Home > benchmarking > Using (and booting from) SATA III drive in Mac OSX Lion

Using (and booting from) SATA III drive in Mac OSX Lion

I wondered if I could switch the SATA port from the blue (SATA 3.0Gb/s) to white(SATA 6.0Gb/s) port since my hackintosh has been upgraded to LION so today I did just that and bang I’m on SATA III without any issue. But the weird part is I don’t feel any speed difference. With SATA III

time dd if=/dev/zero bs=1024k of=tstfile count=1024
1024+0 records in
1024+0 records out
1073741824 bytes transferred in 8.016426 secs (133942713 bytes/sec)

real	0m8.030s
user	0m0.004s
sys	0m1.381s

Divide 1024MB by 8 seconds and I got a write speed to 128MB/s on SATA III.

To satisfy my own curiosity, I plugged the hd (a 2TB Hitachi SATA III) back to the SATA II port and ran another write test. And the result turned out to be

time dd if=/dev/zero bs=1024k of=tstfile1 count=1024
1024+0 records in
1024+0 records out
1073741824 bytes transferred in 8.283360 secs (129626362 bytes/sec)

real	0m8.290s
user	0m0.004s
sys	0m1.179s

Which yields a 123MB/s, it’s slower than SATA III but not by much.

Using either port the outcome is pretty close to the results from:
http://www.servethehome.com/hitachi-5k3000-2tb-35-green-drive-silentspin-review-benchmarks/

Advertisements
Categories: benchmarking
  1. Ahmed Adoody
    August 10, 2011 at 4:59 pm

    uh, you need a sata 3 disk to get the full benefits.

    • ricoch3n
      August 10, 2011 at 8:09 pm

      Thanks but my Lios is running on a Hitachi sata III 6.0Gb/s drive.

  2. James
    October 28, 2011 at 1:39 pm

    No traditional hard drive today is limited by SATA transfer speed. The bottleneck is in the hard drive’s own ability to read/write the data, not the SATA interface.

    SSD’s are a different story – modern ones are often choked by a slow SATA interface. Here are some benchmarks comparing 3Gbps (SATA II) vs 6Gbps (SATA III) using a SSD that supports both: http://www.anandtech.com/bench/Product/356?vs=355

    • James
      October 28, 2011 at 1:41 pm

      And if you think that’s fast, look at what SSD’s in raid connected via PCI Express x8 (the same interface that GPU’s use) can do: http://www.anandtech.com/bench/Product/355?vs=430

    • ricoch3n
      October 30, 2011 at 1:51 pm

      Good point on what the true bottleneck is when it comes to he’d speed. My switching sata 3.0 to 6.0 is merely because both my mobo and hds supports sata III. And you can see from my own rough tests confirms that sata is not the deciding factor. Heard about raided SSD before but not sure weather and how well they are supported by Mac Lion.

  1. No trackbacks yet.

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s

%d bloggers like this: