Take a look at this screenshot of system profiler:īoth Link Speed and Negotiated Link Speed is at 3 Gigabits. It might be the case that system instability occurs only when transfer rates are closer to theoretical limits of SATA2 controller. All I can say is that although this SATA2 drive is noticeably faster than my original SATA1 HDD, neither of these drives achieve speeds even close to theoretical limits of SATA1 (1.5Gbits) let alone SATA2 (3Gbits).
Now let’s check the results for SATA2 drive:Īs you can see, there is a major improvement in transfer rates which maybe attributed to many things – newer HDD, larger cache etc.
Unfortunately I forgot to capture the results of test on my original Hitachi drive, but if you’re willing to take my word for it, transfer rates for reading were around 40MB/sec and for writing it was a little bit less. If I did something wrong please let me know. Default results were used to test the speed and the first cycle of test was captured in screenshot. If you know a better alternative, please let me know and I’ll do another test and provide you with results. I can’t comment on how accurate are the results produced by this program, but I’ve seen it used often in youtube videos to test the speed of HDD/SDD.
I did try testing the speed of this HDD using BlackMagic Disk Speed Test software which is available from AppStore for free. Waking up computer from sleep didn’t result in any freezes. System seems a little more responsive compared to what it was when using original Hitachi drive.Īs some users in forums suggested I tried copying several gigabytes of data to and from WD HDD, while simultaneously watching HD videos and didn’t notice any slowdowns. So far I did not experience beachballing, freezes or any other problems which might be related to the issue I talked about in my original post (knocks on wood!).
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