btod(D3X)

NAME
     btod - convert from bytes to disk sectors

SYNOPSIS
     #include "sys/types.h"
     #include "sys/param.h"
     #include "sys/immu.h"

     btod(int num_bytes);

DESCRIPTION
     btod is a macro that converts from a byte count to a disk sector count,
     where a disk sector is defined as 512 bytes. The btod macro rounds the
     byte count up to a full sector size before conversion.