Cocoa Unmounting drive but not ejecting it

Question

Do you know you to unmount a drive without ejecting it. NSWorkspace has some methods to unmount drives but it also eject them.

Any idea ?

No, like with the disk utility. You can Mount/Unmount drives but also eject drives. — Matthieu Riegler, Jul 16 '12 at 23:36
What is the difference (if it is not to physically eject a DVD)? — Thilo, Jul 16 '12 at 23:38
https://discussions.apple.com/thread/1545722?start=0&tstart=0 — Thilo, Jul 16 '12 at 23:39
FWIW the diskutil command has separate 'eject' and 'unmount' options. See `man diskutil`. — Thilo, Jul 16 '12 at 23:41
Answer by Vadain on this thread may help you. [This answer is using dynamic path for your volume or say uses generic way](http://stackoverflow.com/questions/34809658/unmounting-drive-volume-without-ejecting/34810198#34810198) — Sahil_Saini, Jan 18 '16 at 05:43

score 3 · Accepted Answer · edited May 23 '17 at 12:15

I am doing it as follows and it un-mounts the drive but doesn't eject it.

(Actually I want to eject the disk, I can only un-mount the disk. :P Please share how to eject a disk.)

DASessionRef session = DASessionCreate(kCFAllocatorDefault);

CFURLRef path = CFURLCreateWithString(NULL, CFSTR("<path_to_your_volume_here>"), NULL);
DADiskRef disk = DADiskCreateFromVolumePath(kCFAllocatorDefault, session, path);

DADiskUnmount(disk, kDADiskUnmountOptionDefault, __unmountCallback, NULL);

This is the code I am still working on and is under development and testing.
I am creating the "path" manually. You can use (and share) a better method to get the path of volume in a generic way. Perhaps this answer has hints of doing it the right way.

I'll update when my development is refined and complete.

Works great. Just had to add the DiskArbitration FrameWork in XCode and in the headfile. And to eject the disk I use : `[[NSWorkspace sharedWorkspace] unmountAndEjectDeviceAtURL:[NSURL fileURLWithPath:device.path] error:&error];` — Matthieu Riegler, Jan 29 '13 at 18:01

score 2 · Answer 2 · answered Jul 17 '12 at 01:48

2

To do this, use DADiskUnmount in DiskArbitration framework.

http://developer.apple.com/library/mac/#documentation/Darwin/Reference/DiscArbitrationFramework/DiskArbitration_h/index.html#//apple_ref/c/func/DADiskUnmount

answered Jul 17 '12 at 01:48

Ken Aspeslagh

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score 1 · Answer 3 · answered May 09 '13 at 14:15

To eject the disk, unmount the disk as you stated, and then in your __unmountCallback do the following:

            DADiskRef disk2 = DADiskCopyWholeDisk(disk);
            DADiskEject(disk2,
                        kDADiskEjectOptionDefault,
                        NULL,
                        NULL);

You can pass any object as context to the DADiskUnmount() and then, for example, use it to determine if the respective disk should be ejected in the __unmountCallback.

Cocoa Unmounting drive but not ejecting it

3 Answers3

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