scsi_readcap - do SCSI READ CAPACITY command on disks
scsi_readcap [--brief] [--help] [--long] [--verbose] DEVICE [DEVICE]*
This bourne 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.
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.
print out the usage message then exit.
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.
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 page.
Written by D. Gilbert
Copyright © 2009 Douglas Gilbert
This software is distributed under a FreeBSD license. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR