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Random reads of 512 KB blocks yield the very same ranking as sequential reads. Once again, the SanDisk Mobile Ultra microSDHC is the fastest card at 21.8 MB/s.
Reducing the block size for the random read test to 4 KB significantly impacts performance, which tops out at a mere 3.4 MB/s, achieved by the Samsung and Adata Class 6 cards. There is almost no difference between queue depths of one and 32 when it comes to memory cards.
Randomly writing 512 KB blocks is not a strong suit for microSDHC cards. The three cards that perform best are the SanDisk Mobile Ultra microSDHC, the Adata microSDHC Class 6, and the Samsung card.
Benchmarking random 4 KB writes yields a rather pathetic picture, with the throughput of all but two test candidates dropping to zero-point-zero-something MB/s. In other words, that's just a few KB/s. Only the SanDisk microSDHC card and the Silicon Power card stand out with a queue depth of one. Unfortunately, that's still just over 1 MB/s.