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fdisk                        Command                        fdisk




Hard-disk partitioning utility

/eettcc/ffddiisskk [-rr] [-cc] [-bb _m_b_o_o_t] _x_d_e_v

The command ffddiisskk  supports flexible hard-disk partitioning among
various  operating  systems  (e.g.  MS-DOS, CP/M,  COHERENT,  and
XENIX).  This capability  means that up to four operating systems
can  be  supported  on  one  hard  disk.   ffddiisskk  recognizes  the
following flags:

-rr Read-only access to partitioning information.

-bb Use  the first  446  bytes of  _m_b_o_o_t  as master  boot code  to
   replace that in _x_d_e_v.

-cc Allow  the specification  of  disk geometry  (i.e., number  of
   cylinders,  heads,  sectors)  for  disk  drives that  are  not
   supported by the system BIOS.

ffddiisskk  accesses the  first  block from  the  special device  _x_d_e_v
(e.g., /dev/at0x)  for the partitioning  information.  ffddiisskk then
queries the user for  changes.  These changes are written to _x_d_e_v
only if  the user requests the changes to  be saved.  If omitted,
_x_d_e_v defaults to  /ddeevv/aatt00xx and /ddeevv/aatt11xx. SCSI disk device users
will  need  to specify  _x_d_e_v  as  /ddeevv/ssdd_nxx where  _n  is a  digit
corresponding  to  the   SCSI  ID  for  the  disk  device  (e.g.,
/ddeevv/ssdd00xx).

***** Files *****

<ffddiisskk.hh>

***** See Also *****

ccoommmmaannddss

***** NNootteess *****

IIff tthhee ppaarrttiittiioonn ttaabbllee iiss cchhaannggeedd, tthhee ssyysstteemm sshhoouulldd bbee rreebbooootteedd;
mmoosstt  ddeevviiccee ddrriivveerrss  wwiillll  nnoott rreeccooggnniizzee  tthhee rreevviisseedd  ppaarrttiittiioonn
iinnffoorrmmaattiioonn uunnttiill aa rreebboooott ooccccuurrss.

AAss tthhee  -rr and  -bb options  are contradictory, attempting  to use
them together generates an error message.

Please  note that  some  versions of  ffddiisskk  for other  operating
systems  can rearrange  the  order of  entries  in the  partition
table.  If this happens, you may lose the ability to run COHERENT
until the  table is  restored to its  previous order.  A  sign of
this problem is getting the  prompt AATT bboooott? when trying to start
COHERENT after  running any ffddiisskk program, and  not being able to
get past it.




COHERENT Lexicon                                           Page 1




fdisk                        Command                        fdisk



Computer  systems  that   use  older  BIOS  releases  may  report
incorrect disk  parameters.  Users of such  systems should change
the CMOS  setup values  if possible, but  the BIOS on  some older
systems will  not allow you to specify  arbitrary values for disk
parameters.  Users with such  systems can use the ffddiisskk -cc option
instead.

If you  plan to install and  run COHERENT and MS-DOS  on the same
hard disk, note the following:

->   If you wish to install  COHERENT and MS-DOS on the same hard
     drive, you _m_u_s_t run the MS-DOS ffddiisskk first!

->   If  you plan  on running  both  operating systems,  you _m_u_s_t
     install MS-DOS  first and leave  some free cylinders  on the
     disk for COHERENT as well as a free partition.  You can have
     both primary  as well as  extended MS-DOS partitions  on the
     same  drive as  COHERENT,  but COHERENT  cannot  use a  sub-
     partition of  the MS-DOS extended  partition.  COHERENT must
     have one of the four _r_e_a_l partitions.

_F_a_i_l_u_r_e _t_o _o_b_s_e_r_v_e _t_h_e_s_e _r_u_l_e_s _w_i_l_l _r_e_s_u_l_t _i_n _l_o_s_s _o_f _d_a_t_a



































COHERENT Lexicon                                           Page 2

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