Provided by: sg3-utils_1.17-2_i386 bug


       sg_start - starts (spins-up) or stops (spins down) SCSI device, load or
       eject medium


       sg_start [-eject] [-imm=0|1] [-load] [-loej] [-pc=<n>] [-start] [-stop]
       [-v] [-V] [0|1] <scsi_device>


       sg_start  sends a START STOP UNIT SCSI command to the given device with
       the selected options. The most used options are ’-stop’ to spin down  a
       disk  and  ’-start’ to spin up a disk. Using ’sg_start -start /dev/sda’
       on a disk that is already spinning is harmless.  There  is  also  finer
       grain  control  with  "power  conditions": active, idle and standby. In
       some contexts the "stop" state can be considered  an  additional  power

       Devices  that  contain  removable  media  such  as  cd/dvds can use the
       ’-loej’ flag to load the medium when used in conjunction with  ’-start’
       (i.e.  load  medium then spin up). Alternatively ’-loej’ may be used to
       eject the medium when used alone  or  when  used  in  conjunction  with
       ’-stop’ (i.e. spin down then eject medium). More simply the loading and
       ejecting of a removable medium can be requested with  the  ’-load’  and
       ’-eject’ options.

       If  no option or argument is given that implies some action, a ’-start’
       is assumed.

       0      stop (spin-down) given device.  Active when ’-pc=" is not  given
              or ’-pc=0’.

       1      start  (spin-up)  given device.  Active when ’-pc=" is not given
              or ’-pc=0’. Harmless if device has already started (or is in the
              process of starting).

       -eject stop  the  medium  and eject it from the drive. Only appropriate
              for a removable medium.

              when  the  immediate  bit  is  1  then  this   utility   returns
              immediately after the device has received the command. When this
              option is 0 (the default) then  the  utility  returns  once  the
              command has completed its action (i.e. it waits until the device
              is started or stopped).

       -load  load the medium in the drive and start it. Only appropriate  for
              a removable medium.

       -loej  load  the  media  when  the unit is started or eject it when the
              unit is stopped. This option is ignored if ’pc > 0’. Default  is
              off   (i.e.  don’t  attempt  to  load  or  eject  media).  If  a
              start/start  indication  is  not  given  (neither  "-start"  nor
              "-stop")  and  this option is given then a stop and eject action
              is assumed.

              set the ’power conditions’ value (in hex); 0  to  f  (inclusive)
              are  valid.   Default  value  is 0.  When ’-pc=0’ then ’-start’,
              ’-stop’ and ’-loej’ are active.  Some common values  are  1  for
              the   active  power  condition  (SBC);  2  for  the  idle  power
              condition; 3 for the standby power condition; 5 for sleep  power
              condition  (MMC);  7  for LU_CONTROL (SBC), 0xa (decimal 10) for
              FORCE_IDLE_0 (SBC) and  0xb  (decimal  11)  for  FORCE_STANDBY_0
              (SBC).   See  recent  SBC-2, MMC-4 and SAS drafts at
              for more information.

       -start start (spin-up) given device. Using this option  on  an  already
              started device is harmless. Same meaning as "1" argument.

       -stop  stop (spin-down) given device. Same meaning as "0" argument.

       -v     verbose:  outputs  SCSI  command  in  hex to console before with
              executing it.  ’-vv’  and  ’-vvv’  are  also  accepted  yielding
              greater verbosity.

       -V     print out version string then exit.

       To  avoid  confusion, only one of "0", "1", "-start" and "-stop" can be

       If this utility succeeds then its process exits with  a  status  of  0;
       otherwise it exits with a non-zero status.

       There  is  an  associated  "power  condition" mode page (0x1a) in which
       timer values can be set for transitioning to  either  idle  or  standby
       state  after  a period of inactivity. The sdparm utility can be used to
       view the power condition mode page and the sginfo utility can view  and
       change  it.   If  a device is in either idle or standby power condition
       state then a REQUEST SENSE command (see the sg_requests utility) should
       yield  a  sense  key of "no sense" and an additional sense code of "Low
       power condition on".

       Ejection of removable media (e.g. ’sg_start -eject /dev/hdd’ where  the
       device  is  an  ATAPI cd/dvd drive) may be prevented by a prior PREVENT
       ALLOW MEDIUM REMOVAL SCSI command (see sg_prevent). In this  case  this
       utility  should  fail  with  an  error generated by the device: illegal
       request / medium removal prevented.

       In the 2.4 series of Linux kernels the given  device  must  be  a  SCSI
       generic  (sg)  device.  In the 2.6 series block devices (e.g. disks and
       SCSI DVDs) can also be specified. For  example  "sg_start  0  /dev/sda"
       will work in the 2.6 series kernels.


       Earlier  versions  had  a  ’-s’  option  to perform a SYNCHRONIZE CACHE
       command before the START STOP UNIT command  was  issued.  According  to
       recent SBC-2 drafts this is done implicitly if required. Hence the "-s"
       option has been dropped.


       Written by K. Garloff and D. Gilbert


       Report bugs to <dgilbert at interlog dot com>.


       Copyright © 2002-2005 Kurt Garloff, Douglas Gilbert
       This software is distributed under the  GPL  version  2.  There  is  NO
       warranty;  not  even  for  MERCHANTABILITY  or FITNESS FOR A PARTICULAR


       sg_prevent(sg3_utils),     sg_requests(sg3_utils),      sdparm(sdparm),