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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN">
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 <TITLE>Large Disk HOWTO: Linux ¤Î IDE 8 GiB ¤ÎÊÉ</TITLE>
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<HR>
<H2><A NAME="s11">11. Linux ¤Î IDE 8 GiB ¤ÎÊÉ</A></H2>

<P>Linux ¤Î IDE ¥É¥é¥¤¥Ð¤Ï ATA IDENTIFY DEVICE ¥ê¥¯¥¨¥¹¥È¤ò»ÈÍѤ¹¤ë¤³¤È¤Ë¤è¤ê¡¢
¥Ç¥£¥¹¥¯¤Î¥¸¥ª¥á¥È¥ê¤ÈÍÆÎÌ(¤È¤½¤Î¾¿¤¯¤Î¾ðÊó)¤òÆÀ¤Þ¤¹¡£
ºÇ¶á¤Þ¤Ç¡¢C*H*S ¤Ë¤è¤ê·×»»¤µ¤ì¤¿ÍÆÎ̤è¤ê¤â 10% °Ê¾åÂ礭¤¤¾ì¹ç¤Ï¡¢
¥É¥é¥¤¥Ð¤ÏÊÖ¤µ¤ì¤¿ lba_capacity ¤ÎÃͤò¿®ÍѤ·¤Þ¤»¤ó¤Ç¤·¤¿¡£
¤·¤«¤·¡¢¶È³¦¤Îµ¬Äê¤Ë¤è¤ê (16514064 ¥»¥¯¥¿¤ò±Û¤¨¤ë) Â礭¤Ê IDE ¥Ç¥£¥¹¥¯¤Ï¡¢
¼ÂºÝ¤Î¥µ¥¤¥º¤È¤Ï̵´Ø·¸¤Î¡¢
·× 16514064 ¥»¥¯¥¿ (7.8 GB (ÌõÃí: 7.8 GiB ¤Þ¤¿¤Ï 8.4 GB ¤¬Àµ¤·¤¤))
¤È¤Ê¤ë C=16383, H=16, S=63 ¤òÊÖ¤·¡¢¼ÂºÝ¤Î¥µ¥¤¥º¤Ï lba_capacity ¤ÇÊÖ¤·¤Þ¤¹¡£
<P>ºÇ¶á¤Î Linux ¥«¡¼¥Í¥ë (2.0.34 ¤ä 2.1.90) ¤Ï¤³¤Î¤³¤È¤òÃΤäƤ¤¤Æ
Àµ¤·¤¤Æ°ºî¤ò¤·¤Þ¤¹¡£
¤â¤·¸Å¤¤ Linux ¥«¡¼¥Í¥ë¤ò»È¤Ã¤Æ¤¤¤Æ¥¢¥Ã¥×¥°¥ì¡¼¥É¤â¤·¤¿¤¯¤Ê¤¯¡¢
¤½¤Î·ë²Ì 8 GiB ¤ò±Û¤¨¤ëÂçÍÆÎ̥ǥ£¥¹¥¯¤Î 8 GiB ¤·¤«°·¤¨¤Ê¤¤¤è¤¦¤Ê¤é¤Ð¡¢
/usr/src/linux/drivers/block/ide.c Æâ¤Î¥ë¡¼¥Á¥ó
lba_capacity_is_ok ¤ò°Ê²¼¤Î¤è¤¦¤ËÊѹ¹¤·¤Æ¤¯¤À¤µ¤¤¡£
(ÌõÃí: ¤Ç¤âÆÃÊ̤ÊÍýͳ¤¬¤Ê¤¤¸Â¤ê¡¢
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ÁÇľ¤Ë¥¢¥Ã¥×¥°¥ì¡¼¥É¤·¤¿Êý¤¬¤¤¤¤¤È»×¤¤¤Þ¤¹)
<BLOCKQUOTE><CODE>
<PRE>
static int lba_capacity_is_ok (struct hd_driveid *id) {
        id->cyls = id->lba_capacity / (id->heads * id->sectors);
        return 1;
}
</PRE>
</CODE></BLOCKQUOTE>

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<H2><A NAME="ss11.1">11.1 BIOS ¤ÎÊ£»¨²½</A>
</H2>

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C=16383, H=16, S=63 ¤òÊÖ¤·¡¢¼ÂºÝ¤Î¥µ¥¤¥º¤Ï LBAcapacity ¤ÎÃͤÇÊÖ¤·¤Þ¤¹¡£
¤¤¤¯¤Ä¤«¤Î BIOS ¤Ï¤³¤ì¤òÍý²ò¤»¤º¡¢
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BIOS ¤Ë¤è¤Ã¤ÆÊÑ´¹¤µ¤ì¤Æ¤·¤Þ¤Ã¤¿¥¸¥ª¥á¥È¥ê¤â¸«Ê¬¤±¤Ê¤±¤ì¤Ð¤Ê¤ê¤Þ¤»¤ó¡£
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BIOS ¤ËÌ䤤¹ç¤ï¤»¤Æ H ¤È S ¤òÆÀ¡¢C = capacity/(H*S) ¤È·×»»¤¹¤ë¤³¤È¤Ë¤è¤Ã¤Æ)¡£
Ä̾盧¤ÎÌäÂê¤Ï¡¢BIOS ÀßÄê¤Ç¥Ç¥£¥¹¥¯¤ò Normal ¤ÈÀßÄꤹ¤ë¤³¤È¤Ç²ò·è¤·¤Þ¤¹
(¤¢¤ë¤¤¤Ï¡¢¤è¤ê¤è¤¤ÊýË¡¤Ï¡¢None ¤ÈÀßÄꤷ¤Æ BIOS ¤Ë°ìÀÚǧ¼±¤µ¤»¤Ê¤¤)¡£
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DOS/Windows ¤Ç¤â»È¤¦¤Ê¤É¤ÎÍýͳ¤Ç¤³¤ì¤¬ÉÔ²Äǽ¤Ç¡¢
¤µ¤é¤Ë¥«¡¼¥Í¥ë¤ò 2.2.2 ¤«¤½¤ì°Ê¹ß¤Ë¥¢¥Ã¥×¥°¥ì¡¼¥É¤¹¤ë¤È¤¤¤¦ÁªÂò¤â̵Íý¤Ê¤é¤Ð¡¢
¥«¡¼¥Í¥ë¤Îµ¯Æ°¥Ñ¥é¥á¡¼¥¿¤ò»È¤Ã¤Æ¤¯¤À¤µ¤¤¡£
<P>BIOS ¤¬ 16320/16/63 ¤ÈÊó¹ð¤¹¤ë¾ì¹ç¤Ï¡¢
¤½¤ì¤ÏÊÑ´¹¸å¤Ë 1024/255/63 ¤òÆÀ¤ëÌÜŪ¤ÇÊó¹ð¤µ¤ì¤Æ¤¤¤ë¤Î¤Ç¤¹¡£
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<H2><A NAME="ss11.2">11.2 ¥Ø¥Ã¥É¿ô¤ò·è¤á¤ë¤¿¤á¤Î¥¸¥ã¥ó¥Ñ</A>
</H2>

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15 ¥Ø¥Ã¥É¤ÎÊý¤¬Áí¥»¥¯¥¿¿ô¤¬¾¯¤Ê¤¤»þ¤â¤¢¤ê¤Þ¤¹¡£
¤³¤ó¤Ê¥»¥Ã¥È¥¢¥Ã¥×¤ÎºÝ¤Ë¤Ï¤è¤¤Íýͳ¤¬¤¢¤ë¤«¤â¤·¤ì¤Þ¤»¤ó:
Petri Kaukasoina ¤Ï¤³¤¦¤¤¤Ã¤Æ¤Þ¤¹:
¡Ö10.1 GB ¤Î IBM Deskstar 16 GP (model IBM-DTTA-351010)
¤Ï¥Ç¥Õ¥©¥ë¥È¤Ç¤Ï 16 ¥Ø¥Ã¥É¤Ë¥¸¥ã¥ó¥Ñ¤¬ÀßÄꤵ¤ì¤Æ¤¤¤ë¤¬¡¢
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15 ¥Ø¥Ã¥É¤ÎÊý¤Ë¥¸¥ã¥ó¥Ñ¤òÀßÄꤹ¤ëɬÍפ¬¤¢¤Ã¤¿¡£
hdparm -i ¤Ï RawCHS=16383/15/63 ¤Ç LBAsects=19807200 ¤ÈÊó¹ð¤·¤Æ¤¤¤ë¡£
»ä¤Ï¤¹¤Ù¤Æ¤ÎÍÆÎ̤òÆÀ¤ë¤¿¤á¤Ë 20960/15/63 ¤Ç»È¤Ã¤Æ¤¤¤ë¡£¡×
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<A HREF="http://www.storage.ibm.com/techsup/hddtech/hddtech.htm">http://www.storage.ibm.com/techsup/hddtech/hddtech.htm</A>.
<P>
<H2><A NAME="ss11.3">11.3 ÁíÍÆÎ̤ò±£¤¹¤¿¤á¤Î¥¸¥ã¥ó¥Ñ</A>
</H2>

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<P>
<A NAME="jumperbig"></A> 
¤â¤Ã¤È¤âºÇ¶á¤ÎÀ©¸Â¤Ï 
<A HREF="Large-Disk-HOWTO-12.html#verylarge">33.8 GB ¤ÎÊÉ</A> ¤Ç¤¹¡£
2.3.21 ¤è¤ê¸Å¤¤ Linux ¥«¡¼¥Í¥ë¤Ç¤Ï¡¢
¤³¤ì¤è¤êÍÆÎ̤ÎÂ礭¤Ê IDE ¥Ç¥£¥¹¥¯¤ò¤¦¤Þ¤¯½èÍý¤¹¤ë¤Ë¤Ï¥Ñ¥Ã¥Á¤¬É¬ÍפǤ¹¡£
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33.8GB ¥Ç¥£¥¹¥¯¤Ë¸«¤»¤«¤±¤ë¤¿¤á¤Î¥¸¥ã¥ó¥ÑÀßÄ꤬²Äǽ¤Ê¤â¤Î¤¬¤¢¤ê¤Þ¤¹¡£
Î㤨¤Ð¡¢IBM Deskstar 37.5 GB disk (DPTA-353750)
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33.8 GB ¤Î¥Ç¥£¥¹¥¯¤Ë¸«¤»¤«¤±¤ë¤¿¤á¤Î¥¸¥ã¥ó¥ÑÀßÄ꤬²Äǽ¤Ç¡¢
(ÌõÃí: 2.1 GB ¤Ë¸«¤»¤«¤±¤ë¤³¤È¤Î¤Ç¤­¤ë)
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LBAcapacity ¤Ï (ÌõÃí: 33.8GB ¤ËÁêÅö¤¹¤ë) 66055248 ¤ÈÊó¹ð¤·¤Þ¤¹
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Linux ¤Î²¼¤Ç¤¹¤Ù¤Æ¤ÎÍÆÎ̤òÍøÍѤ¹¤ë¤¿¤á¤Ë¥Ö¡¼¥È¥Ñ¥é¥á¡¼¥¿¤òɬÍפȤ·¤Þ¤¹¡£
<A HREF="http://www.storage.ibm.com/techsup/hddtech/bios338gb.htm">the BIOS 33.8 GB limit</A>
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