[sleuthkit-users] Problem in creating disk image

[<por...@ho...>]

Hi,I want creat a disk image, and this disk is USB disk. I input dd 
command"dd if='/cygdrive/k' of=kdrive0.img", but it shows like this:        
   dd:reading '/cygdrive/k': Is a directory
0+0 records in
0+0 records out
0 bytes <0 B> copied, 0.001 s, 0 B/s
I want to know how to solve this problem.
Thank you!

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