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Please replace all names in the commands below with your original partition names.ĭata copying: You need at least 280 GB free space on your external hard disk to copy your Mac partition. You have to post the output here and i have to adapt my answer If your output looks really different, particularly if you have a Apple_CoreStorage device stop here. SystemExternalDrive is the name of your external system partition (if you have one) SystemUSB is the name of your thumb drive system partition,ĮxternalDrive is the name of your external data partition and WinSystem is the name of your internal bootcamp partition, Where SystemInternalDrive is the name of your internal system partition, The output looks similar to that: /dev/disk0Ģ: Apple_HFS SystemInternalDrive 280.0 GB disk0s2ģ: Apple_Boot Recovery HD 650.0 MB disk0s3Ģ: Apple_HFS ExternalDrive 1,5 TB disk2s2ģ: Apple_HFS SystemExternalDrive 500.0 GB disk2s3 The output looks similar to that: Filesystem 512-blocks Used Available Capacity iused ifree %iused Mounted on Start Terminal in Applications/Utiilities/.You will be booted to the thumb drive now. After a automated restart configure Yosemite.You may have to click Show all partitions if your thumb-drive isn't visible initially. Quit Disk Utility and open Install OS X Yosemite.
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Choose your thumb drive in the left pane and repartition it to 1 Partition, click the Options-button, choose GUID Partition Table and OK, then Apply.Copy Install OS X Yosemite to your external drive.Attach your thumb-drive and copy all contained files & folders to your external drive, then start Disk Utility.