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# seq read
sudo nice --20 dd if=/dev/sdb of=/dev/null bs=1M count=1k iflag=direct
# random read
sudo nice --20 fio --name=global --rw=randread --bs=4k --direct=1 --numjobs=8 --iodepth=4 --ioengine=mmap --filename=/dev/sdb --name=job1 --runtime=10s
# or ioengine=sg but doesn't work on some mmc