Table 189

+=============-========================-=============+ 
|    Code     |  Description           |  Support    | 
|-------------+------------------------+-------------| 
|    000b     |  Blocks                |  Mandatory  | 
|    001b     |  Filemarks             |  Mandatory  | 
|    010b     |  Sequential filemarks  |  Optional   | 
|    011b     |  End-of-data           |  Optional   | 
|    100b     |  Setmarks              |  Optional   | 
|    101b     |  Sequential setmarks   |  Optional   | 
| 110b - 111b |  Reserved              |             | 
+====================================================+