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iPartition was unable to get write access

If you see the message

iPartition was unable to get write access to the device “SOME DEVICE NAME” (disk0). This may mean the device is write protected, that you do not have permission to access it, or that it is in use by something else.

It means that iPartition was unable to open the specified disk for writing. This could be because:

In the case of background tasks that might be using a disk, the following are particularly troublesome:

In particular, if you get the message

iPartition was unable to get write access to the device “Apple SSD SM0256F” (disk0). This may mean the device is write protected, that you do not have permission to access it, or that it is in use by something else.

it is very likely the case that you are trying to manipulate a disk with one or more active Core Storage partitions, quite possibly a Fusion Drive. Please see this support article if you are in that situation.


Posted by alastair at 2015-Jul-24 15:07:55 UTC. Last updated 2016-Mar-14 15:03:45 UTC.