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<blockquote data-quote="ray5450" data-source="post: 1895995" data-attributes="member: 409464">I need to know how to make and format a partition for OS in recovery mode using command prompt.&nbsp;&nbsp; Currently, other than the recovery partition, there is only free space.&nbsp; The graphic options do not respond/are greyed out.&nbsp; I tried these:This link:&nbsp;&nbsp; <a href="http://www.theinstructional.com/guides/disk-management-from-the-command-line-part-2" target="_blank">Disk Management From the Command-Line, Part 2 - The Instructional</a> gives this example:diskutil partitionDisk /dev/disk2 GPT JHFS+ New 0bUsing that example, I tried:&nbsp; diskutil partitionDisk /dev/disk0 GPT HFS+ OS ObHere is the result:&nbsp; &quot;Ob does not appear to be a valid disk size&quot;The installer needs 6 gb, so I tried:&nbsp; diskutil partitionDisk /dev/disk0 HFS+ OS 6gHere is the result:&nbsp; &quot;Error:&nbsp; 69888:&nbsp; Couldn't unmount disk&quot;I need more clues.&nbsp; Thanks.</blockquote>

[QUOTE="ray5450, post: 1895995, member: 409464"] I need to know how to make and format a partition for OS in recovery mode using command prompt. Currently, other than the recovery partition, there is only free space. The graphic options do not respond/are greyed out. I tried these: This link: [URL="http://www.theinstructional.com/guides/disk-management-from-the-command-line-part-2"]Disk Management From the Command-Line, Part 2 - The Instructional[/URL] gives this example: diskutil partitionDisk /dev/disk2 GPT JHFS+ New 0b Using that example, I tried: diskutil partitionDisk /dev/disk0 GPT HFS+ OS Ob Here is the result: "Ob does not appear to be a valid disk size" The installer needs 6 gb, so I tried: diskutil partitionDisk /dev/disk0 HFS+ OS 6g Here is the result: "Error: 69888: Couldn't unmount disk" I need more clues. Thanks. [/QUOTE]

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