Lui, Gough (16 de enero de 2014). «SD Card Sequential, Medium & Small Block Performance Round-Up». Gough's techzone. Consultado el 29 de noviembre de 2015. «Variations in 4k small block performance saw a difference of approximately 300-fold between the fastest and slowest cards. Distressingly, many of the tested cards were mediocre to poor on that metric, which may explain why running updates on Linux running off SD cards can take a very long time.»
Kim, H; Agrawal, N; Ungureanu, C (30 de enero de 2012), Revisiting Storage for Smartphones, America: NEC Laboratories, table 3, «Speed class considered irrelevant: our benchmarking reveals that the “speed class” marking on SD cards is not necessarily indicative of application performance; although the class rating is meant for sequential performance, we find several cases in which higher-grade SD cards performed worse than lower-grade ones overall.».
