 10.10 Yosemite or Mac OS X 10.9 Mavericks.
On every OS X Lion installation a hidden partition is created to enable a method for Lion to be reinstalled on the machine, it is known as the recovery partition or drive and is 650mb in size.
If you bought a new machine from Apple you have OS X 10.7 already installed – but no back up disk! and since you haven’t bought the OSX Lion 10.7 App from the App store you can’t re-download it – so thats why you have the recovery drive as a partition in your main hard drive and to boot from it you need to restart the machine holding down “command” + “r” keys.
From recovery mode you can run Disk Utility, get online help and do a restore from a Time Machine backup and re-install Lion leaving all your other files intact – it just replaces the core operating system.
You can make a bootable USB drive or disk of the recovery drive, but involves a small trip to the Terminal….
1) Launch Terminal from /Applications/Utilities and run:
The primary drive in this list is No.2 with the “Identifier” of disk0s2, the boot recovery drive is disk0s3
We can also identify the recovery drive by the name and the size – set at 650mb
2) Mount the drive:
Output should be:
Now the Recovery HD is mounted in the Finder and you can see it in the sidebar under Devices Navigate to it from the sidebar – Recovery HD/com.apple.recovery.boot/BaseSystem.dmg.
3) Doubleclick BaseSystem.dmg to mount it also in the sidebar. This will mount the volume ” Mac OSX Base System”
mac-osx-lion-base-system
4) Open Disk Utility in /Applications/Utilities
5) Put in a 2GB+ USB drive, let Disk Utility load it. The USB drive needs to be formatted as Mac OS Extended Journaled, if its not, its time to format it in Disk Utility…
6) Finally in still in Disk Utility, select the “Restore” tab – drag the mounted volume “Mac OSX Base System” into the Source field and drag the USB drive “Volume” (mine is called SuperBootUSBDrive) to the Destination.
restore-volume-osx-usb
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7) Click Restore – 25 minutes later – One bootable USB drive
Your bootable USB drive will be called “Mac OS X Base System” after the restore is complete. Now to boot from it just select it as the Start Up disk in System Preferences or hold down option key on boot and select it from the choice of bootable devices.
Basesystem Dmg Cannot Be Found Youtube
If you have downloaded the Lion App from the App Store then you can also make a boot disk/drive from this, guide is here, you need to make the boot drive/disk before you install the Lion App, as the installer is deleted after running it. Thats why the guide here can get you out of trouble.
Couple of footnotes on this – Apple has released a knowledgebase article about the recovery partition, also just released from Apple is an app that will do the same as above.
Update For Newer Models – hidden BaseSystem.dmg
If you have the latest models from Apple that came already shipped with OSX 10.7, then you may not have the “BaseSystem.dmg” but instead see a “BaseSystem.chunklist” , the “BaseSystem.dmg” is there it’s just hidden.
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To show it so you can see it in the finder – go to Terminal – enter: