Ask Different is a question and answer site for power users of Apple hardware and software. It's 100% free, no registration required.

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

Presently I am attempting to back up my whole computer's primary hard drive to an ISO file. When I attempt to do this using Disk Utility, I perform the following steps:

  1. Open disk utility and choose the disk I want to create an image from in the left pane.
  2. Click on File->New->Disk Image from "MyDisk"
  3. Then I choose Image format->DVD/CD write master

Disk Utility runs for a long time, then as it nears the end of the operation it gives me the error "Filename too long" and quits.

As an alternative, I attempted to create an ISO file using hdiutil, but receive an error after the file reaches a size of 2 GB:

sh-3.2# sudo hdiutil makehybrid -iso -o /Volumes/Grieg/ChopinSnowLeopard.iso  /Volumes/ChopinSnowLeopard
Creating hybrid image...

hdiutil: makehybrid failed - Operation not permitted

If I try this alternative command, I receive a different error:

sh-3.2# hdiutil create -srcfolder /Volumes/ChopinSnowLeopard /Volumes/Grieg/ChopinSnowLeopard.dmg
diskimages-helper: DI_kextDriveDisconnect returned 268435459 ((ipc/send) invalid destination port).

Does anyone have any suggestions on how to resolve either of these problems? TIA.

share|improve this question
Not an answer to your question, but there is no reason to back up to an ISO file. That is not an optimal file format or backup format for a backup of this size. Why not just clone the drive? – user588 May 26 '12 at 13:07
Thank you--I used a cloning tool and it has worked great! – user89861 May 27 '12 at 16:11

Your Answer


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

Browse other questions tagged or ask your own question.