In my previous benchmarking of my new HP Chromebook 14 a reader asked if I had tested the units SD speeds. I hadn’t but thought this was a good question because of the limited storage built into the HP Chromebook 14. If the SD card slot was very restricted in terms of I/O performance, the utility of the SD card expansion would be limited. Therefore, I decided to run tests to evaluate the HP Chromebook 14 SD speeds.
To test the SD speeds, I decided to run two tests. Both of these tests were run on an Ubuntu installation via Crouton on my Chromebook One test used the
dd application and another used the
hdparm application. Both tests were run using this SanDisk Extreme Class 10 8GB UHS-1 SD card.
Copying 2GB of data via the dd utility, the Chromebook has an average speed of 49.5 MB/s.
james@localhost:/media/removable/USB Drive$ sudo dd if=/dev/zero of=/media/removable/USB\ Drive/temp.img bs=1M count=2048 2048+0 records in 2048+0 records out 2147483648 bytes (2.1 GB) copied, 43.4108 s, 49.5 MB/s
Using the hdparm utility, the Chromebook had an average read speed of 24.16 MB/sec.
(precise)james@localhost:/media/removable/USB Drive$ sudo hdparm -t /dev/sdb james@localhost:/media/removable/USB Drive$ sudo hdparm -t /dev/sdb /dev/sdb: Timing buffered disk reads: 74 MB in 3.06 seconds = 24.16 MB/sec
It looks like the SD card slot isn’t bus-restricted. Rather, it looks like the card used with the device will largely be the limiting factor. Good news it seems.