Samsung MB-MP8GB
man:0x00001b oem:0x534d name:00000 hwrev:0x1 fwrev:0x0

https://github.com/hglm/flash-bench

pi@raspberrypi ~/flash-bench $ sudo ./flash-bench
Using test file flash-bench.tmp (using all 512MB).
Benchmark: Sequential read  Limits: Total size: 512MB Duration: 60s
512.0MB processed in 30.03s (17.05MB/s), CPU: user 0.06%, sys 1.91%
Benchmark: Sequential write  Limits: Total size: 512MB Duration: 60s
474.4MB processed in 82.08s (5.78MB/s), CPU: user 0.02%, sys 0.87%
Benchmark: Random read  Limits: Total size: 512MB Duration: 60s
302.6MB processed in 60.03s (5.04MB/s), CPU: user 0.05%, sys 2.40%
Benchmark: Random write  Limits: Total size: 512MB Duration: 60s
248.6MB processed in 154.67s (1.61MB/s), CPU: user 0.01%, sys 0.26%
pi@raspberrypi ~/flash-bench $ sudo ./flash-bench
Using test file flash-bench.tmp (using all 512MB).
Benchmark: Sequential read  Limits: Total size: 512MB Duration: 60s
512.0MB processed in 28.62s (17.89MB/s), CPU: user 0.10%, sys 1.97%
Benchmark: Sequential write  Limits: Total size: 512MB Duration: 60s
446.9MB processed in 76.81s (5.82MB/s), CPU: user 0.02%, sys 0.86%
Benchmark: Random read  Limits: Total size: 512MB Duration: 60s
305.8MB processed in 60.05s (5.09MB/s), CPU: user 0.06%, sys 2.93%
Benchmark: Random write  Limits: Total size: 512MB Duration: 60s
242.4MB processed in 141.04s (1.72MB/s), CPU: user 0.01%, sys 0.40%
pi@raspberrypi ~/flash-bench $ sudo ./flash-bench
Using test file flash-bench.tmp (using all 512MB).
Benchmark: Sequential read  Limits: Total size: 512MB Duration: 60s
512.0MB processed in 28.61s (17.89MB/s), CPU: user 0.09%, sys 1.98%
Benchmark: Sequential write  Limits: Total size: 512MB Duration: 60s
467.0MB processed in 80.69s (5.79MB/s), CPU: user 0.03%, sys 0.92%
Benchmark: Random read  Limits: Total size: 512MB Duration: 60s
312.6MB processed in 60.04s (5.21MB/s), CPU: user 0.03%, sys 2.42%
Benchmark: Random write  Limits: Total size: 512MB Duration: 60s
256.9MB processed in 145.10s (1.77MB/s), CPU: user 0.02%, sys 0.28%