Is this a DD bug?

[daniel_nysveen]

Hi, 



I have a strange dd problem when running the dd command on brand new hard 
drives.  I am often creating clones of hard drives and I have come across 
something I don't understand. If I DD to a hard drive that has been previously 
used, the DD takes about 35 minutes. If I clone to a completely brand new 
drive, the DD takes over 100 minutes. If I immediately run the DD command 
again, on the same set of drives, the DD now only takes 35 minutes. Do you have 
any ideas on what is going on? 



Thank you, 


Daniel Nysveen