scsi_readcap - do SCSI READ CAPACITY command on disks
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.
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
- -v, --verbose
- increase level or verbosity.
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
Written by D. Gilbert
Copyright © 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.