外接磁盘绝对不能使用NTFS格式分区！速度非常慢

安装测试磁盘速度的软件：

sudo apt-get install hdparm

测试本地card的读写速度：

hdparm -Tt /dev/mmcblk0

pi@raspberrypi ~/downloads $ sudo hdparm -Tt /dev/mmcblk0

/dev/mmcblk0:
 Timing cached reads: 210 MB in 2.02 seconds = 104.21 MB/sec
 Timing buffered disk reads: 54 MB in 3.09 seconds = 17.45 MB/sec
pi@raspberrypi ~/downloads $ dd count=50 bs=1M if=/dev/zero of=~/test.img
50+0 records in
50+0 records out
52428800 bytes (52 MB) copied, 1.55218 s, 33.8 MB/s

测试外接硬盘的读写速度：

hdparm -Tt /dev/sda1

pi@raspberrypi ~/downloads $ sudo hdparm -Tt /dev/sda1

/dev/sda1:
 Timing cached reads: 316 MB in 2.01 seconds = 157.46 MB/sec
 Timing buffered disk reads: 62 MB in 3.03 seconds = 20.48 MB/sec

pi@raspberrypi ~/downloads $ dd count=50 bs=1M if=/dev/zero of=/media/usbdisk/test.img

50+0 records in
50+0 records out
52428800 bytes (52 MB) copied, 13.5962 s, 3.9 MB/s

将external disk 格式化成ext4

sudo mount -t ext4 /dev/sda1 /media/usbdisk

pi@raspberrypi / $ sudo dd count=50 bs=1M if=/dev/zero of=/media/usbdisk/test.img

50+0 records in
50+0 records out
52428800 bytes (52 MB) copied, 1.15549 s, 45.4 MB/s

bingo!!

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