Monitor disk I/O for specific drive in OS X

Posted by raffi on Super User See other posts from Super User or by raffi
Published on 2012-03-26T16:55:26Z Indexed on 2012/03/26 17:33 UTC
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osx

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hard-drive

In my Macbook Pro, I have two internal drives and I've connected a third drive via USB in enclosure.

I am currently doing a secure wipe of the external drive and I was interested in seeing what the disk I/O was for that particular drive, but when I use Activity Monitor I only see the total disk usage for all drives combined.

Is there any way to monitor a specific drive's total I/O, preferably via a built-in or free method? I don't want to filter by process ID. I just want to filter by mounted disk.

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