1RK(4) Kernel Interfaces Manual RK(4)
2
6 rk - RK-11/RK05 disk
7
9 /sys/conf/SYSTEM:
10 NRK rk_drives # RK05
11 /etc/dtab:
13 #Name Unit# Addr Vector Br Handler(s) # Comments
14 rk ? 177400 220 5 rkintr # rk05
15 major device number(s):
17 raw: 15
18 block: 6
19 minor device encoding:
20 specifies drive: <rk_drive>
21
23 Minor device numbers are drive numbers on one controller. The standard
24 device names begin with ``rk'' followed by the drive number and then
25 the letter "h". The character ? stands here for a drive number in the
26 range 0-7.
27 The block files access the disk via the system's normal buffering mech‐
29 anism and may be read and written without regard to physical disk
30 records. There is also a `raw' interface which provides for direct
31 transmission between the disk and the user's read or write buffer. A
32 single read or write call results in exactly one I/O operation and
33 therefore raw I/O is considerably more efficient when many words are
34 transmitted. The names of the raw files conventionally begin with an
35 extra `r.'
36 In raw I/O the buffer must begin on a word (even) boundary, and counts
38 should be a multiple of 512 bytes (a disk sector). Likewise seek calls
39 should specify a multiple of 512 bytes.
40
42 The rk driver does not support pseudo-disks (partitions). Each file
43 rk?h refers to the entire drive as a single sequentially addressed
44 file. Each drive has 4872 512-byte blocks.
45 It's not clear what one would do with one of these drives if one had
47 one ...
48
50 /dev/rk[0-7]h block files
51 /dev/rrk[0-7]h raw files
52 /dev/MAKEDEV script to create special files
53 /dev/MAKEDEV.local script to localize special files
54
56 hk(4), ra(4), ram(4), rl(4), rp(4), rx(4), si(4), xp(4), dtab(5), auto‐
57 config(8)
58
60 rk%d: hard error sn%d er=%b ds=%b. An unrecoverable error occurred
61 during transfer of the specified sector of the specified disk. The
62 contents of the two error registers are also printed in octal and sym‐
63 bolically with bits decoded. The error was either unrecoverable, or a
64 large number of retry attempts could not recover the error.
65 rk%d: write locked. The write protect switch was set on the drive when
67 a write was attempted. The write operation is not recoverable.
68
70 In raw I/O read and write(2) truncate file offsets to 512-byte block
71 boundaries, and write scribbles on the tail of incomplete blocks.
72 Thus, in programs that are likely to access raw devices, read, write
73 and lseek(2) should always deal in 512-byte multiples.
74 DEC-standard error logging should be supported.
76 A program to analyze the logged error information (even in its present
78 reduced form) is needed.
793rd Berkeley Distribution August 20, 1987 RK(4)