.TH HS 4 .SH NAMEhs \- RH11/RS03-RS04 fixed-head disk file.SH DESCRIPTIONThe files.I "hs0 ... hs7"refer toRJS03 disk drives 0 through 7.The files.I "hs8 ... hs15"refer toRJS04 disk drives 0 through 7.The RJS03 drives are each 1024 blocks long andthe RJS04 drives are 2048 blocks long..PPThe.I hsfilesaccess the disk via the system's normalbuffering mechanismand may be read and written without regard tophysical disk records.There is also a `raw' intefacewhich provides for direct transmission between the diskand the user's read or write buffer.A single read or write call results in exactly one I/O operationand therefore raw I/O is considerably more efficient whenmany words are transmitted.The names of the raw HS files begin with.IR rhs .The same minor device considerationshold for the raw interface as for the normal interface..PPIn raw I/O the buffer must begin on a word boundary,and counts should be a multiple of 512 bytes(a disk block).Likewise.I lseekcalls should specify a multiple of 512 bytes..SH FILES/dev/hs?, /dev/rhs?