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+.TH UP 4
+.SH NAME
+up \- emulex sc21/ampex 9300 UNIBUS moving head disk
+.SH DESCRIPTION
+Files with minor device numbers 0 through 7 refer to various portions
+of drive 0;
+minor devices 8 through 15 refer to drive 1, etc.
+.PP
+The origin and size of the pseudo-disks on each drive are
+as follows:
+.PP
+.ta .5i +\w'000000    'u +\w'000000    'u
+.nf
+9300 partitions
+	disk	start	byte
+	0	0	15884
+	1	16416	33440
+	2	0	500992
+	3	341696	15884
+	4	358112	55936
+	5	414048	36944
+	6	341696	159296
+	7	49856	291346
+.DT
+.fi
+.PP
+The
+block
+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 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 files
+conventionally
+begin with
+an extra `r.'
+.SH FILES
+.ta 2i
+/dev/up[0-3][a-h]	block files
+.br
+/dev/rup[0-3][a-h]	raw files
+.SH SEE ALSO
+rp(4)
+.SH BUGS
+In raw I/O
+.I read
+and
+.IR write (2)
+truncate file offsets to 512-byte block boundaries,
+and
+.I write
+scribbles on the tail of incomplete blocks.
+Thus,
+in programs that are likely to access raw devices,
+.I read, write
+and
+.IR lseek (2)
+should always deal in 512-byte multiples.