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《雷龙发展提供的CS创世SD NAND》1、写的速度:
- 100+0 records in~# time dd if=/mnt/1.txt of=/dev/null bs=1M count=100 iflag=direc
- 100+0 records out
- 104857600 bytes (105 MB, 100 MiB) copied, 4.17846 s, 25.1 MB/s
- real 0m4.259s
- user 0m0.001s
- sys 0m0.658s
- ynct@myir-yg2lx:~# time dd if=tempfile of=/mnt/1.txt bs=1M count=100 conv=fdatas
- 100+0 records in
- 100+0 records out
- 104857600 bytes (105 MB, 100 MiB) copied, 4.24326 s, 24.7 MB/s
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速度为24.7MB/s
2、读的速度: - root@myir-yg2lx:/# time dd if=/mnt/1.txt of=/dev/null bs=1M count=100 iflag=direct,nonblock
- 100+0 records in
- 100+0 records out
- 104857600 bytes (105 MB, 100 MiB) copied, 1.88799 s, 55.5 MB/s
- real 0m1.893s
- user 0m0.005s
- sys 0m0.062s
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读的速度达到了55.5MB/s
ScanDisk 16G插入SD卡后自动识别: - [ 4205.897770] mmc1: new high speed SDHC card at address ef6d
- [ 4205.909758] mmcblk1: mmc1:ef6d AFGCC 14.8 GiB
- [ 4205.927461] mmcblk1: p1 p2 p3
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写的速度为24.7MB/s: - 100+0 records out# time dd if=/mnt/1.txt of=/dev/null bs=1M count=100 iflag=direc
- 104857600 bytes (105 MB, 100 MiB) copied, 4.25149 s, 24.7 MB/s
- real 0m4.332s
- user 0m0.001s
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读的速度为40MB/s
- 100+0 records in~# time dd if=tempfile of=/mnt/1.txt bs=1M count=100 conv=fdatasy
- 100+0 records out
- 104857600 bytes (105 MB, 100 MiB) copied, 2.62025 s, 40.0 MB/s
- real 0m2.625s
- user 0m0.001s
- sys 0m0.125s
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Gemaixi512G插入后自动识别 - root@myir-yg2lx:~# [ 4363.624406] mmc1: card ef6d removed
- [ 4380.805766] mmc1: new high speed SDXC card at address 2143
- [ 4380.812127] mmcblk1: mmc1:2143 APPSD 500 GiB
- [ 4380.825030] Alternate GPT is invalid, using primary GPT.
- [ 4380.830420] mmcblk1: p1 p2 p3
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写入速度24.7MB/s: - [ 4380.8304g2lx:~# time dd if=tempfile of=/mnt/1.txt bs=1M count=100 conv=fdatasync
- 100+0 records in1.txt of=/dev/null bs=1M count=100 iflag=direc
- 100+0 records out
- 104857600 bytes (105 MB, 100 MiB) copied, 4.24071 s, 24.7 MB/s
- real 0m4.323s
- user 0m0.001s
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读取39MB/s: - syst@myir-yg2lx:~# time dd if=/mnt/1.txt of=/dev/null bs=1M count=100 iflag=direct,nonblock
- 100+0 records in~# time dd if=tempfile of=/mnt/1.txt bs=1M count=100 conv=fdatasy
- 100+0 records out
- 104857600 bytes (105 MB, 100 MiB) copied, 2.66665 s, 39.3 MB/s
- real 0m2.671s
- user 0m0.001s
- sys 0m0.130s
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终上所述TF卡的写入速度均为24.7MB/s,但是读取的速度还是以SD NAND速度为最快,达到了55.5MB/S。
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