wierd hard drive link speed

Drich290195

macrumors 6502
Original poster
Apr 2, 2011
455
1
why does it say under about my mac for the hard drive , link speed 3gb negotiated 1.5gb. its a early 2009 model surely if it supports sata 2 it should have come with a sata2 hard drive shouldnt it.
 
Nov 28, 2010
22,670
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located
Since even the fastest mobile HDDs cannot saturate S-ATA 1.5 Gbps (S-ATA I) speeds, it is kind of unnecessary to put an S-ATA 3.0 Gbps (S-ATA II) HDD in there. I also have a 2009 MBP and put a Seagate Momentus XT and an SSD into it, both get Negotiated Link Speeds of 3 Gbit/s, but only the SSD offers more than 120 MB/s, and S-ATA 1.5 Gbps (S-ATA I) can go up to 148 MB/s or so.

You can find out what your exact HDD is, using a freely available www search engine and the listed model in System Profiler, behind the "Model:" entry.
 

Drich290195

macrumors 6502
Original poster
Apr 2, 2011
455
1
what i mean is im only getting sata 1 speeds out of my current drive yet the macbook supports sata 2
 
Nov 28, 2010
22,670
28
located
what i mean is im only getting sata 1 speeds out of my current drive yet the macbook supports sata 2
Yes, I understand, thus my recommendation to search for your HDD model and also the information, that while HDDs might be S-ATA 3.0 Gbps (S-ATA II) or S-ATA 6.0 Gbps (S-ATA III), they cannot even saturate the S-ATA 1.5 Gbps (S-ATA I) interface, thus making it almost pointless to have such slow HDDs (approx. 120 MB/s maximum for consumer HDDs, 2.5" S-ATA HDDs are even slower) on S-ATA 3.0 Gbps (S-ATA II) interface.
S-ATA 1.5 Gbps (S-ATA I) offers around 150 MB/s, thus it is faster than any HDD, thus S-ATA 3.0 Gbps (S-ATA II) is pointless.
It is late, maybe it is hard to understand, maybe I am too tired to properly explain.
Anyway,
 

robvas

macrumors 68040
Mar 29, 2009
3,044
511
USA
Some SSD's can be flashed to disble auto-negotiation and work at 3.0GB/s. Not that you will notice the improvement...

The NForce SATA chipset in the 2009 Macbook isn't very good.
 

Weaselboy

Moderator
Staff member
Jan 23, 2005
30,177
9,861
California
what i mean is im only getting sata 1 speeds out of my current drive yet the macbook supports sata 2
I think you are fine. My 2008 Macbook Pro was the same. The computer hardware supported and showed the SATA II connection you are seeing, but the factory hard drive was only a SATA I drive.
 

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