06-12-2014
Well I dont have much linux knowldge, but since you are talking disks, the same philosophy should apply:
First two give you a value of 128 (kb)
The last, blockdev since to talk like ioctl etc... and so is in blocks ( of 512 bytes) 256 block of 512 bytes...
To me then the values are much the same
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LEARN ABOUT FREEBSD
getbsize
GETBSIZE(3) BSD Library Functions Manual GETBSIZE(3)
NAME
getbsize -- get preferred block size
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <stdlib.h>
char *
getbsize(int *headerlenp, long *blocksizep);
DESCRIPTION
The getbsize() function returns a preferred block size for reporting by system utilities df(1), du(1), ls(1) and systat(1), based on the
value of the BLOCKSIZE environment variable. BLOCKSIZE may be specified directly in bytes, or in multiples of a kilobyte by specifying a
number followed by ``K'' or ``k'', in multiples of a megabyte by specifying a number followed by ``M'' or ``m'' or in multiples of a gigabyte
by specifying a number followed by ``G'' or ``g''. Multiples must be integers.
Valid values of BLOCKSIZE are 512 bytes to 1 gigabyte. Sizes less than 512 bytes are rounded up to 512 bytes, and sizes greater than 1 GB
are rounded down to 1 GB. In each case getbsize() produces a warning message.
The getbsize() function returns a pointer to a null-terminated string describing the block size, something like ``1K-blocks''. The memory
referenced by headerlenp is filled in with the length of the string (not including the terminating null). The memory referenced by
blocksizep is filled in with block size, in bytes.
SEE ALSO
df(1), du(1), ls(1), systat(1), environ(7)
HISTORY
The getbsize() function first appeared in 4.4BSD.
BSD
November 16, 2012 BSD