Ask Different is a question and answer site for power users of Apple hardware and software. Join them; it only takes a minute:

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

When trying to convert or resize a dmg image I get the error:

hdiutil: convert failed Resource Temporarily Unavailable error


hdiutil: resize: failed. Resource temporarily unavailable (35).

(hdiutil error code 35).

share|improve this question
up vote 24 down vote accepted

The problem appears to happen when you unmount the image using umount.

Remount the image (either using hdiutil attach or just double click the image) and use the command hdiutil detach it again. This will unmount and eject the image.

hdiutil detach /Volumes/<your image>
share|improve this answer
The mounted images still appear in "Disk Utility" when you can remove them. – Stefano Palazzo Sep 20 '15 at 1:07

Another possibility is that the disk image is still mounted (from previous work on it). In this case, just select the eject icon.

Afterwards, the hdiutil convert worked great.

share|improve this answer

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.