Speed Racer

Testing single-board computer storage.

Federico Lucifredi

A few issues back, I examined the infamous label soup that is printed on modern SD cards, exploring the meaning of those arcane runes and the standards they represent [1]. The most common variants of performance speed found in stores today is summed up in Table 1 [2] in order of increasing speed, ranging from the now dated C10 (speed class 10) to the newest A2 (application performance 2). SD cards are advertised on maximum throughput – meaning sequential I/O. This choice is perfectly sensible given their primary application area is to store pictures and video. For computing, however, random I/O is a much more interesting metric. As SD cards careen toward ever faster speeds, it is important to remember that performance is achieved by the combination of the reader…

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ADMIN Network & Security (Digital) - 1 Issue, July/August 2023

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