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test code 

puts("Drive List:")
pp Facter::Util::DiskDrives.get_drive_list

puts("Drive Sizes:")
pp Facter::Util::DiskDrives.get_drive_sizes

puts("Drive Types:")
pp Facter::Util::DiskDrives.get_drive_types

puts("Drive Models:")
pp Facter::Util::DiskDrives.get_drive_models

output 

Drive List:
["xvda"]
Drive Sizes:
[{"xvda"=>"10485760"}]
Drive Types:
[{"xvda"=>"xvd"}]
Drive Models:
[{"xvda"=>"Xen Virtual Disk"}]