Hot answers tagged disk-utility
Disk Utility can't do it, but iPartition can - http://www.coriolis-systems.com/iPartition.php Tested on both GUID & MBR formatted drives.
This requires the three partitions between the selected one and the intended one to be moved. Disk Utility can't do this without destructively destroying and recreating the partitions in the intended location, removing all data from the partitions. You will need third-party software such as iPartition. For more information, see Partitioning Software.
I know this is an old article, but this recently happened to me and the easiest way to get rid of the Yosemite partition is to: Boot your other OS, mine was Mavericks Open Disk Utility Select the Yosemite partition Select the erase tab, erase it, Select the main drive and go to the partition tab, where you can then delete the Yosemite partition and resize ...
Since the error that showed up the first time was just Can't open (Resource busy), I wouldn't worry about it. It didn't actually do anything the first time. I'm guessing you had a file open or something and it couldn't unmount the volume to repair. I think the reformat message shows up if a repair fails, for any reason, even if it has nothing to do with the ...
Andres's answer is good (Thank you!), and if the first attempt to repair doesn't work, you might have to run it a few times: verify repair verify repair and yes then it did reappear from 'greyed' to 'colour' disk on the side panel. For me to see it mounted, I had to unmount it, pull the USB out and replug it back in.
Go to Disk Utility, select the disk on the left, go to the Erase tab, specify the format as FAT32, enter a name and click Erase.
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