In my Disk Utility I see five “Apple Disk Image Media” volumes. They all appear to be IOS simulators.
Now, I have done a little IOS development in XCode, but I don’t understand why these images persist after several restarts without XCode, and why there are so many.
When I try to unmount the image, I get:
Failed to unmount "Container disk18" because one or more of its volumes is currently in use.
In use by whom? How can I unmount these images?
Here is the output fro diskutil list:
/dev/disk0 (internal, physical):
#: TYPE NAME SIZE IDENTIFIER
0: GUID_partition_scheme *500.3 GB disk0
1: Apple_APFS_ISC Container disk1 524.3 MB disk0s1
2: Apple_APFS Container disk3 494.4 GB disk0s2
3: Apple_APFS_Recovery Container disk2 5.4 GB disk0s3
/dev/disk3 (synthesized):
#: TYPE NAME SIZE IDENTIFIER
0: APFS Container Scheme - +494.4 GB disk3
Physical Store disk0s2
1: APFS Volume Macintosh HD 12.2 GB disk3s1
2: APFS Snapshot com.apple.os.update-... 12.2 GB disk3s1s1
3: APFS Volume Preboot 8.1 GB disk3s2
4: APFS Volume Recovery 1.2 GB disk3s3
5: APFS Volume Data 414.8 GB disk3s5
6: APFS Volume VM 7.5 GB disk3s6
/dev/disk4 (disk image):
#: TYPE NAME SIZE IDENTIFIER
0: GUID_partition_scheme +17.6 GB disk4
1: Apple_APFS Container disk5 17.6 GB disk4s1
/dev/disk5 (synthesized):
#: TYPE NAME SIZE IDENTIFIER
0: APFS Container Scheme - +17.6 GB disk5
Physical Store disk4s1
1: APFS Volume iOS 17.5 21F79 Simul... 17.0 GB disk5s1
/dev/disk7 (external, physical):
#: TYPE NAME SIZE IDENTIFIER
0: GUID_partition_scheme *1.0 TB disk7
1: EFI EFI 209.7 MB disk7s1
2: Apple_APFS Container disk8 1000.0 GB disk7s2
/dev/disk8 (synthesized):
#: TYPE NAME SIZE IDENTIFIER
0: APFS Container Scheme - +1000.0 GB disk8
Physical Store disk7s2
1: APFS Volume Macintosh Extra SSD 109.7 GB disk8s1
/dev/disk9 (external, physical):
#: TYPE NAME SIZE IDENTIFIER
0: GUID_partition_scheme *2.0 TB disk9
1: EFI EFI 209.7 MB disk9s1
2: Apple_APFS Container disk10 2.0 TB disk9s2
/dev/disk10 (synthesized):
#: TYPE NAME SIZE IDENTIFIER
0: APFS Container Scheme - +2.0 TB disk10
Physical Store disk9s2
1: APFS Volume TimeMachine 230.9 GB disk10s2
/dev/disk11 (external, physical):
#: TYPE NAME SIZE IDENTIFIER
0: GUID_partition_scheme *2.0 TB disk11
1: EFI EFI 209.7 MB disk11s1
2: Apple_APFS Container disk12 2.0 TB disk11s2
/dev/disk12 (synthesized):
#: TYPE NAME SIZE IDENTIFIER
0: APFS Container Scheme - +2.0 TB disk12
Physical Store disk11s2
1: APFS Volume MacintoshData 1.3 TB disk12s1
/dev/disk13 (disk image):
#: TYPE NAME SIZE IDENTIFIER
0: GUID_partition_scheme +17.6 GB disk13
1: Apple_APFS Container disk14 17.6 GB disk13s1
/dev/disk14 (synthesized):
#: TYPE NAME SIZE IDENTIFIER
0: APFS Container Scheme - +17.6 GB disk14
Physical Store disk13s1
1: APFS Volume iOS 26.1 Simulator 17.1 GB disk14s1
/dev/disk15 (disk image):
#: TYPE NAME SIZE IDENTIFIER
0: GUID_partition_scheme +17.2 GB disk15
1: Apple_APFS Container disk16 17.2 GB disk15s1
/dev/disk16 (synthesized):
#: TYPE NAME SIZE IDENTIFIER
0: APFS Container Scheme - +17.2 GB disk16
Physical Store disk15s1
1: APFS Volume iOS 26.0 Simulator 16.7 GB disk16s1
/dev/disk17 (disk image):
#: TYPE NAME SIZE IDENTIFIER
0: GUID_partition_scheme +9.1 GB disk17
1: Apple_APFS Container disk18 9.1 GB disk17s1
/dev/disk18 (synthesized):
#: TYPE NAME SIZE IDENTIFIER
0: APFS Container Scheme - +9.1 GB disk18
Physical Store disk17s1
1: APFS Volume iOS 18.6 Simulator B... 8.8 GB disk18s1
/dev/disk19 (disk image):
#: TYPE NAME SIZE IDENTIFIER
0: GUID_partition_scheme +20.7 GB disk19
1: Apple_APFS Container disk20 20.7 GB disk19s1
/dev/disk20 (synthesized):
#: TYPE NAME SIZE IDENTIFIER
0: APFS Container Scheme - +20.7 GB disk20
Physical Store disk19s1
1: APFS Volume iOS 18.6 Simulator 20.2 GB disk20s1
(Is now a good time to comment on the application icon? Good grief!)
