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 buffer-
ing mechanism 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 inter-
face as for the normal 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 seek calls should specify a multiple of 512 bytes.
FILES
/dev/hs?, /dev/rhs?
BUGS
1