


                        Ŀ
                                          
                            APPENDIX  B   
                                          
                        


           Ŀ
                                                        
                    DISK SPACE USED BY SECTORS          
                                                        
           




The fine structure of sectors (Chapter I - section 7) shows that a
sector requires

            62  +  128 * 2^N  +  size of format gap

disk bytes.

Some disk utilities display the measure (expressed in degrees) of the
arc used by a sector (about  36/625 * number of disk bytes).

The following table gives the measure of sector arcs for N in  [0..4]
and format gap in  [6..255].

The table is useful to try guessing the size of the format gap when
N and sector arc are known.


     Gap       N=0        N=1        N=2        N=3       N=4
     ---------------------------------------------------------
     06h      11.3       18.7       33.5       62.9      121.9
     07h      11.4       18.8       33.5       63.0      122.0
     08h      11.5       18.8       33.6       63.1      122.0
     09h      11.5       18.9       33.6       63.1      122.1
     0Ah      11.6       18.9       33.7       63.2      122.2
     0Bh      11.6       19.0       33.7       63.2      122.2
     0Ch      11.7       19.1       33.8       63.3      122.3
     0Dh      11.7       19.1       33.9       63.4      122.3
     0Eh      11.8       19.2       33.9       63.4      122.4
     0Fh      11.9       19.2       34.0       63.5      122.4
     10h      11.9       19.3       34.0       63.5      122.5
     11h      12.0       19.3       34.1       63.6      122.6
     12h      12.0       19.4       34.1       63.6      122.6
     13h      12.1       19.5       34.2       63.7      122.7
     14h      12.1       19.5       34.3       63.8      122.7
     15h      12.2       19.6       34.3       63.8      122.8      
     16h      12.3       19.6       34.4       63.9      122.9      
     17h      12.3       19.7       34.4       63.9      122.9      
     18h      12.4       19.7       34.5       64.0      123.0
     19h      12.4       19.8       34.6       64.0      123.0      
     1Ah      12.5       19.9       34.6       64.1      123.1      
     1Bh      12.5       19.9       34.7       64.2      123.1      
     1Ch      12.6       20.0       34.7       64.2      123.2      
     1Dh      12.7       20.0       34.8       64.3      123.3      
     1Eh      12.7       20.1       34.8       64.3      123.3      
     1Fh      12.8       20.2       34.9       64.4      123.4      
     20h      12.8       20.2       35.0       64.4      123.4      
     21h      12.9       20.3       35.0       64.5      123.5      
     22h      13.0       20.3       35.1       64.6      123.5      
     23h      13.0       20.4       35.1       64.6      123.6      
     24h      13.1       20.4       35.2       64.7      123.7      
     25h      13.1       20.5       35.2       64.7      123.7      
     26h      13.2       20.6       35.3       64.8      123.8      
     27h      13.2       20.6       35.4       64.8      123.8      
     28h      13.3       20.7       35.4       64.9      123.9      
     29h      13.4       20.7       35.5       65.0      123.9      
     2Ah      13.4       20.8       35.5       65.0      124.0      
     2Bh      13.5       20.8       35.6       65.1      124.1      
     2Ch      13.5       20.9       35.6       65.1      124.1      
     2Dh      13.6       21.0       35.7       65.2      124.2
     2Eh      13.6       21.0       35.8       65.3      124.2      
     2Fh      13.7       21.1       35.8       65.3      124.3      
     30h      13.8       21.1       35.9       65.4      124.4      
     31h      13.8       21.2       35.9       65.4      124.4      
     32h      13.9       21.2       36.0       65.5      124.5      
     33h      13.9       21.3       36.0       65.5      124.5      
     34h      14.0       21.4       36.1       65.6      124.6      
     35h      14.0       21.4       36.2       65.7      124.6      
     36h      14.1       21.5       36.2       65.7      124.7      
     37h      14.2       21.5       36.3       65.8      124.8      

     Gap       N=0        N=1        N=2        N=3       N=4
     ---------------------------------------------------------
     38h      14.2       21.6       36.3       65.8      124.8      
     39h      14.3       21.6       36.4       65.9      124.9      
     3Ah      14.3       21.7       36.5       65.9      124.9      
     3Bh      14.4       21.8       36.5       66.0      125.0      
     3Ch      14.4       21.8       36.6       66.1      125.0      
     3Dh      14.5       21.9       36.6       66.1      125.1      
     3Eh      14.6       21.9       36.7       66.2      125.2      
     3Fh      14.6       22.0       36.7       66.2      125.2
     40h      14.7       22.1       36.8       66.3      125.3      
     41h      14.7       22.1       36.9       66.3      125.3      
     42h      14.8       22.2       36.9       66.4      125.4      
     43h      14.9       22.2       37.0       66.5      125.4      
     44h      14.9       22.3       37.0       66.5      125.5      
     45h      15.0       22.3       37.1       66.6      125.6      
     46h      15.0       22.4       37.1       66.6      125.6      
     47h      15.1       22.5       37.2       66.7      125.7      
     48h      15.1       22.5       37.3       66.8      125.7      
     49h      15.2       22.6       37.3       66.8      125.8      
     4Ah      15.3       22.6       37.4       66.9      125.8      
     4Bh      15.3       22.7       37.4       66.9      125.9      
     4Ch      15.4       22.7       37.5       67.0      126.0      
     4Dh      15.4       22.8       37.5       67.0      126.0      
     4Eh      15.5       22.9       37.6       67.1      126.1      
     4Fh      15.5       22.9       37.7       67.2      126.1      
     50h      15.6       23.0       37.7       67.2      126.2      
     51h      15.7       23.0       37.8       67.3      126.3      
     52h      15.7       23.1       37.8       67.3      126.3      
     53h      15.8       23.1       37.9       67.4      126.4      
     54h      15.8       23.2       38.0       67.4      126.4
     55h      15.9       23.3       38.0       67.5      126.5      
     56h      15.9       23.3       38.1       67.6      126.5      
     57h      16.0       23.4       38.1       67.6      126.6      
     58h      16.1       23.4       38.2       67.7      126.7      
     59h      16.1       23.5       38.2       67.7      126.7      
     5Ah      16.2       23.6       38.3       67.8      126.8      
     5Bh      16.2       23.6       38.4       67.8      126.8      
     5Ch      16.3       23.7       38.4       67.9      126.9      
     5Dh      16.4       23.7       38.5       68.0      126.9      
     5Eh      16.4       23.8       38.5       68.0      127.0      
     5Fh      16.5       23.8       38.6       68.1      127.1      
     60h      16.5       23.9       38.6       68.1      127.1      
     61h      16.6       24.0       38.7       68.2      127.2      
     62h      16.6       24.0       38.8       68.2      127.2      
     63h      16.7       24.1       38.8       68.3      127.3      
     64h      16.8       24.1       38.9       68.4      127.3      
     65h      16.8       24.2       38.9       68.4      127.4      
     66h      16.9       24.2       39.0       68.5      127.5      
     67h      16.9       24.3       39.0       68.5      127.5      
     68h      17.0       24.4       39.1       68.6      127.6      
     69h      17.0       24.4       39.2       68.7      127.6

     Gap       N=0        N=1        N=2        N=3       N=4
     ---------------------------------------------------------
     6Ah      17.1       24.5       39.2       68.7      127.7      
     6Bh      17.2       24.5       39.3       68.8      127.7      
     6Ch      17.2       24.6       39.3       68.8      127.8      
     6Dh      17.3       24.6       39.4       68.9      127.9      
     6Eh      17.3       24.7       39.4       68.9      127.9      
     6Fh      17.4       24.8       39.5       69.0      128.0      
     70h      17.4       24.8       39.6       69.1      128.0      
     71h      17.5       24.9       39.6       69.1      128.1      
     72h      17.6       24.9       39.7       69.2      128.2      
     73h      17.6       25.0       39.7       69.2      128.2      
     74h      17.7       25.0       39.8       69.3      128.3      
     75h      17.7       25.1       39.9       69.3      128.3      
     76h      17.8       25.2       39.9       69.4      128.4      
     77h      17.8       25.2       40.0       69.5      128.4      
     78h      17.9       25.3       40.0       69.5      128.5      
     79h      18.0       25.3       40.1       69.6      128.6      
     7Ah      18.0       25.4       40.1       69.6      128.6      
     7Bh      18.1       25.5       40.2       69.7      128.7
     7Ch      18.1       25.5       40.3       69.7      128.7      
     7Dh      18.2       25.6       40.3       69.8      128.8      
     7Eh      18.3       25.6       40.4       69.9      128.8      
     7Fh      18.3       25.7       40.4       69.9      128.9      
     80h      18.4       25.7       40.5       70.0      129.0      
     81h      18.4       25.8       40.5       70.0      129.0      
     82h      18.5       25.9       40.6       70.1      129.1      
     83h      18.5       25.9       40.7       70.1      129.1      
     84h      18.6       26.0       40.7       70.2      129.2      
     85h      18.7       26.0       40.8       70.3      129.2      
     86h      18.7       26.1       40.8       70.3      129.3      
     87h      18.8       26.1       40.9       70.4      129.4      
     88h      18.8       26.2       40.9       70.4      129.4      
     89h      18.9       26.3       41.0       70.5      129.5      
     8Ah      18.9       26.3       41.1       70.6      129.5      
     8Bh      19.0       26.4       41.1       70.6      129.6      
     8Ch      19.1       26.4       41.2       70.7      129.6      
     8Dh      19.1       26.5       41.2       70.7      129.7      
     8Eh      19.2       26.5       41.3       70.8      129.8      
     8Fh      19.2       26.6       41.3       70.8      129.8      
     90h      19.3       26.7       41.4       70.9      129.9
     91h      19.3       26.7       41.5       71.0      129.9      
     92h      19.4       26.8       41.5       71.0      130.0      
     93h      19.5       26.8       41.6       71.1      130.1      
     94h      19.5       26.9       41.6       71.1      130.1      
     95h      19.6       26.9       41.7       71.2      130.2      
     96h      19.6       27.0       41.8       71.2      130.2      
     97h      19.7       27.1       41.8       71.3      130.3      
     98h      19.7       27.1       41.9       71.4      130.3      
     99h      19.8       27.2       41.9       71.4      130.4      
     9Ah      19.9       27.2       42.0       71.5      130.5      
     9Bh      19.9       27.3       42.0       71.5      130.5      

     Gap       N=0        N=1        N=2        N=3       N=4
     ---------------------------------------------------------
     9Ch      20.0       27.4       42.1       71.6      130.6      
     9Dh      20.0       27.4       42.2       71.6      130.6      
     9Eh      20.1       27.5       42.2       71.7      130.7      
     9Fh      20.2       27.5       42.3       71.8      130.7      
     A0h      20.2       27.6       42.3       71.8      130.8      
     A1h      20.3       27.6       42.4       71.9      130.9      
     A2h      20.3       27.7       42.4       71.9      130.9
     A3h      20.4       27.8       42.5       72.0      131.0      
     A4h      20.4       27.8       42.6       72.0      131.0      
     A5h      20.5       27.9       42.6       72.1      131.1      
     A6h      20.6       27.9       42.7       72.2      131.1      
     A7h      20.6       28.0       42.7       72.2      131.2      
     A8h      20.7       28.0       42.8       72.3      131.3      
     A9h      20.7       28.1       42.8       72.3      131.3      
     AAh      20.8       28.2       42.9       72.4      131.4      
     ABh      20.8       28.2       43.0       72.5      131.4      
     ACh      20.9       28.3       43.0       72.5      131.5      
     ADh      21.0       28.3       43.1       72.6      131.6      
     AEh      21.0       28.4       43.1       72.6      131.6      
     AFh      21.1       28.4       43.2       72.7      131.7      
     B0h      21.1       28.5       43.2       72.7      131.7      
     B1h      21.2       28.6       43.3       72.8      131.8      
     B2h      21.2       28.6       43.4       72.9      131.8      
     B3h      21.3       28.7       43.4       72.9      131.9      
     B4h      21.4       28.7       43.5       73.0      132.0      
     B5h      21.4       28.8       43.5       73.0      132.0      
     B6h      21.5       28.8       43.6       73.1      132.1      
     B7h      21.5       28.9       43.7       73.1      132.1
     B8h      21.6       29.0       43.7       73.2      132.2      
     B9h      21.6       29.0       43.8       73.3      132.2      
     BAh      21.7       29.1       43.8       73.3      132.3      
     BBh      21.8       29.1       43.9       73.4      132.4      
     BCh      21.8       29.2       43.9       73.4      132.4      
     BDh      21.9       29.3       44.0       73.5      132.5      
     BEh      21.9       29.3       44.1       73.5      132.5      
     BFh      22.0       29.4       44.1       73.6      132.6      
     C0h      22.1       29.4       44.2       73.7      132.6      
     C1h      22.1       29.5       44.2       73.7      132.7      
     C2h      22.2       29.5       44.3       73.8      132.8      
     C3h      22.2       29.6       44.3       73.8      132.8      
     C4h      22.3       29.7       44.4       73.9      132.9      
     C5h      22.3       29.7       44.5       74.0      132.9      
     C6h      22.4       29.8       44.5       74.0      133.0      
     C7h      22.5       29.8       44.6       74.1      133.0      
     C8h      22.5       29.9       44.6       74.1      133.1      
     C9h      22.6       29.9       44.7       74.2      133.2      
     CAh      22.6       30.0       44.7       74.2      133.2      
     CBh      22.7       30.1       44.8       74.3      133.3      
     CCh      22.7       30.1       44.9       74.4      133.3
     CDh      22.8       30.2       44.9       74.4      133.4      

     Gap       N=0        N=1        N=2        N=3       N=4
     ---------------------------------------------------------
     CEh      22.9       30.2       45.0       74.5      133.5      
     CFh      22.9       30.3       45.0       74.5      133.5      
     D0h      23.0       30.3       45.1       74.6      133.6      
     D1h      23.0       30.4       45.2       74.6      133.6      
     D2h      23.1       30.5       45.2       74.7      133.7      
     D3h      23.1       30.5       45.3       74.8      133.7      
     D4h      23.2       30.6       45.3       74.8      133.8      
     D5h      23.3       30.6       45.4       74.9      133.9      
     D6h      23.3       30.7       45.4       74.9      133.9      
     D7h      23.4       30.8       45.5       75.0      134.0      
     D8h      23.4       30.8       45.6       75.0      134.0      
     D9h      23.5       30.9       45.6       75.1      134.1      
     DAh      23.6       30.9       45.7       75.2      134.1      
     DBh      23.6       31.0       45.7       75.2      134.2      
     DCh      23.7       31.0       45.8       75.3      134.3      
     DDh      23.7       31.1       45.8       75.3      134.3      
     DEh      23.8       31.2       45.9       75.4      134.4
     DFh      23.8       31.2       46.0       75.4      134.4      
     E0h      23.9       31.3       46.0       75.5      134.5      
     E1h      24.0       31.3       46.1       75.6      134.5      
     E2h      24.0       31.4       46.1       75.6      134.6      
     E3h      24.1       31.4       46.2       75.7      134.7      
     E4h      24.1       31.5       46.2       75.7      134.7      
     E5h      24.2       31.6       46.3       75.8      134.8      
     E6h      24.2       31.6       46.4       75.9      134.8      
     E7h      24.3       31.7       46.4       75.9      134.9      
     E8h      24.4       31.7       46.5       76.0      134.9      
     E9h      24.4       31.8       46.5       76.0      135.0      
     EAh      24.5       31.8       46.6       76.1      135.1      
     EBh      24.5       31.9       46.6       76.1      135.1      
     ECh      24.6       32.0       46.7       76.2      135.2      
     EDh      24.6       32.0       46.8       76.3      135.2      
     EEh      24.7       32.1       46.8       76.3      135.3      
     EFh      24.8       32.1       46.9       76.4      135.4      
     F0h      24.8       32.2       46.9       76.4      135.4      
     F1h      24.9       32.2       47.0       76.5      135.5      
     F2h      24.9       32.3       47.1       76.5      135.5      
     F3h      25.0       32.4       47.1       76.6      135.6
     F4h      25.0       32.4       47.2       76.7      135.6      
     F5h      25.1       32.5       47.2       76.7      135.7      
     F6h      25.2       32.5       47.3       76.8      135.8      
     F7h      25.2       32.6       47.3       76.8      135.8      
     F8h      25.3       32.7       47.4       76.9      135.9      
     F9h      25.3       32.7       47.5       76.9      135.9      
     FAh      25.4       32.8       47.5       77.0      136.0      
     FBh      25.5       32.8       47.6       77.1      136.0      
     FCh      25.5       32.9       47.6       77.1      136.1      
     FDh      25.6       32.9       47.7       77.2      136.2      
     FEh      25.6       33.0       47.7       77.2      136.2      
     FFh      25.7       33.1       47.8       77.3      136.3      
