View Full Version : [Resolved] Did I get a dud? Why is my write speeds cap out at 320 MB/s? Is this normal?

Aug 7, 2013, 08:29 PM
I downloaded the Disk Speed Test app by BlackMagicDesign and my speeds will usually average:

Write 320 MB/s & Read 700 MB/s

I've seen reviews talking about both being 700 MB/s, so why then is my write speeds capping out at 320 MB/s? :confused:

Here's an article by a guy who found a massive difference in write speeds between two mackbook air's he got as well (one being a Samsung SSD and the other being a Marvell SSD) (http://blog.macsales.com/19008-performance-testing-not-all-2013-macbook-air-ssds-are-the-same)

Did I get a dud? Should I be concerned about this? Is that write speed normal for others?

Aug 7, 2013, 08:51 PM
If it's the 128gb version it's normal.

Aug 7, 2013, 09:00 PM
If it's the 128gb version it's normal.

Thank you :)

It is the 128gb version.

Aug 7, 2013, 09:16 PM
No prob.

Here's a link as source:


Nothing to do with the brand, simply due to higher density: more speed.

Aug 7, 2013, 11:31 PM
you may have the sandisk model. I believe the samsung can reach over 400 for the 128