MYDBA@ORCL > create tablespace test datafile 'e:\oracle\product\10.1.0\oradata\orcl\test.dbf'
  2  size 10m;

Tablespace created.

MYDBA@ORCL > select sum(bytes)/1024/1024 from dba_free_space
  2  where tablespace_name = 'TEST';

SUM(BYTES)/1024/1024
--------------------
              9.9375

1 row selected.

MYDBA@ORCL > select sum(bytes) from dba_segments where tablespace_name = 'TEST';

SUM(BYTES)
----------


1 row selected.

MYDBA@ORCL > select bytes from dba_segments where tablespace_name = 'TEST';

no rows selected

MYDBA@ORCL > select bytes from dba_extents where tablespace_name = 'TEST'
  2  ;

no rows selected

MYDBA@ORCL > select (10-9.9375)*1024*1024 from dual;

(10-9.9375)*1024*1024
---------------------
                65536

1 row selected.

dbadmin@xxx > create tablespace test datafile '/dev/vx/rdsk/dev/scid_junk' size 33m;
create tablespace test datafile '/dev/vx/rdsk/dev/scid_junk' size 33m
*
ERROR at line 1:
ORA-01119: error in creating database file '/dev/vx/rdsk/dev/scid_junk'
ORA-27042: not enough space on raw partition to fullfill request
Additional information: 1


dbadmin@xxx > create tablespace test datafile '/dev/vx/rdsk/dev/scid_junk' size 32m;

Tablespace created.