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SCSI_READCAP(8)			   SG3_UTILS		       SCSI_READCAP(8)

NAME
       scsi_readcap - do SCSI READ CAPACITY command on disks

SYNOPSIS
       scsi_readcap [--brief] [--help] [--long] [--verbose] DEVICE [DEVICE]*

DESCRIPTION
       This  bash  shell  script  calls	 the  sg_readcap utility on each given
       DEVICE. This will send a SCSI READ CAPACITY command to each DEVICE.

       The default action of this script is to	send  the  10  byte  cdb  READ
       CAPACITY(10) command to each DEVICE. If a response indicates the number
       of blocks is greater than or equal to '2**32 - 1' then the READ	CAPAC‐
       ITY(16) is sent and its response is output.

OPTIONS
       Arguments to long options are mandatory for short options as well.

       -b, --brief
	      shortens the output to two hexadecimal numbers, both prefixed by
	      '0x'.  The first number is the number of	blocks	available  and
	      the second is the size of each blocks in bytes (e.g. '0x12a19eb0
	      0x200'). If an error is detected '0x0 0x0'  is  output  and  the
	      script continues if there are more DEVICEs.

       -h, --help
	      print out the usage message then exit.

       -l, --long
	      the  default  is to send the READ CAPACITY(10) command (i.e. the
	      10 byte cdb variant). When this option is given the READ	CAPAC‐
	      ITY(16) command is sent. The latter command yields more informa‐
	      tion in its response.

       -v, --verbose
	      increase level or verbosity.

EXIT STATUS
       The exit status of this script is 0 when it  is	successful.  Otherwise
       the  exit status is that of the last sg_readcap utility called. See the
       sg3_utils(8) man page.

AUTHORS
       Written by D. Gilbert

COPYRIGHT
       Copyright © 2009-2013 Douglas Gilbert
       This software is distributed under a FreeBSD license. There is NO  war‐
       ranty;  not  even  for MERCHANTABILITY or FITNESS FOR A PARTICULAR PUR‐
       POSE.

SEE ALSO
       sg_readcap (sg3_utils)

sg3_utils-1.36			   May 2013		       SCSI_READCAP(8)

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