MBP late 2011; Sata III SSD vs. Sata II HDD

Discussion in 'MacBook Pro' started by bonedaddio, Jan 4, 2013.

  1. bonedaddio macrumors member

    Jan 23, 2009
    PA, USA
    I put a Crucial M4 in the HDD slot, and moved the 750GB stock drive to an Optibay adapter. It's all working, but system profiler sez the negotiated speed on the HDD is half speed. Here's part of the report:
    Intel 6 Series Chipset:

    Vendor: Intel
    Product: 6 Series Chipset
    Link Speed: 6 Gigabit
    Negotiated Link Speed: 3 Gigabit
    Description: AHCI Version 1.30 Supported

    APPLE HDD HTS547575A9E384:

    Capacity: 750.16 GB (750,156,374,016 bytes)
    Model: APPLE HDD HTS547575A9E384
    Revision: JE4AD70E
    Serial Number: J2640054JD39KE
    After some, research, it looks like the main problem here is the HDD itself, it is referred to in reviews as slow, plus it's Sata II (3gb/s) which is what the report is showing... so it's going to have to go, or I'm going to need a larger (512 gb) system SSD.
    I just ran a test using Windows7 (bootcamped) on first the internal HDD in the optibay vs. a Samsung 840 SSD in a Thunderbolt adapter (Seagate GoFlex desktop adapter).
    Photoshop CS6 64 bit opened in 2.5 seconds (from the Win7 SSD).
    Photoshop CS6 64 bit opened in 23 seconds (from the Win7 HDD). REALLY?? Yes, REALLY! Why would Apple put such a dog in a Sata III capable laptop???
    'Nuff said.
  2. bcburrows macrumors 6502


    Mar 25, 2009
    I simply replaced the original HDD with the 750Gb hybrid drive, provides performance and capacity at a price that doesn't bend me over!
  3. robvas macrumors 68030

    Mar 29, 2009
    You're looking at the speed difference between SSD and HD, not SATA II vs SATA III

    A laptop hard drive is barely going to do over 100MB/s, which doesn't even max out SATA I which is 1.5GB/s (or roughtly 150MB/s)

    Putting a spinning hard drive on SATA III isn't going to make it one bit faster than the same drive on SATA II.
  4. NewishMacGuy macrumors 6502a


    Aug 2, 2007
    Be aware that you can't use a SATA III drive reliably in the optibay port of a 2011 cMBP-15. Its a pretty well documented issue on the OWC site.
  5. bonedaddio thread starter macrumors member

    Jan 23, 2009
    PA, USA
    I thought that was an issue with booting??!! I will take a look again, I just want that bay for storage... but that drive is pretty slow.
    Sigh. The larger SSD is starting to look inevitable. (OSX ML partition, Win7 partition with Master Collection on each, plus Lightwave 3D and various support softwares = 512 gb SSD. Ouch.


    Actual testing in this thread:
    Real testing; internal Sata III bus should be similar:
    GoFlex TB adapter, Seagate Sata3 2TB HDD:
    Write: 187 — Read: 183
    It would appear that a spinning hard drive that's actually Sata III would do better than 150MB/s (unless the internal Sata III bus is slower than an external TB ;) ).
  6. robvas macrumors 68030

    Mar 29, 2009
    True - but that's a 7200RPM 3.5" desktop drive. Laptop drives are much slower.

    Either way, watch Activity Monitor and keep an eye on MB/s in disk activity when you are loading apps - peak speed is never reached, you're randomly opening files all over the drive which is where the near-zero seek times on a SSD drive shines.

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