=========================================================
ϡ
Linux-2.6.29/Documentation/filesystems/vfat.txt 
Ǥ
Ρ JF ץ < http://www.linux.or.jp/JF/ >
  2009/06/03
  Seiji Kaneko < skaneko at mbn dot or dot jp >
  Kouichi Nomoto < hng at ps dot sksy dot ne dot jp >
ɼ : Matsukura <nbh--mats at nifty dot com >
=========================================================
#USING VFAT
VFAT Ȥ
----------------------------------------------------------------------
#To use the vfat filesystem, use the filesystem type 'vfat'.  i.e.
vfat ե륷ƥȤˤϡե륷ƥॿפ vfat ꤷƤ
Ĥޤꡢ

  mount -t vfat /dev/fd0 /mnt

#No special partition formatter is required.  mkdosfs will work fine
#if you want to format from within Linux.
ȤƤ̤ʥѡƥΥեޥåɬפޤLinux 
եޥåȤԤˤϡmkdosfs ѤФ褤Ǥ礦

#VFAT MOUNT OPTIONS
VFAT ޥȥץ
----------------------------------------------------------------------
#uid=###       -- Set the owner of all files on this filesystem.
#		 The default is the uid of current process.
uid=###       -- Υե륷ƥեΥʤ򥻥åȤ롣
		ͤϸߤΥץ uid Ǥ

#gid=###       -- Set the group of all files on this filesystem.
#		 The default is the gid of current process.
gid=###       -- Υե륷ƥեΥ롼פ򥻥åȤ롣
		ͤϸߤΥץ gid Ǥ롣

#umask=###     -- The permission mask (for files and directories, see umask(1)).
#                 The default is the umask of current process.
umask=###     -- ѡߥåޥ (եڤӥǥ쥯ȥꡣumask(1) 
		)ͤϸߤΥץ umask Ǥ롣

#dmask=###     -- The permission mask for the directory.
#                 The default is the umask of current process.
dmask=###     -- ǥ쥯ȥФѡߥåޥ
                 ͤϸߤΥץ umask Ǥ롣

#fmask=###     -- The permission mask for files.
#                 The default is the umask of current process.
fmask=###     -- եФѡߥåޥ
                 ͤϸߤΥץ umask Ǥ롣

#allow_utime=### -- This option controls the permission check of mtime/atime.
allow_utime=### -- Υץ mtime/atime Υѡߥåå
		椹롣

#                  20 - If current process is in group of file's group ID,
#                       you can change timestamp.
#                   2 - Other users can change timestamp.
                  20 - ߤΥץ ID եΥ롼 ID °
		       硢ॹפѹĤ롣
                   2 - ¾Υ桼˥ॹפѹ

#                 The default is set from `dmask' option. (If the directory is
#                 writable, utime(2) is also allowed. I.e. ~dmask & 022)
		ɸͤ dmask ץꤵ줿ͤǤ롣ǥ쥯
		꤬񤭹߲ǽʤСutime(2) 롣Ĥޤꡢ
		~dmask & 022 Ȥ롣

#                 Normally utime(2) checks current process is owner of
#                 the file, or it has CAP_FOWNER capability.  But FAT
#                 filesystem doesn't have uid/gid on disk, so normal
#                 check is too unflexible. With this option you can
#                 relax it.
		̾ utime(2) ϸߤΥץեΥʤǤ뤫
		ޤϸߤΥץ CAP_FOWNER ¤Ĥɤ
		ΥåԤFAT ե륷ƥϥǥ 
		uid/gid ʤᡢ̾ΥåϤޤˤ
		˳Υץˤꡢ꤬¤롣

#codepage=###  -- Sets the codepage number for converting to shortname
#		 characters on FAT filesystem.
#		 By default, FAT_DEFAULT_CODEPAGE setting is used.
codepage=###  -- FAT ե륷ƥǡû̾פѴʸ
                 ɥڡꤹ롣ͤϡ
		FAT_DEFAULT_CODEPAGE ͤȤ롣

#iocharset=<name> -- Character set to use for converting between the
#		 encoding is used for user visible filename and 16 bit
#		 Unicode characters. Long filenames are stored on disk
#		 in Unicode format, but Unix for the most part doesn't
#		 know how to deal with Unicode.
#		 By default, FAT_DEFAULT_IOCHARSET setting is used.
iocharset=<name> -- 桼鸫ե̾Ѥ륨󥳡ǥ󥰤ȡ
		16 ӥå Unicode ʸ֤ѴѤʸꤹ롣
		Long filename ϥǥ Unicode ʸȤƳǼ
		Ƥ뤬Unix ĶΤۤȤɤʬ Unicode ν
		ˡ򤷤Ƥʤ

#		 There is also an option of doing UTF-8 translations
#		 with the utf8 option.
		utf8 ץˤ UTF-8 ѴԤץ󶡤
		Ƥ롣
#		 NOTE: "iocharset=utf8" is not recommended. If unsure,
#		 you should consider the following option instead.
		աiocharset=utf8 ȤϿ侩ʤԳΤ
		ˤϡΥץ˻ȤȤƤ줿

#utf8=<bool>   -- UTF-8 is the filesystem safe version of Unicode that
#		 is used by the console.  It can be enabled for the
#		 filesystem with this option. If 'uni_xlate' gets set,
#		 UTF-8 gets disabled.
utf8=<bool>   -- UTF-8 ϥե륷ƥǰ˻ѤǤ Unicode ž
		ǡ󥽡ǻѤƤ롣ե륷ƥ
		ƤϡΥץꤹ뤳ȤˤͭȤǤ롣
		uni_xlate ꤵƤ硢UTF-8 ̵Ȥʤ롣

#uni_xlate=<bool> -- Translate unhandled Unicode characters to special
#		 escaped sequences.  This would let you backup and
#		 restore filenames that are created with any Unicode
#		 characters.  Until Linux supports Unicode for real,
#		 this gives you an alternative.  Without this option,
#		 a '?' is used when no translation is possible.  The
#		 escape character is ':' because it is otherwise
#		 illegal on the vfat filesystem.  The escape sequence
#		 that gets used is ':' and the four digits of hexadecimal
#		 unicode.
uni_xlate=<bool> -- ʸǰȤΤǤʤ Unicode ʸü
		ץ󥹤Ѵ롣ˤꡢǤդ 
		Unicode ʸޤե̾Хååסꥹ
		ǽȤʤ롣Linux  Unicode ˥ݡȤޤǤϡ
		εǽؤȤʤ롣Υץꤷʤ硢
		Ǥʤˤ '?' Ȥ롣ʸϡ':'
		Ȥʤ뤬¾ξǤϤʸ vfat ե륷
		ƥǤʸȤʤ뤿Ǥ롣Ȥ륨ץ
		󥹤ϡ':' ȡθ 4  16 ʿɽ蘆줿
		Unicode ʸ³ΤǤ롣

#nonumtail=<bool> -- When creating 8.3 aliases, normally the alias will
#                 end in '~1' or tilde followed by some number.  If this
#                 option is set, then if the filename is 
#                 "longfilename.txt" and "longfile.txt" does not
#                 currently exist in the directory, 'longfile.txt' will
#                 be the short alias instead of 'longfi~1.txt'. 
nonumtail=<bool> -- 8.3 ̾ݡ̾κǸ̾ ~1 
		ɤθ˿ĤΤˤʤ롣Υץ󤬥å
		Ƥ硢㤨Хե̾ "longfilename.txt" 
		ꡢƱǥ쥯ȥ "longfile.txt" Ȥ̾Υե
		뤬¸ߤʤʤСû̾ "longfi~1.txt" ǤϤ
		 "longfile.txt" ˤʤ롣 
                  
#usefree       -- Use the "free clusters" value stored on FSINFO. It'll
#                 be used to determine number of free clusters without
#                 scanning disk. But it's not used by default, because
#                 recent Windows don't update it correctly in some
#                 case. If you are sure the "free clusters" on FSINFO is
#                 correct, by this option you can avoid scanning disk.
usefree       -- FSINFO ˳ǼƤ֥ե꡼饹פͤѤ롣
		ϥǥ򥹥󤹤뤳Ȥʤե꡼饹ο
		ȽǤΤ˻Ȥ롣ϴǤϻѤʤ
		ȤΤϺǶ Windows Ϥͤʤ
		뤿Ǥ롣FSINFO Ρ֥ե꡼饹פͤ
		Ȥ˼ʤ顢ΥץˤǥΥ
		򤱤뤳ȤǤ롣

#quiet         -- Stops printing certain warning messages.
quiet         -- ηٹåνϤ޻ߤ롣

#check=s|r|n   -- Case sensitivity checking setting.
#                 s: strict, case sensitive
#                 r: relaxed, case insensitive
#                 n: normal, default setting, currently case insensitive
check=s|r|n   -- ʸȾʸζ̤󤹤
                 s: ̩ʸȾʸ̤롣
                 r: ¡ʸȾʸ̤ʤ
                 n: ɸࡣͤǤꡢߤʸȾʸ̤ʤ

#nocase        -- This was deprecated for vfat. Use shortname=win95 instead.
nocase        --  vfat Ǥѻͽꡣ shortname=win95 
		ȡ

#shortname=lower|win95|winnt|mixed
#	      -- Shortname display/create setting.
#		 lower: convert to lowercase for display,
#			emulate the Windows 95 rule for create.
#		 win95: emulate the Windows 95 rule for display/create.
#		 winnt: emulate the Windows NT rule for display/create.
#		 mixed: emulate the Windows NT rule for display,
#			emulate the Windows 95 rule for create.
#		 Default setting is `lower'.
shortname=lower|win95|winnt|mixed
	      -- û̾ɽӺ˴ؤ
		 lower: ɽϾʸѴ롣
			 Windows 95 ε§ϤưԤ
		 win95: ɽȤ Windows 95 ε§ϤưԤ
		 winnt: ɽȤ Windows NT ε§ϤưԤ
		 mixed: ɽ Windows NT ε§ϤưԤ
			 Windows 95 ε§ϤưԤ
		 ͤ `lower' Ǥ롣

#tz=UTC        -- Interpret timestamps as UTC rather than local time.
#                 This option disables the conversion of timestamps
#                 between local time (as used by Windows on FAT) and UTC
#                 (which Linux uses internally).  This is particularly
#                 useful when mounting devices (like digital cameras)
#                 that are set to UTC in order to avoid the pitfalls of
#                 local time.
tz=UTC        -- ॹפǤϤʤUTC ȤƲ᤹롣
		Υץϡ (Windows  FAT Ф
		)  UTC (Linux ŪѤ) ֤Ѵ̵
		롣ä˥ǥ륫Τ褦ʡ
		򤱤뤿 UTC ꤷƤ褦ʥǥХޥ
		ȤݤΩġ

#showexec      -- If set, the execute permission bits of the file will be
#		 allowed only if the extension part of the name is .EXE,
#		 .COM, or .BAT. Not set by default.
showexec      -- åȤƤ硢եμ¹°ӥåȤϳĥ̾
		.EXE, .COM ޤ .BAT ǤΤߵĤ롣Ǥ
		åȤƤʤ

#debug         -- Can be set, but unused by the current implementation.
debug         -- åȤϲǽߤμǤϻȤƤʤ

#sys_immutable -- If set, ATTR_SYS attribute on FAT is handled as
#		 IMMUTABLE flag on Linux. Not set by default.
sys_immutable -- åȤƤ硢FAT  ATTR_SYS ȥӥ塼Ȥ
		Linux  IMMUTABLE ե饰Ȥư롣ǤϥåȤ
		Ƥʤ

#flush         -- If set, the filesystem will try to flush to disk more
#		 early than normal. Not set by default.
flush         -- åȤƤ硢ե륷ƥɸ᤯ǥ
		ФեåưԤǤϥåȤƤ
		ʤ

#rodir	      -- FAT has the ATTR_RO (read-only) attribute. But on Windows,
#		 the ATTR_RO of the directory will be just ignored actually,
#		 and is used by only applications as flag. E.g. it's setted
#		 for the customized folder.
rodir	      -- FAT ˤ ATTR_RO (ɤ߽ФΤ) ȥӥ塼Ȥ¸ߤ롣
		Windows Ǥϡǥ쥯ȥФ ATTR_RO ñ
		̵뤵졢ץꥱ󤫤Τߥե饰ȤƻȤ롣
		Ūˤϥꤵ줿եФƥåȤ롣

#		 If you want to use ATTR_RO as read-only flag even for
#		 the directory, set this option.
		⤷ATTR_RO ե饰ǥ쥯ȥФƤɤ߽ФΤ
		̣ե饰ȤѤˤϡΥץ
		ꤹ롣

<bool>: 0,1,yes,no,true,false

#TODO
TODO
----------------------------------------------------------------------
#* Need to get rid of the raw scanning stuff.  Instead, always use
#  a get next directory entry approach.  The only thing left that uses
#  raw scanning is the directory renaming code.
* RAW ԤäƤʬ򲿤Ȥ뤳ȡˡּΥǥ쥯
  ȥꥨȥ׽ˤ٤ѹ롣 RAW 󤬻Ĥä
  Τϥǥ쥯ȥ͡ॳɤǤ롣


#POSSIBLE PROBLEMS
ǽΤ
----------------------------------------------------------------------
#* vfat_valid_longname does not properly checked reserved names.
#* When a volume name is the same as a directory name in the root
#  directory of the filesystem, the directory name sometimes shows
#  up as an empty file.
#* autoconv option does not work correctly.
* vfat_valid_longname ͽ̾Ŭڤ˥åƤʤ
* volume ̾ե륷ƥΥ롼ȥǥ쥯ȥˤǥ쥯ȥ̾
  Ʊ硢ǥ쥯ȥ̾Ǥ褦ɽ롣
* autoconv ץưʤ

#BUG REPORTS
Хݡ
----------------------------------------------------------------------
#If you have trouble with the VFAT filesystem, mail bug reports to
#chaffee@bmrc.cs.berkeley.edu.  Please specify the filename
#and the operation that gave you trouble.
VFAT ե륷ƥФ꤬ȯˤϡХݡȤ
chaffee@bmrc.cs.berkeley.edu äƤե̾ȡ꤬ȯ
ɬƤ

#TEST SUITE
ƥȷ
----------------------------------------------------------------------
#If you plan to make any modifications to the vfat filesystem, please
#get the test suite that comes with the vfat distribution at
vfat ե륷ƥѹä褦Ȥ硢vfat ǥȥӥ塼
źդƤƥȷƤ

  http://bmrc.berkeley.edu/people/chaffee/vfat.html

#This tests quite a few parts of the vfat filesystem and additional
#tests for new features or untested features would be appreciated.
ΥƥȤ vfat ե륷ƥΰΤߤƥȤΤǤ
ǽ䡢̤ƥȤεǽФɲäΥƥȤ礤˴ޤޤ

#NOTES ON THE STRUCTURE OF THE VFAT FILESYSTEM
VFAT ե륷ƥι¤˴ؤ
----------------------------------------------------------------------
#(This documentation was provided by Galen C. Hunt <gchunt@cs.rochester.edu>
# and lightly annotated by Gordon Chaffee).
ʸ Galen C. Hunt <gchunt@cs.rochester.edu> ˤ󶡤
ΤǡGordon Chaffee ˤɵƤޤ

#This document presents a very rough, technical overview of my
#knowledge of the extended FAT file system used in Windows NT 3.5 and
#Windows 95.  I don't guarantee that any of the following is correct,
#but it appears to be so.
ʸ˹Ӥ٥ΡΤϰϤǤ Windows NT 3.5  
Windows 95 γĥ FAT ե륷ƥˤĤƤεŪʳǤʲ
εܤȤݾڤϤɤʬФƤ⤢ޤ󤬡褦
ȹͤƤޤ

#The extended FAT file system is almost identical to the FAT
#file system used in DOS versions up to and including 6.223410239847
#:-).  The significant change has been the addition of long file names.
#These names support up to 255 characters including spaces and lower
#case characters as opposed to the traditional 8.3 short names.
ĥ FAT ե륷ƥϡDOS С 6.223410239847 :-) ޤǤ
FAT ե륷ƥȤۤȤƱǤ礭ѹϡ
ե̾ΥݡȤǤ 8.3 ûե̾Ф
̾ 255 ʸޤǤȤʤꡢ侮ʸݡȤƤޤ

#Here is the description of the traditional FAT entry in the current
#Windows 95 filesystem:
ߤ Windows 95 ե륷ƥǤν FAT ȥη򼨤
ޤ

#        struct directory { // Short 8.3 names 
#                unsigned char name[8];          // file name 
#                unsigned char ext[3];           // file extension 
#                unsigned char attr;             // attribute byte 
#		unsigned char lcase;		// Case for base and extension
#		unsigned char ctime_ms;		// Creation time, milliseconds
#		unsigned char ctime[2];		// Creation time
#		unsigned char cdate[2];		// Creation date
#		unsigned char adate[2];		// Last access date
#		unsigned char reserved[2];	// reserved values (ignored) 
#                unsigned char time[2];          // time stamp 
#                unsigned char date[2];          // date stamp 
#                unsigned char start[2];         // starting cluster number 
#                unsigned char size[4];          // size of the file 
#        };
        struct directory { // û 8.3 ե̾
                unsigned char name[8];          // ե̾ 
                unsigned char ext[3];           // ĥ
                unsigned char attr;             // ȥӥ塼ȥХ
		unsigned char lcase;		// ե̾ȳĥ
						// ʸʸζ
		unsigned char ctime_ms;		//  (ߥñ)
		unsigned char ctime[2];		// 
		unsigned char cdate[2];		// 
		unsigned char adate[2];		// ǽ
		unsigned char reserved[2];	// ͽ (̵뤵)
                unsigned char time[2];          // ॹ 
                unsigned char date[2];          // ե
                unsigned char start[2];         // ϥ饹ֹ
                unsigned char size[4];          // ե륵
        };

#The lcase field specifies if the base and/or the extension of an 8.3
#name should be capitalized.  This field does not seem to be used by
#Windows 95 but it is used by Windows NT.  The case of filenames is not
#completely compatible from Windows NT to Windows 95.  It is not completely
#compatible in the reverse direction, however.  Filenames that fit in
#the 8.3 namespace and are written on Windows NT to be lowercase will
#show up as uppercase on Windows 95.
lcase եɤϡ8.3 Υե̾Υ١/ޤϳĥҤ
ʸѴ뤫ɤꤷޤΥեɤ Windows 95 ǤϻȤ
Ƥʤ褦ǤWindows NT ǤϻȤƤޤե̾ʸ
ʸζ̤ˤϡWindows NT  Windows 95 ֤δʸߴϤޤ
ǤδʸߴƱͤˤޤ8.3 ǡWindows NT Ǿʸ
ǻꤵ줿̾ Windows 95 Ǥʸɽޤ

#Note that the "start" and "size" values are actually little
#endian integer values.  The descriptions of the fields in this
#structure are public knowledge and can be found elsewhere.
"start"  "size" ͤϼºݤˤϥȥ륨ǥͤǤ뤳Ȥα
դι¤ΤեɤϸǤꡢ¾ξ
Ǥޤ

#With the extended FAT system, Microsoft has inserted extra
#directory entries for any files with extended names.  (Any name which
#legally fits within the old 8.3 encoding scheme does not have extra
#entries.)  I call these extra entries slots.  Basically, a slot is a
#specially formatted directory entry which holds up to 13 characters of
#a file's extended name.  Think of slots as additional labeling for the
#directory entry of the file to which they correspond.  Microsoft
#prefers to refer to the 8.3 entry for a file as its alias and the
#extended slot directory entries as the file name. 
ĥ FAT ƥǤϡޥեȼҤϳĥ ե̾ĥե
ФɲäΥǥ쥯ȥꥨȥޤ (äơ 8.3 
ޤ̾ɲäΥȥޤ)Ϥ̤
ȥ򥹥åȤȸƤǤޤŪˤϡåȤüʷΥǥ
쥯ȥꥨȥǤꡢեγĥ̾Τ 13 ʸޤǤݻޤ
ΥåȤϤХեбǥ쥯ȥꥨȥɲå٥
褦ʤΤǤޥեȼҤ 8.3 Υȥ򥨥ꥢȸƤӡ
ĥåȥǥ쥯ȥե̾ȸƤ֤Ȥ򹥤ߤޤ

#The C structure for a slot directory entry follows:
åȥǥ쥯ȥꥨȥ C ¤ΤϰʲΤȤǤ

#        struct slot { // Up to 13 characters of a long name 
#                unsigned char id;               // sequence number for slot 
#                unsigned char name0_4[10];      // first 5 characters in name 
#                unsigned char attr;             // attribute byte
#                unsigned char reserved;         // always 0 
#                unsigned char alias_checksum;   // checksum for 8.3 alias 
#                unsigned char name5_10[12];     // 6 more characters in name
#                unsigned char start[2];         // starting cluster number
#                unsigned char name11_12[4];     // last 2 characters in name
#        };
        struct slot { // 󥰥ե̾ 13 ʸޤǤʬ 
                unsigned char id;               // åȤΥֹ
                unsigned char name0_4[10];      // ̾κǽ 5 ʸ
                unsigned char attr;             // ȥӥ塼ȥХ
                unsigned char reserved;         // Ĥͤ 0
                unsigned char alias_checksum;   // 8.3 ꥢ̾Υå
                unsigned char name5_10[12];     // ̾ܤʬ 6 ʸ
                unsigned char start[2];         // ϥ饹ֹ
                unsigned char name11_12[4];     // ̾κǸʸ
        };

#If the layout of the slots looks a little odd, it's only
#because of Microsoft's efforts to maintain compatibility with old
#software.  The slots must be disguised to prevent old software from
#panicking.  To this end, a number of measures are taken:
쥤Ȥ¿̯˸뤫⤷ޤ󤬡ϥޥեȼҤ
եȥȤδ֤θߴݻ褦ȤϤη̤ǤåȤ
ŤեȥӤäꤷʤ褦˵ʤФޤ󡣤Τ
ˡĤε§ѤƤޤ

#        1) The attribute byte for a slot directory entry is always set
#           to 0x0f.  This corresponds to an old directory entry with
#           attributes of "hidden", "system", "read-only", and "volume
#           label".  Most old software will ignore any directory
#           entries with the "volume label" bit set.  Real volume label
#           entries don't have the other three bits set.
        1) åȥǥ쥯ȥꥨȥΥȥӥ塼ȥХȤϾ 
	0x0f ˥åȤޤϽΥǥ쥯ȥꥨȥǤϡ"
	°"  "ƥ°"  "ɤ߽ФΤ"  ɥܥ塼
	٥ ̣ޤۤȤɤθŤեȥǤϡɥܥ
	٥ɥӥåȤåȤƤǥ쥯ȥϤ٤̵뤷
	ޤʪΥܥ塼٥Ǥϡ¾ 3 ĤΥӥåȤϥåȤ
	Ƥޤ

#        2) The starting cluster is always set to 0, an impossible
#           value for a DOS file.
        2) ϥ饹ϤĤͤ 0 ˥åȤޤ DOS ե
	ϤꤨʤͤǤ

#Because the extended FAT system is backward compatible, it is
#possible for old software to modify directory entries.  Measures must
#be taken to ensure the validity of slots.  An extended FAT system can
#verify that a slot does in fact belong to an 8.3 directory entry by
#the following:
ĥ FAT ƥ˽ߴ뤿ᡢŤեȥΥǥ
쥯ȥꥨȥѹʤФޤ󡣥åȤͭݾڤ
ˤϡ˵§ɬפǤĥ FAT ƥǤϡåȤ 8.3 ǥ
쥯ȥꥨȥ˼ºݤбƤ뤫ɤϡʲμǸڤޤ

#        1) Positioning.  Slots for a file always immediately proceed
#           their corresponding 8.3 directory entry.  In addition, each
#           slot has an id which marks its order in the extended file
#           name.  Here is a very abbreviated view of an 8.3 directory
#           entry and its corresponding long name slots for the file
#           "My Big File.Extension which is long":
        1) ֤ˤȽǡեФ륹åȤϡб 8.3 ǥ
	쥯ȥꥨȥľ֤ޤˡƥåȤˤϳĥ
	̾ν򼨤ޤʲȤƤǲ 8.3 
	ǥ쥯ȥꥨȥȴϢ󥰥ե̾åȤǡ
	̾ϡ"My Big File.Extension which is long" Ǥ

                <proceeding files...>
                <slot #3, id = 0x43, characters = "h is long">
                <slot #2, id = 0x02, characters = "xtension whic">
                <slot #1, id = 0x01, characters = "My Big File.E">
                <directory entry, name = "MYBIGFIL.EXT">

#           Note that the slots are stored from last to first.  Slots
#           are numbered from 1 to N.  The Nth slot is or'ed with 0x40
#           to mark it as the last one.
           åȤϺǸ夫ǽ˸äƳǼƤȤդ
	   åȤ 1  N ޤǤֹ椬ĤƤꡢN 
	   ܤΥåȤˤ 0x40 ¤ȤƺǸΥåȤǤ
	   뤳ȤΰȤʤäƤޤ

#        2) Checksum.  Each slot has an "alias_checksum" value.  The
#           checksum is calculated from the 8.3 name using the
#           following algorithm:
        2) åࡣƥåȤ "alias_checksum" ͤޤ
	åͤ 8.3 Υե̾ʲΥ르ꥺǺ
	ޤ

                for (sum = i = 0; i < 11; i++) {
                        sum = (((sum&1)<<7)|((sum&0xfe)>>1)) + name[i]
                }

#	3) If there is free space in the final slot, a Unicode NULL (0x0000) 
#	   is stored after the final character.  After that, all unused 
#	   characters in the final slot are set to Unicode 0xFFFF.
	3) ǸΥåȤ˶ΰ褬硢Ǹʸθ Unicode
	NULL ʸ (0x0000) ǼޤθΥåȤ̤ʸ
	Ϥ٤ Unicode 0xFFFF ޤ

#Finally, note that the extended name is stored in Unicode.  Each Unicode
#character takes two bytes.
Ǹˡγĥ̾ Unicode (UTF-16) ǳǼƤ뤳ȤդƤ
 Unicode ʸϣХȤ񤷤ޤ

