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
       CAPACITY(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
              CAPACITY(16) command is sent. The latter command yields more
              information 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 (C) 2009-2013 Douglas Gilbert
       This software is distributed under a FreeBSD license. There is NO
       warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR
       PURPOSE.

SEE ALSO
       sg_readcap (sg3_utils)

sg3_utils-1.36                     May 2013                    SCSI_READCAP(8)