[cs615asa] How to read data from device

[Zhengkai Wei]

I dont know how to read original data but 
using cat /dev/sdf can see something.

> 在 2018年5月16日，下午6:22，Zhitao Chen <zchen69 at stevens.edu> 写道：
> 
> Hi,
> 
> Is anyone know to read data from device? I use dd(1) to try to read the data, e.g.
> 
> # dd if=/dev/xbd3a | od -l 
> 
> but it just print 0's
> 
> Then I tried to create a new volume and wrote some data to it, but it also print 0's
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