I-Tech YMBAO100, User Manual

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D. USB (flash disk) Test
Insert the USB flash disk then assure it is in
YMBAO100
device list.
Note: This operation may damage the data stored in the USB flash disk.
Before starting the test, make sure there is no critical data in the
eMMC flash being used.
•
Read, write, and check
USB_DIR="/run/media/mmcblk1p1"
#create data file
dd if=/dev/urandom of=/var/data1 bs=1024k count=100
#write data to usb flash disk
dd if=/var/data1 of=$USB_DIR/data2 bs=1024k count=100
#read data2, and compare with data1
cmp $USB_DIR/data2 /var/data1
•
USB speed test
USB_DIR="/run/media/mmcblk1p1"
# usb write speed
dd if=/dev/zero of=$BASIC_DIR/$i/test bs=1M count=1000 oflag=nocache
# usb read speed
dd if=$BASIC_DIR/$i/test of=/dev/null bs=1M oflag=nocache