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sg_readcap




SYNOPSIS

       sg_readcap [-lba=<block>] [-pmi] [-V] <device>


DESCRIPTION

       The normal usage is to find  the  number  of  blocks  (and
       block size) of the given device and output them.

       -lba=<block>
              used  in conjunction with "-pmi" option. This vari­
              ant of READ CAPACITY  will  yield  the  last  block
              address  after  "<block>"  prior  to a delay. For a
              disk, given a "<block>" address it yields the high­
              est  numbered  block  on  the  same  cylinder (i.e.
              before the heads need to move). "<block>" is in hex
              (from 0 to ffffffff) and defaults to zero.

       -pmi   partial  medium  indicator:  for  finding  the next
              block address prior to some delay (e.g. head  move­
              ment).  In  the  absence  of this switch, the total
              number of blocks and the block size of  the  device
              are output.

       -V     outputs version string then exits.

       In  the  2.4 series of Linux kernels the given device must
       be a SCSI generic (sg) device. In  the  2.5  series  block
       devices  (e.g. disks and SCSI DVDs) can also be specified.
       For example "sg_readcap /dev/sda" will  work  in  the  2.5
       series kernels.


AUTHORS

       Written by Douglas Gilbert


COPYRIGHT

       Copyright © 1999-2003 Douglas Gilbert
       This  software  is  distributed  under  the GPL version 2.
       There is NO warranty; not even for MERCHANTABILITY or FIT­
       NESS FOR A PARTICULAR PURPOSE.

sg3_utils-1.03              April 2003              SG_READCAP(8)
  
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