Most of my Googling, referred to a spinning wheel related to Safari. No solution until now!
1. Open Applications\Utilities\Terminal to type some commands.
2. To find out which applications are taking up your CPU time, type:
top -o cpu
3. At the top of the list, should be the application taking your CPU time. In my case it was mds.
4. To kill the process, type:
sudo killall mds
<type your password>
After that, my disk drive stop making all that noise! What a relief!
While you’re at it, you might consider disabling Spotlight. I don’t understand why it make my hard drive go crazy if it has had so much time to create an index for each hard drive.
To disable Spotlight, type:
sudo mdutil -a -i off
What Failed, sometimes Me
Wrong Top Sort
Along the way I tried finding the process that used the CPU the most. I had accidentally set top to sort by process id (pid) so it never gave me the correct answer. Looking at the man page, the above top command with -o cpu always sorts by CPU usage.
After searching online, I found out that Linux uses iotop to find the process using the hard drive most of the time. Fortunately, under the Mac OS X, it also exists. But when I ran
for a while, it would insert an error and prevent the proper culprit to show up in the list.
dtrace: error on enabled probe ID 5 (ID 19321: io:mach_kernel:buf_strategy:start): illegal operation in action #3 at DIF offset 0