Agreed.  Power supply is a primary suspect; also bad heat sensor in the drive 
area, or the fan it controls.

On May 14, 2014, at 10:03 AM, Carl Hoefs <newsli...@autonomy.caltech.edu> wrote:

> Gregg,
> 
> I've experienced similar drive failures and the cause for me turned out to be 
> a weak power supply. See if you can test the power supply under load; 
> free-running measurements mean nothing. Or swap out the power supply with 
> another unit.
> HTH,
> -Carl
> 
> 
> On May 14, 2014, at 8:36 AM, "Dinse, Gregg (NIH/NIEHS) [V]" 
> <di...@niehs.nih.gov> wrote:
> 
>> Hi,
>> 
>> Is there some component in a Mac Pro that could fail in a way that would 
>> kill hard drives?
>> 
>> I have been running Mountain Lion (ML) on a 2012 Mac Pro for over a year.  
>> In recent months, it started doing some flaky things, so I decided to do a 
>> fresh install of ML on a different hard drive.  Right after I decided to do 
>> this, the Mac Pro would not even boot from the original hard drive (which I 
>> will call Disk1).
>> 
>> So, I rebuilt my system on Disk2.  This appeared to work for a few days, but 
>> then things got flaky with it (though not exactly the same as with Disk1) 
>> and the Mac Pro also would not boot from Disk2.
>> 
>> Yesterday I reinstalled on yet a third hard drive (Disk3).  In less than a 
>> day, I can't boot from that drive either.  I held down the option key and 
>> booted from the recovery partition.  I ran Disk Utility, it had lots of red 
>> error messages, and it said to save what I could and erase the disk.
>> 
>> I know that hard drives fail, but I find it really hard to believe that 3 of 
>> them would fail in less than a week.  I am now trying a fourth drive, but 
>> I'm not optimistic!
>> 
>> Is there some component in the Mac Pro that could go bad and then "kill" 
>> hard drives?
>> 
>> Thanks in advance for any suggestions that you might be able to offer.
>> 
>> Gregg
>> 
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