这些1,2,3有什么区别啊？？

[weixin_38056905]

Jan 19 21:15:22 ultra10 unix: WARNING: /pci@1f,0/pci@1,1/ide@3/dad@0,0 (dad0):
Jan 19 21:15:22 ultra10         ATA transport failed: reason 'reset': retrying command
Jan 19 21:15:22 ultra10
Jan 19 21:15:22 ultra10 unix: WARNING: /pci@1f,0/pci@1,1/ide@3/dad@1,0 (dad2):
Jan 19 21:15:22 ultra10         ATA transport failed: reason 'timeout': retrying command

dad@0,0
dad@1,0
dad0
dad2

有什么明显的不同吗？