HT201372: Create a bootable installer for OS X
Learn about Create a bootable installer for OS X
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Helpful answers
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May 23, 2016 4:41 AM in response to astrowerxby JimmyCMPIT,the terminal command to format a volume is:
sudo diskutil reformat <volumename>
use at your own risk and remember there is no undo for any problems caused by this the computers doing what it's told instead of what you wanted.
BEFORE resorting to that I would
check to see if the drive is partitoned
check to see if the drive is locked
try reformatting on a Windows PC if one is available then taking back to the mac
and
Always have an up-to-date backup of ALL your data.
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May 23, 2016 4:49 AM in response to astrowerxby Barney-15E,You don't need sudo to format a drive.
You can try using diskutil in the Terminal.
You'll first need to diskutil list to see what the drive identifier is, like disk6
Then,
diskutil partitionDisk disk6 GPT jhfs+ Untitled 100%
However, if it is a CoreStorage volume, then you'll have remove the CoreStorage format, first.
If it is CoreStorage, you'll see a blurb starting with "Logical Volume" below the NAME column.
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May 23, 2016 5:58 AM in response to astrowerxby keg55,Instead of formatting, select the actual drive in Disk Utility (top most line, not indented) and do an erase or click the Partition tab. This will create a single partition with the format you choose.