Results 1 to 7 of 7
  1. #1


    Member Since
    Nov 27, 2010
    Posts
    3
    Momentus XT Issue-Please Help
    I recently installed a 500gb Momentus XT hybrid drive in my MBP. I have noticed improvements in loading of applications and in bootup time. However, when I recently ran Xbench it gave me these results for the disk test portion.

    Disk Test 49.48
    Sequential 113.92
    Uncached Write 126.54 77.70 MB/sec 4K blocks
    Uncached Write 162.33 91.85 MB/sec 256K blocks
    Uncached Read 64.15 18.78 MB/sec 4K blocks
    Uncached Read 183.06 92.00 MB/sec 256K blocks
    Random 31.61
    Uncached Write 9.37 0.99 MB/sec 4K blocks
    Uncached Write 274.42 87.85 MB/sec 256K blocks
    Uncached Read 99.44 0.70 MB/sec 4K blocks
    Uncached Read 163.72 30.38 MB/sec 256K blocks

    All of the tests using 4k blocks are giving bad results. Does anyone know whether this is software or hardware related? Any tips on how to fix this. In addition, I recently installed 8gb of ram in the computer, but I made sure not to knock the SATA connector. Thanks for the help.

  2. #2

    s2odin's Avatar
    Member Since
    Oct 23, 2010
    Posts
    836
    Specs:
    C2D 2.26 | 500GB Seagate Momentus | 2GB 1066 (soon to be 8)
    4k blocks give issues to even SSD's under random r/w speeds.
    USAF E-2. 1C6X1 - Space Systems Operations. 19 days until BMT.
    Upgrade your MBP HD
    Tritton AXPro FS

  3. #3


    Member Since
    Nov 27, 2010
    Posts
    3
    I understood that when I bought the drive, but still, the performance is 10x worse than it was with the stock 250gb drive. Any suggestions for fixing this or could it be a defective drive? The larger block r/w are good, so I don't think it is defective, but I'm open to opinions.

  4. #4

    iggibar's Avatar
    Member Since
    Apr 20, 2009
    Location
    Cleveland
    Posts
    4,079
    Specs:
    4.1 Mac Pro. 15" MBP. 13" MBP. 17" PB. PM G5. iPhone 6S+ 64gb Gold. Apple Watch 42mm.
    You have a drive that requires multiple boots and numerous uses out of apps so that it can learn how you use your drive. Also, speeds fluctuate A LOT. The advertised speeds aren't read/write speeds that you see 100% of the time, they are just peek speeds, which are similar to an ssd showing 275mb/s but only 60-100mb/s random speeds.


    1 thing. Did you restore a the OS or did you put a fresh one on? If you had a fragmented drive previous to restoration, your new drive will be just as fragmented, or possibly worse with new caching.
    “If you are distressed by anything external, the pain is not due to the thing itself but to your own estimate of it; and this you have the power to revoke at any moment.” Marcus Aurelius

  5. #5


    Member Since
    Nov 27, 2010
    Posts
    3
    I cloned my old drive w/CCC to the XT in an external enclosure. I have had the drive installed for several months, I only recently ran the xbench test. After seeing the results I ran Techtool and Disk Utility and found that the volume structure was corrupt. I booted from the Mac OS X install DVD and successfully repaired the drive. However, I am still getting disappointing Xbench results. Would it be a good idea to format and reinstall OS X from my Time Machine backup? Or should I just ignore the results and not worry about them? As I said, it is not noticeable in everyday use. In addition, does anyone know of any other performance test software I could use. When I checked on the Xbench website other MBP users w/ a XT installed had awful 4k r/w block scores. Perhaps it is simply a problem between XBench's methods and the Momentus XT.

  6. #6

    iggibar's Avatar
    Member Since
    Apr 20, 2009
    Location
    Cleveland
    Posts
    4,079
    Specs:
    4.1 Mac Pro. 15" MBP. 13" MBP. 17" PB. PM G5. iPhone 6S+ 64gb Gold. Apple Watch 42mm.
    I did the test with all my hd's and my OCZ ssd. The only one that was faster was the OWC ssd. The stock 250gb that came with my mbp had the slowest times(5400rpm). The other stock hd's running at 7krpm had relatively faster read/write times than the 250gb, but were slower than the XT.

    The only thing I can think of is that maybe you have a lot of misplaced files causing slow test results.

    When I first installed my XT, I needed some of the programs and documents asap the way I left them, so I backed everything up. After I was done with that though, I did a fresh install. I got full start-up to the desktop in 29-33 seconds(completely loaded). With the 250gb, it was around 49 seconds. The OWC ssd starts up in 19-21 seconds consistently.

    Do you get bootup times around 30 seconds with it?
    “If you are distressed by anything external, the pain is not due to the thing itself but to your own estimate of it; and this you have the power to revoke at any moment.” Marcus Aurelius

  7. #7

    harryb2448's Avatar
    Member Since
    Nov 28, 2007
    Location
    Nambucca Heads Australia
    Posts
    21,853
    Specs:
    Imac 27" Retina 3.3GHz, 512GB Flash, 16GB memory, OS X.11.4.
    Personally great believer in registered SuperDUper for backups, but when cloning a drive use Disk Utility's own, and free, Restore program. Go into Disk Utility and hit the restore key. Simply select the drive to be copied, and the target drive and away you go. Perfect every time.

    Moderator chscag and I have discussed previously problems of cloning a boot drive to a new drive. Do a search of the threads.

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Similar Threads

  1. upgrading MBP with a seagate momentus XT
    By jimmyrt71 in forum OS X - Operating System
    Replies: 4
    Last Post: 08-02-2012, 10:27 PM
  2. Need help with a Seagate Momentus XT 750 HD
    By jimmyrt71 in forum Switcher Hangout
    Replies: 0
    Last Post: 08-01-2012, 09:40 PM
  3. seagate momentus xt hd
    By jaybiz32 in forum Other Hardware and Peripherals
    Replies: 3
    Last Post: 06-30-2012, 12:46 PM
  4. seagate momentus xt HD
    By jaybiz32 in forum Apple Notebooks
    Replies: 0
    Last Post: 09-27-2010, 12:51 AM
  5. Momentus 7200.4 Will it work?
    By TheInvsbleMan in forum Apple Notebooks
    Replies: 3
    Last Post: 02-13-2009, 02:20 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •