If your Mac is really old - as in so old it's running Mac OS X Snow Leopard or older - it will not have a Recovery partition, the only way to reinstall the OS is to use the discs that shipped with. Sep 19, 2011 Mac OS Extended (Journaled) - This is the default file system format for Mac OS X drives. Advantages: Formatting your USB flash drive this way will give you full interoperability with Macs. Sep 13, 2015 Since the computer is running a fully operational Internet included clone, you can now download a free copy of Mac OS X 10.10.# from the Mac app store. To accomplish this, launch the Mac app store, press Command-F, type Yosemite, press Enter then press Tab till VoiceOver focuses on the Yosemite download button.
Erasing your disk: For most reasons to erase, including when reformatting a disk or selling, giving away, or trading in your Mac, you should erase your entire disk.
Erasing a volume on your disk: In other cases, such as when your disk contains multiple volumes (or partitions) and you don't want to erase them all, you can erase specific volumes on the disk.
Erasing a disk or volume permanently deletes all of its files. Before continuing, make sure that you have a backup of any files that you want to keep.
How to erase your disk
- Start up from macOS Recovery. Then select Disk Utility from the Utilities window and click Continue.
If you're not erasing the disk your Mac started up from, you don't need to start up from macOS Recovery: just open Disk Utility from the Utilities folder of your Applications folder. - Choose View > Show All Devices from the menu bar in Disk Utility. The sidebar now shows your disks (devices) and any containers and volumes within them. The disk your Mac started up from is at the top of the list. In this example, Apple SSD is the startup disk:
- Select the disk that you want to erase. Don't see your disk?
- Click Erase, then complete these items:
- Name: Type the name that you want the disk to have after you erase it.
- Format: Choose APFS or Mac OS Extended (Journaled). Disk Utility shows a compatible format by default.
- Scheme: Choose GUID Partition Map.
- Click Erase to begin erasing your disk and every container and volume within it. You might be asked to enter your Apple ID. Forgot your Apple ID?
- When done, quit Disk Utility.
- If you want your Mac to be able to start up from the disk you erased, reinstall macOS on the disk.
How to erase a volume on your disk
- Start up from macOS Recovery. Then select Disk Utility from the Utilities window and click Continue.
If you're not erasing the volume your Mac started up from, you don't need to start up from macOS Recovery: just open Disk Utility from the Utilities folder of your Applications folder. - In the sidebar of Disk Utility, select the volume that you want to erase. The volume your Mac started up from is named Macintosh HD, unless you changed its name. Don't see your volume?
- Click Erase, then complete these items:
- Name: Type the name that you want the volume to have after you erase it.
- Format: Choose APFS or Mac OS Extended (Journaled). Disk Utility shows a compatible format by default.
- If you see an Erase Volume Group button, the volume you selected is part of a volume group. In that case, you should erase the volume group. Otherwise, click Erase to erase just the selected volume. You might be asked to enter your Apple ID. Forgot your Apple ID?
- When done, quit Disk Utility.
- If you want your Mac to be able to start up from the volume you erased, reinstall macOS on that volume.
Reasons to erase
You can erase at any time, including in circumstances such as these:
- You want to permanently erase all content from your Mac and restore it to factory settings. This is one of the final steps before selling, giving away, or trading in your Mac.
- You're changing the format of a disk, such as from a PC format (FAT, ExFAT, or NTFS) to a Mac format (APFS or Mac OS Extended).
- You received a message that your disk isn't readable by this computer.
- You're trying to resolve a disk issue that Disk Utility can't repair.
- The macOS installer doesn't see your disk or can't install on it. For example, the installer might say that your disk isn't formatted correctly, isn't using a GUID partition scheme, contains a newer version of the operating system, or can't be used to start up your computer.
- The macOS installer says that you may not install to this volume because it is part of an Apple RAID.
About APFS and Mac OS Extended
Disk Utility in macOS High Sierra or later can erase using either the newer APFS (Apple File System) format or the older Mac OS Extended format, and it automatically chooses a compatible format for you.
How to choose between APFS and Mac OS Extended
Disk Utility tries to detect the type of storage and show the appropriate format in the Format menu. If it can't, it chooses Mac OS Extended, which works with all versions of macOS. If you want to change the format, answer these questions:
- Are you formatting the disk that came built into your Mac?
If the built-in disk came APFS-formatted, Disk Utility suggests APFS. Don't change it to Mac OS Extended. - Are you about to install macOS High Sierra or later for the first time on the disk?
If you need to erase your disk before installing High Sierra or later for the first time on that disk, choose Mac OS Extended (Journaled). During installation, the macOS installer decides whether to automatically convert to APFS—without erasing your files. - Are you preparing a Time Machine backup disk or bootable installer?
Choose Mac OS Extended (Journaled) for any disk that you plan to use as a Time Machine backup disk or as a bootable installer. - Will you be using the disk with another Mac?
If the other Mac isn't using macOS High Sierra or later, choose Mac OS Extended (Journaled). Earlier versions of macOS don't work with APFS-formatted volumes.
How to identify the format currently in use
If you want to know which format is currently in use, use any of these methods:
- Select the volume in the Disk Utility sidebar, then check the information shown on the right. For more detail, choose File > Get Info from the Disk Utility menu bar.
- Open System Information and select Storage in the sidebar. The File System column on the right shows the format of each volume.
- Select the volume in the Finder, then choose File > Get Info from the menu bar. The Get Info window shows the Format of that volume.
If your disk or volume doesn't appear, or the erase fails
- Shut down your Mac, then unplug all nonessential devices from your Mac.
- If you're erasing an external drive, make sure that it's connected directly to your Mac using a cable that you know is good. Then turn the drive off and back on.
- If your disk or volume still doesn't appear in Disk Utility, or Disk Utility reports that the erase process failed, your disk or Mac might need service. If you need help, please contact Apple Support.
Learn more
- If you can't start up from macOS Recovery, you can use a different startup disk instead.
- If Disk Utility shows a Security Options button in the Erase window, you can click that button to choose between a faster (but less secure) erase and a slower (but more secure) erase. Some older versions of Disk Utility offer the option to zero all data instead. These secure-erase options aren't offered or needed for solid-state drives (SSDs) and flash storage.
3 1 like 86,487 views Last modified Jul 24, 2013 3:42 AM
Hello and welcome to my User Tip
As people begin to sell their used Intel processor Mac's problems are occurring when the new owner wishes to wipe everything and make the machine their own due to complexity of reinstalling various OS X versions, AppleID conflicts etc, so I will attempt to clear up the issue and provide concrete procedures you need to follow.
The previous owner is supposed to remove any firmware passwords, erase everything and reinstall the OS X version that came with the machine or OS X 10.6 (if the machine originally came with 10.6, 10.5 or 10.4), but usually this doesn't occur and when the new owner goes to update OS X or reinstall the OS, they are blocked in some manner.
This User Tip is designed to cover Intel Mac's, older PPC processor based Mac's came with their own OS X disks or 10.5 upgrade disks and that's the last OS X version that can run on those machines. 10.5 is currently not supported for security issues etc., so if your using this, use it off the Internet.
OS X boot drives formatting
All OS X boot drives must be formatted in Apple's Disk Utility (as minimal) 1 Partition: Option: GUID and OS X Extended Journaled as the format.
All OS X boot hard drives (not Solid State Disks) should be futher erased with the Security Option: Zero All Data or move the slider one spot to the right, this has a effect of wiping all data off the drive and also eliminates bad sector issues that can prevent a drive from formatting or even installing OS X. It does take some time to complete but it's worth it to prevent drive issues later. If the drive fails the zero erase procedure, it's bad and requires replacement. Be glad to know it now than later on and takes your data with it.
If you require more complicated behind the scenes action then read these
Windows xp x64 sp3.
Identifying the machine
First off if the machine is bootable to OS X, head to the Apple Menu > About This Mac and note the OS X version.
Then do > More Information and write down all what you see there.
What is important is the Model Identifier, the Serial Number and the Memory, get all this written down.
If the machine is not booting into OS X, then you will have to work from the Serial Number located on the outside of the machine or box someplace.
This Apple support document will assist you getting the Serial Number: https://support.apple.com/kb/HT1349
If the machine is hold Command(⌘) r booting into RecoveryHD, or hold Command(⌘) Option/alt r booting into Internet Recovery (connected via Ethernet to router/modem (wired or built in keyboard needed for at boot key commands)
Then use Terminal and enter this command followed by the return/enter. With OS X being tied to a previous owners ID, you likely can't reinstall it.
ioreg -l | grep IOPlatformSerialNumber
Another method to get the profile of the machine is to use Apple's Hardware Test, which in some cases will provide Model Identifier and Serial Number as well as a host of other data about the machine, like the RAM etc. Apple also has links to identify the machine.
Newer machines download Hardware Test from Apple via the Internet, so connect a Ethernet cable (preferred) and press and hold the D key and boot the machine.
If your required to hold the D key down at boot, it takes awhile, so hold on for about 5-7 minutes.
You can try this to see if it works, no big deal if it doesn't, just see the link above and see if older Hardware Test versions will give you the reqired machine information.
This website will assist you in identifying the Model Identifier based upon the last 3 or 4 digits of the Serial Number.
The Model Indentifier looks like 'MacBook Pro 4,1' or similar.
You can also use the following Apple resources for assistance identifying your Mac NoteBook or Desktop:
To determine what OS your Mac NoteBook or Desktop shipped with you can use Mac OS X versions (builds) for computers.
Ok, at this point you should have the Serial Number and the Model Identifier at least.
Wired or built in keyboard needed
If the machine has a built in keyboard (laptops) then your ok, just use that. If the machine has a wireless keyboard, you will need to connect a wired one to proceed further.
A PC keyboard should work, the Windows key is the same as the Apple/Command Key and the option/alt is the same as well.
From now on, use the wired keyboard until your back setup on OS X and can establish a new wireless keyboard.
Reinstall Mac Os X
Checking for a Firmware Password
We need to check to see if a Firmware Password has been set on the used machine.
You can do this by holding Command⌘ V and booting the machine. What will occur differently when OS X is booting is you will see a black screen with a bunch of white text scrolling down and then presented by the log in screen or logging in as normal like before.
If your instead presented with a lock symbol and a request for a password, the a firmware password has been set and needs to be removed first before you can proceed.
You will need the firmware password to remove it, it's the ultimate lock down of a Mac designed for schools and security purposes. However it can be bypassed.
I recommend at this point you take the machine to a local Apple repair or store and have them reset the machine, as it involves doing internal work. Also you might want to take this opportunity to have them check the RAM amount and install more to max the machine of it's capacity to hold RAM, as it will perform better.
As a extra caution, I would bring receipts and proof of purchase of the used machine, because to Apple it technically belongs to another person on their records.
At this point there is no Firmware Password or it has been removed so the at boot key commands will work.
Last chance to backup any files
I do NOT advise TimeMachine being your only copy of your precious users files, make a copy of files to a normal regular external drive.
The reasons for this is TM is designed to restore the current machine owner, and if you come to find out it's all tied to the previous owner, your going to change that and thus may have troubles with TM.
So just having your user files on a external drive you can recover just those in your new setup.
Reformat Required For Use With Mac Os X Update
Disconnect all drives when messing around with Disk Utility and OS X reinstalls to prevent TM from activating and making mistakes.
The quickest way to determine what you can do
Hold the Command⌘ Option r keys down using a wired or built in keyboard and boot the machine on a fast, reliable Internet connection using a Ethernet cable to your router (preferred) or connect using Wifi.
If you load Internet Recovery, then use that Disk Utility to erase the ENTIRE drive of all partitions, check under Partitions that the Partition: 1, Option: GUID and OS X Extended Journaled as the format, give it a name MacintoshHD and apply.
Quit Disk Utility from the file menu and install OS X using your AppleID and password.
This is the tester, if your AppleID and password is accepted and OS X begins installing, then your good to go.
You can upgrade to a later OS X version in AppStore or by calling Apple for the latest OS X version for that machine, they will send you a installer link.
If it doesn't install, it means that OS X version was purchased by the previous owner, you will need the 10.6 install disks.
More complicated OS X installs
Because OS X 10.7 (and up) upgrades are tied to a purchaser, like AppStore software is, they cannot be updated or reinstalled by another owner with a different AppleID and password.
Below is the lowdown on the more complicated OS X installs when Apple transitioned from boot disks to Internet only installs of OS X
If the machine was upgraded from OS X version 10.6.8 to 10.7:
Then using Internet Recovery (if the machine is capable of it) will restore OS X 10.7 as also will Recovery HD partition on the boot drive.
Only the original purchaser of 10.7 from the AppStore can reinstall OS X 10.7 using their AppleID and password.
Other owners will have to reinstall OS X 10.6 first via the appropriate 10.6 install disks, then can upgrade to the latest OS X version the machine supports via AppStore, or by calling Apple and ordering one of the later versions the machine supports and receiving a link to the download
If the machine was upgraded from OS X version 10.6.8 to 10.8:
Then using Internet Recovery (if the machine is capable of it) will restore 10.8 as also will Recovery HD partition on the boot drive.
Only the original purchaser of 10.8 from the AppStore can reinstall OS X 10.8 using their AppleID and password.
Other owners will have to reinstall OS X 10.6 first via the appropriate 10.6 install disks, then can upgrade to the latest OS X version the machine supports via AppStore, or by calling Apple and ordering one of the later versions the machine supports and receiving a link to the download.
If the machine was upgraded from OS X version 10.6.8 to 10.7, then from 10.7 to 10.8:
Then using Internet Recovery (if the machine is capable of it) will restore 10.7 and Recovery HD partition on the boot drive will restore 10.8.
Only the original purchaser of 10.7 from the AppStore can reinstall OS X 10.7 using their AppleID and password.
Only the original purchaser of 10.8 from the AppStore can reinstall OS X 10.8 using their AppleID and password.
Other owners will have to reinstall OS X 10.6 first via the appropriate 10.6 install disks, then can upgrade to the latest OS X version the machine supports via AppStore, or by calling Apple and ordering one of the later versions the machine supports and receiving a link to the download.
If the machine came with OS X 10.7 installed from the factory and upgraded to 10.8:
Then using Internet Recovery will restore 10.7 and Recovery HD partition will restore 10.8
Any owner can install 10.7 from Internet Recovery, but a AppleID and password is required.
Only the original purchaser of 10.8 from the AppStore can reinstall OS X 10.8 using their AppleID and password.
Other owners will have to reinstall OS X 10.7 first via Internet Recovery, then can upgrade to the latest OS X version the machine supports via AppStore, or by calling Apple and ordering one of the later versions the machine supports and receiving a link to the download.
The following machines are capable of installing OS X 10.6:
All Intel processor Mac's prior to 2011 will install OS X 10.6 with the 10.6.3 white retail disks sold online provided the machine originally came from the factory installed with OS X 10.6.2 or earlier.
All Intel processors Mac's prior to 2011 and released with OS X 10.6.3 or later originally installed from the factory require model specific install disks only attained by directly calling Apple and ordering them.
All Mac's sold new after January 2011 until apx July 20, 2011 (when OS X 10.7 was released) require model specific OS X 10.6 (10.6.3+) install disks that can only be attained by calling Apple directly.
Nearly all Mac's sold after July 20, 2011 came with factory installs of OS X 10.7, the firmware will refuse to boot off the 10.6 disks even if they are the model specific ones, however if OS X 10.6 can be put on the drive via Firewire Target Disk mode or removing the drive and using another Mac, then the Mac will boot from it.
How to find out what OS X 10.6 disks to use:
If your unsure of what OS X install disks will work, you can use the Model Indentifier (ex: MacBook Pro 4,2) to consult the free MacTracker as to find out what OS X version originally shipped on that machine (not perfect for 2011) or call Apple and provide the machines serial number.
The machines serial number or model identifier can be located in software or outside the machine: https://support.apple.com/kb/HT1349
Or if you have the machine connected to a Internet you can boot the machine while holding D down for about 7 minutes to load Hardware Test which has a pane at the top to select and provides the information.
How to erase and install OS X 10.6:
Make sure to erase the ENTIRE drive by selecting the drive makers name and disk size at the top, it's so the hidden partitions of later OS X versions are totally erased, thus if you decide to upgrade to later OS X versions via AppStore, they will install the hidden partitions more appropriate for you.
Also if you want to stick with Snow Leopard, the 10.6 install disk version of Disk Utility will be able to properly repair the drive if need be.
More information:
Any non-Internet Recovery capable machines with a new or completely erased boot drive (thus no RecoveryHD partition) will need the appropriate 10.6 install disks or USB thumb drive.
Internet installs of OS X require a fast, reliable, stable and no data capped/restricted size download capability.
All OS X 10.6 disks contain the entire operating system, despite their capability of appearing to upgrade older OS X versions of 10.4/10.5, rather what occurs is the older version is replaced in favor of the newer one, users accounts, files and most programs are left intact.
All OS X AppStore upgrades are also the same, they replace the older version with the newer one, leaving user accounts and most programs intact.
OS X 10.6 white retail disks don't contain the free iLife suite that is on the model specific OS X install disk versions.
iLife can be reinstalled from the OS X 10.6, 10.5 and 10.4 disks or extracted using Pacifist from CharlesSoft, Software Update to bring them current
Free iLife that came on factory installs of OS X 10.7 and up also can be restored if they are not tied to a particular AppleID yet, this occurs if a person buys a 'open box' and the previous customer has returned the machine, the store will wipe the drive of all data, can reinstall OS X from Internet Recovery, but can't reinstall the free iLife. As long as the previous customer didn't accept it in AppStore, it can be reinstalled on the machine by the next owner.
Good Luck 🙂