参考链接： https://bbs.aliyun.com/read/112745.html
[2016-08-03 08:31.26] /drives/c/data
[Administrator.USER-20160229KD] ➤ time dd if=20160715.data of=/dev/null bs=8k
146157+1 records in
146157+1 records out
1197324960 bytes (1.1GB) copied, 6.645216 seconds, 171.8MB/s
real 0m 6.69s
user 0m 0.20s
sys 0m 0.96s
[2016-08-03 08:31.48] /drives/c/data
[Administrator.USER-20160229KD] ➤ time dd if=20160718.data of=/dev/null bs=8k
149590+1 records in
149590+1 records out
1225446360 bytes (1.1GB) copied, 6.684015 seconds, 174.8MB/s
real 0m 6.71s
user 0m 0.14s
sys 0m 1.77s
[2016-08-03 08:32.03] /drives/c/data
[Administrator.USER-20160229KD] ➤ time dd if=20160719.data of=/dev/null bs=8k
150542+1 records in
150542+1 records out
1233244872 bytes (1.1GB) copied, 6.798823 seconds, 173.0MB/s
real 0m 6.81s
user 0m 0.15s
sys 0m 1.23s
![MYA]Y__9DUON@@5_H4F5TEG.png](http://upload-images.jianshu.io/upload_images/1617677-2aeed45ca38ca2d6.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240)
