Unfortunately, they make manipulating the partitions more difficult, and take many disk/partition recovery products off the table. That should free them up so the gpt command will stop giving you the resource busy error.įusion Drives use Apple CoreStorage partitions as containers, which is sort of analogous to Microsoft's Dynamic Disks. Of course, nothing is mounted on /dev/disk1 or /dev/disk2, so you will have to issue a diskutil unmountdisk /dev/diskN for those. If you type umount /dev/disk3, that should work. It is the combined capacity of /dev/disk1s2 and /dev/disk2s2. You are absolutely correct that /dev/disk3 is not a 'real' disk. dev/disk0s3), although in your case, you have a Fusion Drive. Typically only partitions are mounted (e.g. Secondly, your umount commands above are failing because /dev/disk1 and /dev/disk2 are not mounted. How could I get rid of this message? I've tried restarting both the iMac and the computer that it is connected to.įirst off, the pdisk command is used to modify drives that are partitioned using an Apple Partition Map. I have the iMac plugged into another computer via thunderbolt, and by holding t when the iMac started up, the Macintosh HD showed up as an external device on the other computer. I've tried with the SSD, /dev/disk2, but I get the same result. The iMac has a fusion drive, and /dev/disk1 is the HDD. dev/disk5 - I have no clue what this is either. I would assume it is the combined HDD and SSD of the iMac.

dev/disk0 - The disk of the computer that the iMac is connected to.

Here's a list of all of the disks connected to the computer, found by running sudo DiskUtil list: I get a message saying that the device is not currently mounted: I've also tried unmounting the device by running sudo umount /dev/disk1 as well as sudo umount /dev/rdisk1. So, I try to see what is using the resource by running sudo lsof /dev/rdisk1, as well as sudo lsof /dev/disk1. Interestingly enough, the I only get a result from /dev/rdisk3:

I also tried running sudo gpt /dev/(r)disk(1-3). I get the same result when using /dev/disk1, /dev/rdisk2, and /dev/disk2. Pdisk: can't open file '/dev/rdisk1' for writing (Resource busy) Once I try running the i command, I get an error message saying that the resource is busy: I am trying to repair a lost HSF+ partition table an iMac by running the i command inside of sudo pdisk /dev/rdisk1.

Os x error could not unmount disk