Test disk Speed (Ubuntu, OSX for reference)
dd utility to measure disk speed for 500mb, 1gb, 2gb r/w. Mac OSX version for benchmark.
wget https://raw.githubusercontent.com/psu-hacking/iso-gen/master/additional/speedtest.sh # wget https://raw.githubusercontent.com/psu-hacking/iso-gen/master/additional/macspeedtest.sh chmod u+x speedtest.sh sudo ./speedtest.sh
early 2015 Macbook Pro
- On OSX, ~ 1gb/s r/w is consistent for 500mb --> 2gb.
- Glyph Dual SSD, RAID 0, USB "C 3.2" (10gb/s) --> USB 3 "A 3.1" (5gb/s, Macbook Pro hardware)
@ 500mb, r/w is ~ 800mb/s.
@ 2gb, r/w is ~ 500mb/s.
- Samsung NVMe "Plus" in USB "C 3.2" (10gb/s) enclosure --> USB 3 "A 3.1" (5gb/s, Macbook Pro hardware)
@ 500mb, r/w is ~ 2.5gb/s - 3gb/s.
@ 2gb, r/w is ~ 1gb/s, though variance is greater (+/- 500mb/s, thermal performance may begin to limit speed)
- Sandisk USB thumb-drive, USB "A 3" --> USB 3 "A 3.1" (5gb/s, Macbook Pro hardware)
Not fully tested; generally speeds are limited to 10mb/s.