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HK(4)											    HK(4)

       hk - RK6-11/RK06 and RK07 moving head disk

	    NHK  hk_drives # RK611, RK06/07

	    #Name Unit# Addr   Vector Br Handler(s)	 # Comments
	    hk	  ?	177440 210    5  hkintr 	 # rk611/711 rk06/07

       major device number(s):
	    raw: 13
	    block: 4
       minor device encoding:
	    bits 0007 specify partition of HK drive
	    bits 0070 specify HK drive

       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.  The standard device names begin  with  ``hk''
       followed  by  the drive number and then a letter a-h for partitions 0-7 respectively.  The
       character ? stands here for a drive number in the range 0-7.

       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  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
       files conventionally begin with an extra `r.'

       In  raw I/O the buffer must begin on a word (even) boundary, and counts should be a multi-
       ple of 512 bytes (a disk sector).  Likewise seek calls should specify a	multiple  of  512

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

       RK06 partitions:
	    disk   start  length       cyls  comments
	    hk?a       0    8316    0 - 125  root
	    hk?b    8316    8316  126 - 251  swap
	    hk?c       0   27126    0 - 410* whole pack plus badsect track
	    hk?d  unused
	    hk?e  unused
	    hk?f  unused
	    hk?g   16632   10428  251 - 409  tmp
	    hk?h       0   27060    0 - 409  whole pack minus badsect track

       RK07 partitions:
	    disk   start  length       cyls  comments
	    hk?a       0    8316    0 - 125  root
	    hk?b    8316    8316  126 - 251  swap
	    hk?c       0   53790    0 - 814* whole pack plus badsect track
	    hk?d  unused
	    hk?e  unused
	    hk?f  unused
	    hk?g   16632   37092  252 - 813
	    hk?h       0   53724    0 - 814  whole pack minus badsect track

       Those  partitions  marked  with	an asterisk (``*'') allow access to bad block information
       stored at the end of some packs.  Extreme care must be taken when creating file systems on
       these  partitions  to avoid overwriting any bad block information present.  I general it's
       best to use newfs(8) to create file systems since it uses  the  ``safe''  partition  sizes
       recored in /etc/disktab.

       /dev/hk[0-7][a-h]   block files
       /dev/rhk[0-7][a-h]  raw files
       /dev/MAKEDEV	   script to create special files
       /dev/MAKEDEV.local  script to localize special files

       ra(4), ram(4), rk(4), rl(4), rx(4), si(4), xp(4), dtab(5), autoconfig(8)

       hk%d%c: hard error sn%d cs2=%b ds=%b er=%b.  An unrecoverable error occurred during trans-
       fer of the specified sector of the specified disk partition.  The contents of the cs2,  ds
       and  er	registers are printed in octal and symbolically with bits decoded.  The error was
       either unrecoverable, or a large number of retry attempts  (including  offset  positioning
       and drive recalibration) could not recover the error.

       hk%d:  write  locked.   The  write  protect  switch  was set on the drive when a write was
       attempted.  The write operation is not recoverable.

       hk%d: not ready.  The drive was spun down or off line when it was accessed.  The i/o oper-
       ation is not recoverable.

       hk%d:  not  ready  (came  back!).  The drive was not ready, but after printing the message
       about being not ready (which takes a fraction of a second) was ready.   The  operation  is
       recovered if no further errors occur.

       hk%d%c:	soft  ecc  sn%d.  A recoverable ECC error occurred on the specified sector of the
       specified disk partition.  This happens normally a few times a week.  If it  happens  more
       frequently than this the sectors where the errors are occuring should be checked to see if
       certain cylinders on the pack, spots on the carriage of the drive or heads are indicated.

       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.

       DEC-standard error logging should be supported.

       A program to analyze the logged error information (even in its present  reduced	form)  is

       The  partition  tables  for  the file systems should be read off of each pack, as they are
       never quite what any single installation would prefer, and this would make packs more por-

3rd Berkeley Distribution		 January 3, 1993				    HK(4)
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