# phpman > man > sg_read_block_limits(8)

[SG_READ_BLOCK_LIMITS(8)](https://www.chedong.com/phpMan.php/man/SGREADBLOCKLIMITS/8/markdown)                       SG3_UTILS                      [SG_READ_BLOCK_LIMITS(8)](https://www.chedong.com/phpMan.php/man/SGREADBLOCKLIMITS/8/markdown)



## NAME
       sg_read_block_limits - send SCSI READ BLOCK LIMITS command

## SYNOPSIS
       **sg**___**read**___**block**___**limits** [_--help_] [_--hex_] [_--raw_]  [_--readonly_] [_--verbose_] [_--version_] _DEVICE_

## DESCRIPTION
       Send a SCSI READ BLOCK LIMITS command to _DEVICE_ and outputs the response. This command is de‐
       fined  for  tape  (drives)  and  its  description  is  found  in   the   SSC   documents   at
       <http://www.t10.org> .

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

### -h --help
              output the usage message then exit.

### -H --hex
              output response in hex (rather than decode it).

### -r --raw
              output response in binary to stdout.

### -R --readonly
              open _DEVICE_ in read-only mode. The default is to open it in read-write mode.

### -v --verbose
              increase the level of verbosity, (i.e. debug output).

### -V --version
              print the version string and then exit.

## EXIT STATUS
       The  exit  status  of  sg_read_block_limits  is  0  when  it is successful. Otherwise see the
       [sg3_utils(8)](https://www.chedong.com/phpMan.php/man/sg3utils/8/markdown) man page.

## EXAMPLES
       It is usually okay to use no options. Here is an invocation (on the first line following  the
       "#" command prompt) followed by some typical output:

          # sg_read_block_limits /dev/st0
       Read Block Limits results:
               Minimum block size: 1 byte(s)
               Maximum block size: 16777215 byte(s), 16383 KB, 15 MB

## AUTHORS
       Written by Douglas Gilbert.

## REPORTING BUGS
       Report bugs to <dgilbert at interlog dot com>.

## COPYRIGHT
       Copyright © 2009-2017 Douglas Gilbert
       This software is distributed under a FreeBSD license. There is NO warranty; not even for MER‐
       CHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

## SEE ALSO
       **sg3**___**utils(sg3**___**utils)**



sg3_utils-1.43                              October 2017                     [SG_READ_BLOCK_LIMITS(8)](https://www.chedong.com/phpMan.php/man/SGREADBLOCKLIMITS/8/markdown)