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HS(4)                      Kernel Interfaces Manual                      HS(4)



NAME
       hs - RH11/RS03-RS04 fixed-head disk file

DESCRIPTION
       The  files  hs0  ...  hs7  refer to RJS03 disk drives 0 through 7.  The
       files hs8 ... hs15 refer to RJS04 disk drives 0 through 7.   The  RJS03
       drives  are  each 1024 blocks long and the RJS04 drives are 2048 blocks
       long.

       The hs files access the disk via the system's normal  buffering  mecha-
       nism  and  may  be  read  and  written  without regard to physical disk
       records.  There is also a `raw'  inteface  which  provides  for  direct
       transmission  between  the disk and the user's read or write buffer.  A
       single read or write call results in  exactly  one  I/O  operation  and
       therefore  raw  I/O  is considerably more efficient when many words are
       transmitted.  The names of the raw HS files begin with rhs.   The  same
       minor  device considerations hold for the raw interface as for the nor-
       mal interface.

       In raw I/O the buffer must begin on a word boundary, and counts  should
       be a multiple of 512 bytes (a disk block).  Likewise lseek calls should
       specify a multiple of 512 bytes.

FILES
       /dev/hs?, /dev/rhs?



                                                                         HS(4)