lreset

The lreset program tells the underlying SCSI library to reset the named logical SCSI bus. You must have administrative privileges to execute this command, which has the following format:

lreset busnumber 

The lreset command can cause the destruction of vital data, because the command causes a SCSI bus reset. The command may also crash your system. You should only use the lreset command as an extreme last resort to quit a process that is not responding.