Why can’t JDL be converted to APFS?

Category : Setup / Operation

If you encounter the error (com.apple.StorageKit error 118) when converting JDL to APFS, please refer to the steps below to 

reformat it before trying to convert again.

 

1. Use Erase to format the JDL device to the Mac OS Extended format (Journaled format) 

and select GUID Partition Map, as shown below.

 


2. Right click the volume and select Convert to APFS....

 

3. Select Convert 


4. JDL volume changes its location to external, as shown below.  


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