Error on Inputs page in 10.1.2

I will say it again for emphasis, there is little information on the ‘device’ facility. For example, this is the diskstats input we created a while back (not actuallt running ATM)
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  • What would be the correct ‘device’ to select and why?
  • The box listed as location is what comes out as description
  • What is a device key and what does it do?