From owner-doc-jp@jp.freebsd.org  Wed Apr 17 18:19:38 1996
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In-reply-to: <199604160910.SAA20608@kinokuniya.TokyoNet.AD.JP> (message from Yukihiro Nakai on Tue, 16 Apr 1996 18:10:47 +0900)
From: asami@cs.berkeley.edu (Satoshi Asami)
Reply-To: doc-jp@jp.freebsd.org
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Subject: [doc-jp 100] Re: The Muzui Basho
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 * 	$B$J$+$$!wElBg$G$9!#(B

$B@u8+!w85ElBg(B $B$G$9!#(B(^_^;)

 * 	block device$B$N$+$o$j$K(Braw device$B$r;H$&!"$H$"$j$^$9$,!"(B
 * 	$B2?$N$3$H$G!"$I$N$h$&$KLu$;$P$$$$$N$G$7$g$&!#(B
 * 	$B$o$+$kJ}$O$I$&$>65$($F2<$5$$!#(B

$B;d$N$H$3$m$G$OI,$:%9%i%$%9%F!<%V%k!J(BDOS$B$G8@$&%Q!<%F%#%7%g%s%F!<%V%k!K(B
$B$r;H$&$h$&$K$7$F$$$k$N$G!"%G%#%9%/$r$=$N$^$^;H$&$K$O$I$&$7$?$i$$$$$+$O(B
$B<B$O$h$/$o$+$C$F$$$J$$$N$G$9$,!"0l1~Lu$7$F$_$^$9!#(B

 * 	  $B$$$C$?$$$I$s$J$3$H$r$d$i$+$7$F$7$^$C$?$N$G$7$g$&!)(B
                              ^^^^^^^^^^
 (^_^;)

 * 	  $B$O$8$a$N(B <tt/-r/ $B$O?7$7$$%i%Y%k$r=q$-9~$`$N$KI,MW$G!"%V%m%C%/%G%P%$%9(B
 * 	  $B$NBe$o$j$K%m%&%G%P%$%9$r;H$&$3$H$O$9$0$l$?9)IW$G$9!#(B

$B!V%m%&%G%P%$%9!W$C$F0l=V2?$N$3$H$+$H;W$$$^$7$?!#(B(^_^;)

 * 									    To
 *           be ``empty'' the disk should have 0's at critical points on the
 *           first two sectors.

$B!V>e$G!X2?$bF~$C$F$$$J$$!Y$H=q$-$^$7$?$,!"%G%#%9%/$K2?$bF~$C$F$$$J$$$H(B
  $BH=CG$5$l$k$?$a$K$O:G=i$NFs$D$N%;%/%?$NFCDj$N2?2U=j$+$K(B 0$B$,F~$C$F$$$k(B
  $BI,MW$,$"$j$^$9!#!W(B

 * 				 In particular, the 2 byte signature at the
 *           end of the first sector must not be <tt/0xaa55/ or the disk will
 *           be interpreted as having a slice (partition) table and it will be
 *           difficult to write to it where you want unless the slice table is
 *           initialized correctly.

$B!VFC$KLdBj$K$J$k$N$,:G=i$N%;%/%?$N:G8e$NFs%P%$%H$G$9!#$3$3$K(B 0xaa55
  $B!J$*$*!"(BBSD$B%Q!<%F%#%7%g%s$r<($9(Ba5$B$N7+$jJV$7$G$9$M(B ^_^;$B!K$,F~$C$F$$$k(B
  $B$N$O$3$N%G%#%9%/$K%9%i%$%9!J%Q!<%F%#%7%g%s!K%F!<%V%k$,$"$k$H$$$&0u$G(B
  $B$9!#$=$&$J$k$H!"%9%i%$%9%F!<%V%k$,@5$7$/=i4|2=$5$l$F$$$J$$$H$3$N%G%#(B
  $B%9%/$r$A$c$s$H;HMQ$9$k$N$O:$Fq$G$9!#!W(B

 *   				     All bootable hard disks will have the
 *           <tt/0xaa55/ signature so they won't be empty.  Empty disks may be
 *           created by copying zeros over the first 2 sectors:

$B!V%V!<%H$G$-$k%O!<%I%G%#%9%/$K$OI,$:(B 0xaa55$B$N0u$,F~$C$F$$$^$9$N$G!"(B
  $B!X2?$bF~$C$F$$$J$$!Y>uBV$K$O$J$jF@$^$;$s!#%G%#%9%/$NFbMF$r!X>C5n!Y$9(B
  $B$k$?$a$K$O:G=i$NFs%;%/%?$K(B 0$B$r$:$i!<$C$H=q$-9~$s$G$d$l$P$$$$$@$1$G$9(B:

 *           <verb>
 *             dd if=/dev/zero of=/dev/rsd1 bs=1k count=1
 *           </verb>

$B$3$s$J$b$s$G$I$&$G$7$g$&$+!#(B

$B:#(B $B86K\$r8+$F$$$^$9$,!"$^$@$^$@B3$-$,$"$j$^$9$M!#$3$l$O7k9=BgJQ$=$&$G(B
$B$9$,!"%K%e!<%9%0%k!<%WEy$G$N(B FAQ$B$NBeI=$G$9$N$G4hD%$C$F2<$5$$!#(B;)

$B$"$5$_(B
