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<H2><A NAME="s4">4. ¥Ç¥£¥¹¥¯¥¢¥¯¥»¥¹</A></H2>

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<H2><A NAME="ss4.1">4.1 BIOS ¤Ë¤è¤ë¥Ç¥£¥¹¥¯¥¢¥¯¥»¥¹¤È 1024 ¥·¥ê¥ó¥ÀÀ©¸Â</A>
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<P>Linux ¤Ï BIOS ¤ò»È¤Ã¤Æ¤¤¤Þ¤»¤ó¤¬¡¢¤¤¤¯¤Ä¤«¤Î¾¤Î¥·¥¹¥Æ¥à¤Ï»È¤Ã¤Æ¤¤¤Þ¤¹¡£
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1024 ¥·¥ê¥ó¥À¤è¤ê¾å¤Ï BIOS ¤Ç¤Ïɽ¸½¤Ç¤­¤Ê¤¤¤È¤¤¤¦¤³¤È¤Ë¤Ê¤ê¤Þ¤¹¡£
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LBA ¤ò¥µ¥Ý¡¼¥È¤·¤¿ IDE ¥Ç¥£¥¹¥¯¤¬Æ³Æþ¤µ¤ì¤¿»þ¤Ë¤âÊѹ¹¤µ¤ì¤Þ¤»¤ó¤Ç¤·¤¿¤Î¤Ç¡¢
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Linux ¤â¥¸¥ª¥á¥È¥ê¤òɬÍפȤ¹¤ë¤³¤È¤ò°ÕÌ£¤·¤Þ¤¹¡£
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<H2><A NAME="ss4.2">4.2 BIOS ¤È IDE ¤Î¡ÖÊÉ¡×(¾å¸Â)¤ÎÎò»Ë</A>
</H2>

<P>
<DL>
<DT><B>ATA »ÅÍͽñ (IDE ¥Ç¥£¥¹¥¯ÍÑ) - 137 GB ¤Þ¤Ç</B><DD><P>65536 ¥·¥ê¥ó¥À (0-65535 ¤ÎÈÏ°Ï)¡¢16 ¥Ø¥Ã¥É (0-15 ¤ÎÈÏ°Ï)¡¢
255 ¥»¥¯¥¿Ëè¥È¥é¥Ã¥¯ (1-255 ¤ÎÈÏ°Ï) ¤Þ¤Ç°·¤¨¤Þ¤¹¡£
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136902082560 ¥Ð¥¤¥È (137 GB) ¤Ë¤Ê¤ê¤Þ¤¹¡£
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<DT><B>BIOS Int 13 - 8.5 GB ¤Þ¤Ç</B><DD><P>1024 ¥·¥ê¥ó¥À (0-1023 ¤ÎÈÏ°Ï), 256 ¥Ø¥Ã¥É (0-255 ¤ÎÈÏ°Ï),
63 ¥»¥¯¥¿Ëè¥È¥é¥Ã¥¯ (1-63 ¤ÎÈÏ°Ï) ¤Þ¤Ç°·¤¨¤Þ¤¹¡£
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DOS ¤Ç¤Ïº£Æü¤ÎÂçÍÆÎ̥ǥ£¥¹¥¯¤¬»È¤¨¤Ê¤¤¤³¤È¤ò°ÕÌ£¤·¤Æ¤¤¤Þ¤¹¡£
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<DT><B>528 MB ¤ÎÊÉ</B><DD><P>BIOS Int 13 ¥³¡¼¥ë¤È IDE ¥Ç¥£¥¹¥¯ I/O ¤ÎξÊý¤ËƱ¤¸ c,h,s ¤ÎÃͤò»È¤Ã¤¿¾ì¹ç¡¢
ξÊý¤ÎÀ©¸Â¤¬ÁȤ߹ç¤ï¤µ¤ì¡¢
1024 ¥·¥ê¥ó¥À¡¦16 ¥Ø¥Ã¥É¡¦63 ¥»¥¯¥¿Ëè¥È¥é¥Ã¥¯¤Þ¤Ç¤·¤«»ÈÍѤǤ­¤º¡¢
ºÇÂçÍÆÎÌ¤Ï 528482304 ¥Ð¥¤¥È (528MB) ¤È¤Ê¤ê¤Þ¤¹¡£
¤³¤ì¤¬ DOS ¤È¸Å¤¤ BIOS ¤ÎÁȤ߹ç¤ï¤»¤Ë¤è¤ë°­Ì¾¹â¤¤ 504MiB ¤ÎÊɤǤ¹¡£
¤³¤ì¤Ï 1993ǯ¤´¤í¤ËÌäÂê¤È¤Ê¤ê¡¢¿Í¡¹¤Ï¤¹¤Ù¤Æ¤Î¼ïÎà¤Î¤Ú¤Æ¤ó¤ËÁʤ¨¤Þ¤·¤¿¡£
¤¹¤Ê¤ï¤Á¥Ï¡¼¥É¥¦¥§¥¢(LBA)¡¢¥Õ¥¡¡¼¥à¥¦¥§¥¢(BIOS¤Ë¤è¤ëÊÑ´¹)¡¢
¤½¤·¤Æ¥½¥Õ¥È¥¦¥§¥¢(¥Ç¥£¥¹¥¯¥Þ¥Í¡¼¥¸¥ã)¤Ç¤¹¡£
¡ÖÊÑ´¹¡×¤Î³µÇ°¤Ï 1994ǯ¤Ë¤Ç¤Ã¤Á¤¢¤²¤é¤ì¤Þ¤·¤¿:
BIOS ¤Ï¡¢¥É¥é¥¤¥Ö¤È²ñÏ乤ë»þ¤Î¥¸¥ª¥á¥È¥ê¤È¡¢¤½¤ì¤È¤Ï°Û¤Ê¤ë¡¢µ¶¤Î¡¢
DOS ¤È²ñÏ乤ë»þ¤Î¥¸¥ª¥á¥È¥ê¤ò»È¤¤¡¢¤½¤·¤Æ¤½¤Î 2¤Ä¤Î´Ö¤ÇÊÑ´¹¤ò¹Ô¤¤¤Þ¤¹¡£
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<DT><B>2.1GB ¤ÎÊÉ (1996ǯ 4·î)</B><DD><P>¤¤¤¯¤Ä¤«¤Î¸Å¤¤ BIOS ¤Ç¤Ï¡¢¥·¥ê¥ó¥À¿ô¤ò³ÊǼ¤¹¤ë¤¿¤á¤Î CMOS RAM Æâ¤Î
¥Õ¥£¡¼¥ë¥É¤ò 12 ¥Ó¥Ã¥Èʬ¤·¤«³ÎÊݤ·¤Æ¤¤¤Þ¤»¤ó¡£
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<A HREF="http://www.firmware.com/support/bios/over2gb.htm">over2gb.htm</A>
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<A HREF="http://www.asus.com/Products/Techref/Ide/Intel/intel-ide-001.html">¤½¤Î¾¤Î BIOS</A>
¤Ï¥Ï¥ó¥°¤Ï¤·¤Þ¤»¤ó¤¬¡¢2.5 GB ¤ÎÂå¤ï¤ê¤Ë 429 MB ¤È¤¤¤Ã¤¿¤è¤¦¤Ë
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¥Ç¥£¥¹¥¯¤ÎÁíÍÆÎ̤Ȥ·¤Æ¸¡½Ð¤µ¤ì¤Æ¤¤¤ë¤ï¤±¤Ç¤¹)
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<DT><B>3.2 GB ¤ÎÊÉ</B><DD><P>¤³¤ì¤Ï Phoenix BIOS ¥Õ¥¡¡¼¥à¥¦¥§¥¢¤Î 4.03 ¤È 4.04 ¤Î¥Ð¥°¤Ç¡¢
3277 MB ¤ò±Û¤¨¤ëÍÆÎ̤Υɥ饤¥Ö¤ò·Ò¤¤¤Ç CMOS ¥»¥Ã¥È¥¢¥Ã¥×¤ò¹Ô¤¦¤È
¥·¥¹¥Æ¥à¤¬¥í¥Ã¥¯¤·¤Æ¤·¤Þ¤¤¤Þ¤¹¡£
<A HREF="http://www.firmware.com/support/bios/over3gb.htm">over3gb.htm</A> ¤ò»²¾È¤·¤Æ¤¯¤À¤µ¤¤¡£
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<DT><B>4.2 GB ¤ÎÊÉ (1997ǯ 2·î)</B><DD><P>ñ½ã¤Ê BIOS ÊÑ´¹ (ECHS=³ÈÄ¥(Extended)CHS¡¢
¤·¤Ð¤·¤Ð `Large disk support' ¤ä¤¢¤ë¤¤¤Ïñ¤Ë `Large' ¤È¸Æ¤Ð¤ì¤Þ¤¹)¤Ï¡¢
¥Ø¥Ã¥É¿ô¤ò 2Çܤ·¥·¥ê¥ó¥À¿ô¤òȾʬ¤Ë¤¹¤ë¤È¤¤¤¦Æ°ºî¤ò¡¢
DOS ¤«¤é¸«¤¨¤ë¥·¥ê¥ó¥À¿ô¤¬ 1024 °Ê²¼¤Ë¤Ê¤ë¤Þ¤Ç·«¤êÊÖ¤·¤Þ¤¹¡£
¸½ºß DOS ¤È Windows 95 ¤Ï 256 ¥Ø¥Ã¥À¤ò°·¤¨¤Þ¤»¤ó¤·¡¢
°ìÈÌŪ¤Ë¥Ç¥£¥¹¥¯¤Ï 16 ¥Ø¥Ã¥É¤Ç¤¢¤ë¤ÈÅú¤¨¤ë¤Î¤Ç¡¢
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¥Ð¥¤¥È(µ¶¤Î¥¸¥ª¥á¥È¥ê¤Ï 1024 ¥·¥ê¥ó¥À¡¦128 ¥Ø¥Ã¥É¡¦63 ¥»¥¯¥¿/¥È¥é¥Ã¥¯)
¤Þ¤Ç¤·¤«Æ°ºî¤·¤Ê¤¤¤³¤È¤ò°ÕÌ£¤·¤Þ¤¹¡£
ECHS ¤Ï¥»¥¯¥¿Ëè¥È¥é¥Ã¥¯¤Î¿ô¤ÏÊѹ¹¤·¤Ê¤¤¤³¤È¤ËÃí°Õ¤·¤Æ¤¯¤À¤µ¤¤¡£
¤½¤·¤Æ¤³¤ì¤¬ 63 ¤Ç¤Ï¤Ê¤¤¾ì¹ç¤ÏÀ©¸Â¤Ï¤â¤Ã¤È¤­¤Ä¤¯¤Ê¤ê¤Þ¤¹¡£
<A HREF="http://www.firmware.com/support/bios/over4gb.htm">over4gb.htm</A> ¤ò»²¾È¤·¤Æ¤¯¤À¤µ¤¤¡£
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<DT><B>7.9 GB ¤ÎÊÉ</B><DD><P>ºÇ½é¤Ë¥Ø¥Ã¥É¿ô¤ò 15 ¤ËÄ´À°¤¹¤ë¤³¤È¤Ç¾åµ­¤Î¤è¤¦¤ÊÌäÂê
(ECHS ¤òÉü½¬¤·¤Æ¤¯¤À¤µ¤¤)¤òÈò¤±¤ë¤³¤È¤Î¤Ç¤­¤ë¾¯¤·¸­¤¤ BIOS ¤Ï¡¢
¤½¤ì¤Ë¤è¤Ã¤Æ 240 ¥Ø¥Ã¥É¤Þ¤Ç¤Îµ¶¤Î¥¸¥ª¥á¥È¥ê¤òÆÀ¤ë¤³¤È¤¬¤Ç¤­¤ë¤Î¤Ç¡¢
1024*240*63*512=7927234560 ¥Ð¥¤¥È¤Þ¤ÇÍ­¸ú¤È¤Ê¤ê¤Þ¤¹¡£
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<DT><B>8.4 GB ¤ÎÊÉ</B><DD><P>
<A NAME="The 8.4 GB limit"></A> 
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255 ¥Ø¥Ã¥É¤È 63 ¥»¥¯¥¿Ëè¥È¥é¥Ã¥¯¤ò»È¤¦¤È
(`assisted LBA' ¤¢¤ë¤¤¤Ïñ¤Ë `LBA' ¤È¸Æ¤Ð¤ì¤ë)¡¢
1024*255*63*512=8422686720 ¥Ð¥¤¥È¤Þ¤ÇÅþã¤Ç¤­¤Þ¤¹¡£
8.5GB À©¸Â¤Î¤Á¤ç¤Ã¤È¼êÁ°¤Ç¤¹¤¬¡¢
¤³¤ì¤Ï 256 ¥Ø¥Ã¥À¤Î¥¸¥ª¥á¥È¥ê¤òÈò¤±¤Ê¤±¤ì¤Ð¤Ê¤é¤Ê¤¤¤«¤é¤Ç¤¹¡£
(¤³¤ÎÊÑ´¹¤Ï¤Þ¤º¡¢¥Ç¥£¥¹¥¯ÍÆÎ̤¬ 1024*H*63*512
¤Ë¼ý¤Þ¤ë¤è¤¦¤Ë¥Ø¥Ã¥É¿ô H ¤ò 16, 32, 64,128, 255 ¤«¤éÁª¤Ó¡¢
¼¡¤ËÁíÍÆÎ̤ò (H*63*512) ¤Ç³ä¤Ã¤Æ¥·¥ê¥ó¥À¿ô C ¤ò·×»»¤·¤Þ¤¹¡£)
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<DT><B>33.8 GB ¤ÎÊÉ (1999ǯ 8·î)</B><DD><P>
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