Is it possible to change OS X's USB filesystem mount behaviour to use the noasync flag to disable write caching?

The aim here is to allow USB devices to be safely removed without eject or hdiutil unmount, as opposed to

1 Answer 1


The answer is no.

In fact, at least with apfs, noasync isn't even an option:

mount_apfs: unrecognized option 'noasync'

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