4 Replies Latest reply: Oct 15, 2013 10:07 PM by Linc Davis
GMac14 Level 1 (0 points)

One of my four internal hard drives is causing considerable SLOW read and write times.  I have a MacPro 2x2.93 Quad-Core with 16GB RAM and with 4 internal hard drives.  The drives were and are: Boot drive WesternDigital 640GB that has recently been replaced by a Seagate 2TB and three equal back up Seagate 3TB 7200rpm drives.  All was running well until I recently upgraded the OS from 10.6 to 10.8.  Now back up drive #2 is performing sluggishly and dragging down my syste.  Drive #2 is slow to open folders, draw icons on screen after opening a new folder, rediculously slow write times with varying file size copying, slows down shut down and boot times.  Shut down time went from 9 secods to over 40 seconds and similar boot up results.  All drives are less than a year old and all 7200rpm.


I have attempted the following:

Moving drive #2 to other slots, rebooting.  (When the problem drive is pulled, everything is speedy and normal)

Running Disk Very and Verify/Repair Permissions.  Came up with "Updating boot support partitions for the volume as required.

Reformatting the drive twice with Disc Utility


I would appreciate any insight on this matter.   I will be caling Seagate to get their take on this issue.  I suspect I will get the finger pointing routine, but hopefully not.


Many Thanks,



Mac Pro, OS X Mountain Lion (10.8.5)
  • Kappy Level 10 (263,335 points)

    It's not your drives. It's your installed system. I would do a reinstall of Mountain Lion as well as determine what other things may be affecting your system. It is possible you may have a defective drive or that the drive was not properly patitioned and formatted.

  • GMac14 Level 1 (0 points)

    Hi Kappy and thanks for the quick reply, however why would the other drives of equal size etc. not act up?  I would think if the OS was the issue, then more than one drive would be affected.


  • Kappy Level 10 (263,335 points)

    I don't know. If it actually is the drive, then there's something wrong with it - defective or failing or not correctly partitioned and formatted. Otherwise, it's the system or data corruption.

  • Linc Davis Level 10 (184,705 points)

    Back up all data immediately as your boot drive may be failing.


    This diagnostic procedure will query the log for messages that may indicate a system issue. It changes nothing, and therefore will not, in itself, solve your problem.


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