Dave Johnson on open web technologies, social software and Java
I recently disposed of an old 2010 MacBook pro which died and I decided to take out its 1 TB SSD drive (which I had installed to speed the machine up). I bought a drive enclosure for the extracted SSD so I could use it as an external drive and I decided to do some experiments to see how fast it would be as an external drive. The enclosure has a USB 3.1 port so I figured it might be pretty fast.
I downloaded the Black Magic Disk Speed Test app from the Mac App Store and did some tests. First, I tested against my MacBook's internal SSD disk and got these results:
Mac's main SSD disk
Next, I hooked the old SSD drive directly to my Mac via USB-C and saw that performance was close to what you'd expect from an internal disk. Great!
1 TB SSD connected directly to USB 3.1 port via USB-C
Hooking the old SSD drive up via a USB 3 to USB 2 converter cable slows things down quite a bit:
1 TB SSD connected via USB-C to USB 2 converter
And hooking up via a USB 2 hub really kills write performance:
1 TB SSD connected via USB 2.0 hub
The above is all imprecise and totally unscientific but I think it shows that connecting a fast USB 3 device via USB 2 really slows things down and that a SSD disk connected via USB-C is almost as fast as (my 2016) MacBook Pro's built-in SSD.
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