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 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: 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. To format a Western Digital My Passport external hard drive in ex-FAT or FAT32 format, you can bank on built-in applications of Mac & PC. However, while doing this, there are things you have to keep in mind and follow the correct steps. Once you have done with formatting, your external hard drive will be able to write and read files from both a PC and Mac. The resulting FAT32 file system will be compatible with all versions of Mac OS X, and Windows including Windows 10 back to 95. Due to the differences between a Mac OS X and Microsoft Windows, formatting a drive for Mac only will cause the drive to not be accessible by Windows. Formatting Hard Disk For MacIoreg -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. Mikogo for mac. 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. Formatting Hard Drive For Mac Without ErasingThis 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. 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.
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