Super User is a question and answer site for computer enthusiasts and power users. 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

Where can I view hard disk usage stats on Mac OS X? Specifically it's a SMART enabled SSD (Crucial M4). But hopefully this command and/or app will not be so picky with drive type.

CrystalDiskInfo was recommended but it is not available for Mac or Unix.

share|improve this question
The tool I generally use under Linux or FreeBSD is called hdparm ( ). There seems to be no port of it yet for OS/X, but searching for possible port I found these: and (diskutil part) --- (All not a real answer, so posted in a comment) – Hennes Nov 7 '12 at 17:01
up vote 2 down vote accepted

SMART attribute 09 (Power-On Hours) is the one that tells you how many hours a device has been running. Anything that can dump SMART info should be able to get it for you. There are several utilities for OS X that claim to do just that, including the Linux favorite smartctl.

share|improve this answer
Thanks! I found what I needed earlier, but this answer will likely serve others better. – Ryan Nov 8 '12 at 17:55

Trim Enabler worked for my SSD, but it won't work for HDD.

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.