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pexcn/sdcard_write_test.md

Created September 2, 2019 09:29
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sdcard_write_test.md

SDCard Write Speed Test

# 64k
dd if=/dev/zero of=test bs=64k count=1638 && rm -f test
dd if=/dev/zero of=test bs=64k count=1638 conv=fdatasync && rm -f test
dd if=/dev/zero of=test bs=64k count=1638 conv=fsync && rm -f test
dd if=/dev/zero of=test bs=64k count=1638 oflag=dsync && rm -f test
# 1024k
dd if=/dev/zero of=test bs=1024k count=100 && rm -f test
dd if=/dev/zero of=test bs=1024k count=100 conv=fdatasync && rm -f test
dd if=/dev/zero of=test bs=1024k count=100 conv=fsync && rm -f test
dd if=/dev/zero of=test bs=1024k count=100 oflag=dsync && rm -f test
  • 4 GB, Class 4: 7.0 MB/s ~ 7.2 MB/s
  • 16 GB, Class 6: 7.2 MB/s ~ 8.2 MB/s
  • 16 GB, Class 10: 16.1 MB/s ~ 17.3 MB/s
  • 32 GB, Class 10: 8.3 MB/s ~ 9.7 MB/s
  • 16 GB, U 盘: 16.4 MB/s ~ 19.8 MB/s
  • 32 GB, 山寨 U 盘: 3.6 MB/s ~ 4.3 MB/s
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