jirka@Jirka-TV:~$ hdparm -y /dev/sdb1
/dev/sdb1: Permission denied
jirka@Jirka-TV:~$ sudo hdparm -y /dev/sdb1
[sudo] heslo pro jirka:    

/dev/sdb1:
 issuing standby command
SG_IO: bad/missing sense data, sb[]:  70 00 01 00 00 00 00 0a 00 00 00 00 00 1d 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
jirka@Jirka-TV:~$