Strange text from kernel then detaching USB drive: "sldoosstf sd/e v irceemo"

[Александр Деревянко]

Hello all !

I got a very confusing messages from kernel then detaching one of my USB 
external HD (used only for backups):


May 29 12:40:08 perforce kernel: GEOM_LABEL: Label ufs/Backup5 removed.
May 29 12:40:08 perforce kernel: GEOM_LABEL: Label for provider da0s1 is 
ufs/Backup5.
May 29 12:40:08 perforce kernel: GEOM_LABEL: Label for provider da0s1 is 
msdosfs/ .
May 29 12:40:32 perforce kernel: umass0: at uhub3 port 1 (addr 2) 
disconnected
May 29 12:40:32 perforce kernel: (da0:uGmEaOsMs_-LsAiBmE0L::0 :La0b:e0l) 
:m sldoosstf sd/e v irceemo
May 29 12:40:32 perforce kernel: v(edda.0:
May 29 12:40:32 perforce kernel: umGaEsOsM-_sLiAmBE0L::0 :L0a:b0e)l:  
ruefmso/vBiancgk udpe5v irceem oevnetdr.y
May 29 12:40:32 perforce kernel:
May 29 12:40:32 perforce kernel: umass0: detached


I don't understand messages between  "umass0: at uhub3 port 1 (addr 2) 
disconnected" and "umass0: detached".
What does it mean?

Best Regards,
Alexander Derevyanko.