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here is my dd test:

10240+0 records in
10240+0 records out
83886080 bytes (84 MB) copied, 0.136335 s, 615 MB/s

previously I used a HDD, now using the SSD. In the Python idle or Geany, I found that I must to close the applicaton to let data write through disk.

cat /etc/fstab

# <file system> <mount point>   <type>  <options>       <dump>  <pass>
proc            /proc           proc    nodev,noexec,nosuid 0       0
# / was on /dev/sda1 during installation
UUID=7df3ec50-b5d6-4d40-afec-d996671a5b26 /               ext4        discard,noatime,nodiratime,errors=remount-ro 0       1
# swap was on /dev/sda5 during installation
UUID=64fe8598-9ccd-4e95-b279-0bc78c4d6999 none            swap    sw              0       0
tmpfs /tmp tmpfs defaults,noatime,mode=1777 0 0
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