from sudo diskutil list I get 35 of these

/dev/disk35 (disk image):
#:                       TYPE NAME                    SIZE       IDENTIFIER
0:     Apple_partition_scheme                        +17.9 MB    disk35
1:        Apple_partition_map                         32.3 KB    disk35s1
2:                  Apple_HFS Flash Player            17.9 MB    disk35s2

sudo diskutil umountDisk /dev/disk35 gives a hopeful Unmount of all volumes on disk35 was successful, but if I list it is still there.

Any idea why this happens? and how to get rid of these Flash Player images?

Cheers, Roberto


The disk "Flash Player" is still attached to the filesystem. Go into /Volumes, and you should see it there. There are two ways to proceed, the GUI method, or the command line method. Use whichever you are most comfortable with.

GUI: Navigate to /Volumes and press ⌘ Command+E. This will eject the volume.

CLI: diskutil eject /dev/diskx, in this case disk35. This will also eject the volume.

The difference between diskutil unmountDisk and diskutil eject is that unmountDisk only ceases disk-IO between the disk and the filesystem, but keeps it attached so that it can be mounted later. However, eject effectively 'removes' it from the filesystem, and remounting it may involve physically reconnecting the disk. Think of them as "stand by" and "shutdown" respectively on a computer.

From man diskutil:

diskutil eject

Eject a disk. Media will become offline for the purposes of being a data store for file systems or being a member of constructs such as software RAID or direct data. Additionally, removable media will become eligible for safe manual removal; automatically-removable media will begin its physical (motorized) eject sequence.


diskutil unmountDisk

Unmount an entire disk (all volumes). Force will force-unmount the volumes (less kind to any open files; see also umount (8)). You should specify a whole disk, but all volumes of the whole disk are attempted to be unmounted even if you specify a partition.

  • nothing shown in /Volumes except Macintosh HD – Rho Phi Apr 13 '16 at 11:44
  • still diskutil eject /dev/diskx worked. – Rho Phi Apr 13 '16 at 11:51
  • A little bit of research and live experimenting shows that even though the disk image may be unmounted, it can still be seen in diskutil list. Interestingly, the same behaviour can be observed in hard disks that have been "ejected". Both unmounted/ejected media can still be remounted through diskutil mountDisk, which has me thinking they're still "attached" to a /dev node. – perhapsmaybeharry Apr 13 '16 at 12:17

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