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Unix Version 7 - man page for rp (v7 section 4)

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RP(4)											    RP(4)

       rp - RP-11/RP03 moving-head disk

       The  files rp0 ... rp7 refer to sections of RP disk drive 0.  The files rp8 ... rp15 refer
       to drive 1 etc.	This allows a large disk to be broken up into more manageable pieces.

       The origin and size of the pseudo-disks on each drive are as follows:

	    disk start	   length
	    0	 0    81000
	    1	 0    5000
	    2	 5000 2000
	    3	 7000 74000
	    4-7  unassigned

       Thus rp0 covers the whole drive, while rp1, rp2, rp3 can serve usefully as a  root,  swap,
       and mounted user file system respectively.

       The  rp	files access the disk via the system's normal buffering mechanism and may be read
       and written without regard to physical disk records.  There  is	also  a  `raw'	interface
       which  provides for direct transmission between the disk and the user's read or write buf-
       fer.  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
       RP files begin with rrp and end with a number which selects the same disk section  as  the
       corresponding rp file.

       In raw I/O the buffer must begin on a word boundary.

       /dev/rp?, /dev/rrp?


       In raw I/O read and write(2) truncate file offsets to 512-byte block boundaries, and write
       scribbles on the tail of incomplete blocks.  Thus, in programs that are likely  to  access
       raw devices, read, write and lseek(2) should always deal in 512-byte multiples.

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