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I'm trying to get the old volume feedback noise on my MacBook.

I have a copy of the sound file but the system is refusing to let me replace it, even as root. I found this article that also explained it step by step for terminal but even terminal is giving me problems.

I'm currently on a 2010 13" MBP with OS X 10.11 Beta 5 (15A262e). Any ideas?enter image description here

  • Check perms on the folder you're trying to put it in too. – Tetsujin Aug 20 '15 at 6:34
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The article[1] you have referenced will not work on OS X 10.11 El Capitan (beta versions included). This is due to the new System Integrity Protection (SIP) feature. SIP is intended to protect operating-level system files (in /System and other filesystem locations) from modification, even by a user with root-level privileges.

If you are committed to doing this task, you could try turning SIP off, following the article, then turning SIP back on. Instructions for disabling/enabling SIP are easily found online.

[1] Note that the article does not give any 'date posted' information, but appears to have been posted around Sept-Oct 2014?

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Try using Disk Utility to repair did disk permissions. Open Disk Utility, select your drive, select repair and then click Repair Permissions. This may fix your issue.

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