Micro SD card performance with different adaptor

There are several way to connect a micro SD card to a PC. The most popular being a versatile USB card reader that is capable to read different storage media. There are also built-in card reader on notebook computer.

Since the Android phone supported USB external media via OTG interface, there is a new kind of micro SD adapter on the market that work with both mobile device and PC, and are made very compact like the one on the right below.

sdcardmarkanova3

To compare whether there will be difference in access speed, a simple test is performed using CrystalDiskMark with the two adapter devices above. Three groups of 10 sample read data (an internal SD reader of a notebook computer, a standard USB interface, and a USB 3.0 interface) are collected for the same micro-SD card which is a SanDisk 32GB class 4. The data are analysed using the ANOVA function available on the TI-84.
sdcardmarkanova1

Looking at the p-value, there is a significant difference between any of the mean reading speed.
sdcardmarkanova2

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