From owner-man-jp-reviewer@jp.freebsd.org  Fri Jun 12 00:26:35 1998
Received: (from daemon@localhost)
	by jaz.jp.freebsd.org (8.8.8+3.0Wbeta13/8.7.3) id AAA03368;
	Fri, 12 Jun 1998 00:26:35 +0900 (JST)
	(envelope-from owner-man-jp-reviewer@jp.FreeBSD.org)
Received: from g-alphas1.strl.nhk.or.jp ([133.127.16.96])
	by jaz.jp.freebsd.org (8.8.8+3.0Wbeta13/8.7.3) with ESMTP id AAA03354
	for <man-jp-reviewer@jp.freebsd.org>; Fri, 12 Jun 1998 00:26:27 +0900 (JST)
	(envelope-from kumano@strl.nhk.or.jp)
Received: from strl.nhk.or.jp (localhost [127.0.0.1]) by g-alphas1.strl.nhk.or.jp (8.8.5+2.7Wbeta5/3.5Wpl4-02/06/97) with ESMTP id AAA18033 for man-jp-reviewer@jp.freebsd.org; Fri, 12 Jun 1998 00:25:48 +0900 (JST)
Message-Id: <199806111525.AAA18033@g-alphas1.strl.nhk.or.jp>
To: man-jp-reviewer@jp.freebsd.org
In-Reply-To: Your message of "Thu, 11 Jun 1998 10:05:03 +0900"
References: <199806110105.KAA03961@toto.noc.titech.ac.jp>
X-Mailer: Mew version 1.70 on Emacs 19.34.1 / Mule 2.3
Mime-Version: 1.0
Content-Type: Text/Plain; charset=iso-2022-jp
Content-Transfer-Encoding: 7bit
Date: Fri, 12 Jun 1998 00:25:48 +0900
From: "KUMANO, Tadashi (=?ISO-2022-JP?B?GyRCNydMbiEhQDUbKEI=?=)" <kumano@strl.nhk.or.jp>
Reply-To: man-jp-reviewer@jp.freebsd.org
Precedence: list
X-Distribute: distribute [version 2.1 (Alpha) patchlevel=24]
X-Sequence: man-jp-reviewer 220
Subject: [man-jp-reviewer 220] Re: (Checked) fs.5 
Errors-To: owner-man-jp-reviewer@jp.freebsd.org
Sender: owner-man-jp-reviewer@jp.freebsd.org

> MINBSIZE$B$,(B 4096 $B$"$l$P(B
> 2 $BCJ$^$G$N(B($B%V%m%C%/(B)$B4V@\;2>H$r;H$C$F(B
> 2^32 $B$NBg$-$5$N%U%!%$%k$r:n$k$3$H$,$G$-$^$9!#(B
> 
> $B$+$J!#(B

$B$3$N@~$G$$$-$^$9!%(B

$B$"$H!$;d$N=$@5$G<+?.$,$J$$(B($B$H$$$&$+$5$C$Q$j$o$+$C$F$J$$(B)$BItJ,$O(B
$B$3$N$"$?$j$J$s$G$9$,!$$I$&$G$7$g$&(B?

---
Large files consist of exclusively large data blocks.  To avoid
undue wasted disk space, the last data block of a small file is
allocated as only as many fragments of a large block as are
necessary.  The file system format retains only a single pointer
to such a fragment, which is a piece of a single large block that
has been divided. 

-$BBg$-$J%U%!%$%k$O!"Hs>o$KBg$-$J%G!<%?%V%m%C%/$+$i@.$j$^$9!#(B
-$B%G%#%9%/%9%Z!<%9$NO2Hq$rHr$1$k$?$a$K!">.$5$J%U%!%$%k$N(B
-$B:G8e$N%G!<%?%V%m%C%/$O!"I,MW$K$h$C$FBg$-$J%V%m%C%/$NB?$/$N%U%i%0%a%s%H(B
-$B$HF1MM$K$=$l0l$D$@$1$G3NJ]$5$l$^$9!#(B
-$B%U%!%$%k%7%9%F%`%U%)!<%^%C%H$O!"$=$N$h$&$J%U%i%0%a%s%H$X$NC10l$N(B
-$B%]%$%s%?$rJ];}$7!"%U%i%0%a%s%H$OJ,3d$5$l$?C10l$NBg$-$J%V%m%C%/JR$G$9!#(B
+$BBg$-$J%U%!%$%k$O!"Hs>o$KBg$-$J%G!<%?%V%m%C%/$+$i$J$j$^$9!#(B
+$B%G%#%9%/%9%Z!<%9$N2aEY$NO2Hq$rHr$1$k$?$a$K!">.$5$J%U%!%$%k$N(B
+$B:G8e$N%G!<%?%V%m%C%/$O!"(B
+$BC1$KBg$-$J%V%m%C%/$N$G$-$k$@$1B?$/$N%U%i%0%a%s%H$,I,MW$H$J$k$h$&$K(B
+$BG[CV$5$l$^$9!#(B
+$B%U%!%$%k%7%9%F%`%U%)!<%^%C%H$O!"$=$N$h$&$J!"0l$D$NBg$-$J%V%m%C%/$,(B
+$BJ,3d$5$l$?0lJR$G$"$k%U%i%0%a%s%H$N0l$D$X$N%]%$%s%?$rJ];}$7$^$9!#(B
---

---
Each cylinder keeps track of the availability of blocks at different
rotational positions, so that sequential blocks can be laid out
with minimum rotational latency. With the default of 8 distinguished
rotational positions, the resolution of the
summary information is 2ms for a typical 3600 rpm drive.

-$B3F%7%j%s%@$O0[$J$k2sE>0LCV$G%V%m%C%/$r<hF@$9$k%H%i%C%/$r(B
-$BJ];}$9$k$N$G!"O"B3$7$?%V%m%C%/$O:G>.$N2sE>CY$l$GG[CV$9$k$3$H$,$G$-$^$9!#(B
-$B%G%U%)%k%H$N(B 8 $B$ONI9%$J2sE>0LCV$G$"$j!"Am3g>pJs$NJ,2rG=$O(B
-$BE57?E*$J(B 3600 $B2sE>$N%I%i%$%V$G(B 2ms $B$K$J$j$^$9!#(B
+$BO"B3$7$?%V%m%C%/$r:G>.$N2sE>CY$l$GG[CV$9$k$3$H$,$G$-$k$h$&!"(B
+$B3F%7%j%s%@$O0[$J$k2sE>0LCV$G$NMxMQ2DG=$J%V%m%C%/?t$rJ];}$7B3$1$^$9!#(B
+$B%G%U%)%k%H$G$O2sE>0LCV$r(B 8 $BJ,3d$GI=$7!"$3$N$H$-$NAm3g>pJs$NJ,2rG=$O(B
+$BE57?E*$J(B 3600 rpm $B$N%I%i%$%V$G(B 2ms $B$K$J$j$^$9!#(B
---

---
The size of the tables is
increased when sector sizes are not powers of two,
as this increases the number of cylinders
included before the rotational pattern repeats
.Pq Fa fs_cpc .

+$B%;%/%?%5%$%:$,(B 2 $B$N$Y$->h$G$J$$$H$-$K$O!"<~2s%Q%?!<%s$r(B
 .Pq Fa fs_cpc
-$B$r7+$jJV$9A0$K4^$^$l$F$$$?%7%j%s%@?t$rA}$d$9$h$&$K!"(B
-$B%;%/%?%5%$%:$,(B 2 $BG\$G$J$$>l9g$KA}$($^$9!#(B
-$B2sE>%l%$%"%&%H%F!<%V%k$NBg$-$5$O!"(B
+$B$@$17+$jJV$9$^$G$K4^$^$l$k%7%j%s%@?t$,A}2C$9$k$N$G!"(B
+$BF1MM$K%F!<%V%k$NBg$-$5$bA}2C$7$^$9!#(B
---

-- 
 kumano@strl.nhk.or.jp
 $B$/$^$N!w#N#H#KJ|Aw5;=Q8&5f=j(B
