Volume Control Block
		  1				      0
		|=======================================|
0		| Transaction Count                     |  V.TRCT
		|---------------------------------------|
2		| Address of Index File Window Block    |  V.IFWI
		|---------------------------------------|
4		| File Control Block                    |  V.FCB
		|--                                   --|
 		|   List Head                           |
		|-------------------|-------------------|
10	V.IBSZ	| Index Bitmap Size | Index High LBN    |  V.IBLB
		|-------------------|                 --|
  		|   Index File Bitmap Low LBN           |
		|---------------------------------------|
14		| Maximum Files allowed on Volume       |  V.FMAX
		|-------------------|-------------------|
16	V.SBCL	| Cluster Factor    | Default Window Sz.|  V.WISZ
		|-------------------|-------------------|
20		| Storage Bitmap Size in Blocks         |  V.SBSZ
		|-------------------|-------------------|
22	V.FIEX	| Default Extend    | Bitmap High LBN   |  V.SBLB
		|-------------------|                 --|
  		|   Storage Bitmap Low LBN              |
		|---------------------------------------|
26		| Volume Owner UIC                      |  V.VOWN
		|---------------------------------------|
30		| Volume Protection                     |  V.VPRO
		|---------------------------------------|
32		| Volume Characteristics                |  V.VCHA
		|---------------------------------------|
34		| Volume Default File Protection        |  V.FPRO
		|---------------------------------------|
36		| Volume File Sequence Number           |  V.VFSQ
		|-------------------|-------------------|
40	V.LRUC	| Free LRU Slots    | Free Blocks-High  |  V.FRBK
		|-------------------|                 --|
  		|   Free Blocks on Volume - Low Part    |
		|---------------------------------------|
44		| Volume Label in ASCII ( 12 Bytes )    |  V.LABL
		|--                                   --|
		|                                       |
		|--                                   --|
		|                                       |
		|-------------------|-------------------|
52	V.FFNU	| First Bitmap Blk. | Volume Status     |  V.STAT
		|=======================================|
			Length = V.LGTH





			File Control Block
		  1				      0
		|=======================================|
0		| FCB Chain Link                        |  F.LINK
		|---------------------------------------|
2		| File Number                           |  F.FNUM
		|---------------------------------------|
4		| File Sequence Number                  |  F.FSEQ
		|-------------------|-------------------|
6	F.FSQN	| File Segment No.  | Unused            |
		|-------------------|-------------------|
10		| File Owner UIC                        |  F.FOWN
		|---------------------------------------|
12		| File Protection Code                  |  F.FPRO
		|-------------------|-------------------|
14	F.SCHA	| System Character. | User Character.   |  F.UCHA
		|-------------------|-------------------|
16		| File Header Logical Block Number      |  F.HDLB
		|--                                   --|
		|   ( Beginning of Statistics Block )   |
		|---------------------------------------|
22		| LBN of Virtual Block 1                |  F.LBN
		|--                                   --|
		|    if Contiguous else 0               |
		|---------------------------------------|
26		| File Size in Blocks                   |  F.SIZE
		|--                                   --|
		|                                       |
		|-------------------|-------------------|
32	F.NLCK	| Number Locks      | Number Accessors  |  F.NACS
		|-------------------|-------------------|
34	       	| FCB status        | Number Writers    |  F.NWAC
		|-------------------|-------------------|
36		| Directory EOF Block Number            |  F.DREF
		|---------------------------------------|
40		| First Word of Directory Name          |  F.DRNM
		|---------------------------------------|
42		| Pointer to Extension FCB              |  F.FEXT
		|---------------------------------------|
44		| Starting VBN of this File Segment     |  F.FVBN
		|--                                   --|
		|                                       |
		|---------------------------------------|
50		| Pointer to Locked Block List          |  F.LKL
		|=======================================|
			Length = F.LGTH




				Window Block
		  1				      0
		|=======================================|
0		| Status               No Active Maps   |  W.CTL
		|-------------------|-------------------|
2	W.WISZ	| No pointers in Win| High VBN Mapped   |  W.VBN
		|-------------------|                 --|
 		|  Low part of 1st VBN Mapped by Window |
		|---------------------------------------|
6		| File Control Block (FCB) Address      |  W.FCB
		|---------------------------------------|
10		| Pointer to Locked Block List          |  W.LKL
		|---------------------------------------|
12		|     Beginning of Retrieval Pointers   |  W.RTRV
		|                                       |  (W.MAP)
		/                                       \
		\                                       /
		|					|
		|=======================================|




			Locked Block List
		  1				      0
		|=======================================|
0		| Link to next Node in List             |  L.LNK
		|---------------------------------------|
2		| Pointer to Window for First Entry     |  L.WI1
		|-------------------|-------------------|
4	L.CNT	| Count             | High VBN          |  L.VB1
		|-------------------|                 --|
		| Low Order VBN for Lock                |
		|=======================================|
			Length = L.LGTH