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[b-free: 1373] Re: HD¤«¤é¤Î¥Ö¡¼¥È (Re: Re^2: FD ¤Ç boot¤¹¤ëÊýË¡¤ò¶µ¤¨¤Æ¤¯¤À¤µ¤¤)




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From: Takanori Hayashi <takanori@ohsaki.meidensha.co.jp>
Subject: [b-free: 1372] Re: HD¤«¤é¤Î¥Ö¡¼¥È (Re: Re^2: FD     ¤Ç boot¤¹¤ëÊýË¡¤ò¶µ¤¨¤Æ¤¯¤À¤µ¤¤)
Date: Thu, 16 Apr 98 17:28:50 +0900

> ÎӤǤ¹¡£
> 

...[snip]...

> naitoh_r> ¤Þ¤¡¡¢º£¤Î¤È¤³¤íÌäÂê¤Ê¤Î¤Ï 2nd boot ¤Ê¤Î¤Ç fdisk ¤Ï´Ø·¸¤Ê¤¤¤Ç¤¹¡£
> naitoh_r> ¤È¤ê¤¢¤¨¤º¡¢³ÈÄ¥ CHS ¤Ç¥¢¥¯¥»¥¹¤Ç¤­¤ë¤è¤¦¤Ë¤Ê¤é¤Ê¤¤¤«¤ä¤Ã¤Æ¤ß¤Þ¤¹¡£
> 
> ¤³¤Î¾ì¹ç¡¢ÌäÂê¤ÏEIDE¥Ç¥£¥¹¥¯¤Î¥Ï¡¼¥É¥¦¥§¥¢¡¦¥¤¥ó¥¿¥Õ¥§¡¼¥¹¤Ç¤Î
> CHSÃͤòÄ´¤Ù¤ë¤³¤È¤Ç¤¹¤Í¡£ÈÆÍÑŪ¤ÊÊýË¡¤Ã¤Æ¤¢¤ê¤Þ¤·¤¿¤Ã¤±?

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(B-Free ¤À¤È boot/2nd/ide.h ¤Þ¤¿¤Ï kernel/BTRON/device/ide/ide.h ¤Ç 
ide_id ¤È¤¤¤¦¹½Â¤ÂΤÇÄêµÁ¤·¤Æ¤¤¤ë¾ðÊó¤Ç¤¹)
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FAQ ¤òÆÉ¤ó¤À¤È¤³¤í¡¢Ê¬¤«¤Ã¤¿¤³¤È¤Ï

0) BIOS ¤Ï¡¢HD ¤Î¥¸¥ª¥á¥È¥ê (geometry: CHS ¤ÎÃÍ) ¤ò¥Ï¡¼¥É¥¦¥§¥¢¤È¤Ï°ã¤Ã
   ¤¿ÃͤËÊÑ´¹¤¹¤ë¡£
1) BIOS ¤ÏÊÑ´¹¸å¤ÎÃÍ¤Ç HD ¤Ë¥Ñ¡¼¥Æ¥£¥·¥ç¥ó¾ðÊó¤ò½ñ¤­¹þ¤à¡£
   (¤Ç¤Ê¤¤¤È¡¢BIOS ¤ò»È¤Ã¤Æ HD ¤ÎÆÉ¤ß½ñ¤­¤¬¤Ç¤­¤Ê¤¤)
2) ¤â¤Á¤í¤ó¡¢¥Ï¡¼¥É¥¦¥§¥¢¤òľÀÜ¥¢¥¯¥»¥¹¤¹¤ë»þ¤Ë¤Ï BIOS ¤¬ÊÑ´¹¤·¤Æ¤¤¤Ê
   ¤¤Ãͤò»ØÄꤹ¤ëɬÍפ¬¤¢¤ë¡£

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OS ¤¬¥Ñ¡¼¥Æ¥£¥·¥ç¥ó¾ðÊó¤ò¸µ¤Ë¥Ñ¡¼¥Æ¥£¥·¥ç¥óÆâ¤Î¥Ö¥í¥Ã¥¯¥Ø¥¢¥¯¥»¥¹¤¹¤ë
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# ¤Þ¤À¡¢¤Á¤ç¤Ã¤È¼«¿®¤¬¤Ê¤¤¤Ç¤¹¤¬¡£¡£¡£


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¤Ä¤Þ¤ê¡¢

	ÊÑ´¹Á°: C/H/S = (2000/16/63)
	ÊÑ´¹¸å: C/H/S = (1000/32/63)

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¥Ø¥Ã¥É¿ô¤ò¼ÂºÝ¤ÎÃͤΠ2 Çܤˤ·¤Æ¡¢¥·¥ê¥ó¥À¿ô¤ò 1024 °Ê²¼¤Ë¤·¤Æ¤¤¤ë¤ï¤±
¤Ç¤¹¤«¤é¡¢HD ¤Ø¤Î¥¢¥¯¥»¥¹¤Ï¡¢N = 2 ¤ÈÄêµÁ¤·¤Æ¡¢

       eCyl    = (Cyl * N) + (Head / dHead); /* head DIV dHead */
       eHead   = (Head % dHead);             /* head MOD dHead */
       eSector = Sector;                     /* used as is     */

	Cyl/Head/Sector ¤Ï¡¢BIOS ¥Ù¡¼¥¹¤Ç¤Î¥¢¥¯¥»¥¹¤¹¤ë°ÌÃÖ¤ò¼¨¤·¤¿¤â¤Î¡£
	eCyl/eHead/eSector ¤Ï¡¢¥Ï¡¼¥É¥¦¥§¥¢¥Ù¡¼¥¹¤Î¥¢¥¯¥»¥¹¤¹¤ë°ÌÃÖ¤ò
	¼¨¤·¤¿¤â¤Î¡£
	dHead ¤Ï¡¢¥Ï¡¼¥É¥¦¥§¥¢¤Î¥Ø¥Ã¥É¿ô¤ò¼¨¤·¤¿¤â¤Î¡£

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ÊÑ´¹¤¹¤ë¤³¤È¤¬¤Ç¤­¤½¤¦¤Ç¤¹¡£


* ÉÕµ­
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  »ØÄê¤Ç¤­¤ë¥·¥ê¥ó¥À¤Î¿ô¤¬ 10 bits ¤·¤«¤Ê¤¤¤¿¤á¡£¥Ï¡¼¥É¥¦¥§¥¢¤¬
  1024 °Ê¾å¤Î¥·¥ê¥ó¥À¤ò¤â¤Ã¤Æ¤¤¤ë¤È¡¢¥¢¥¯¥»¥¹¤Ç¤­¤Ê¤¯¤Ê¤Ã¤Æ¤·¤Þ
  ¤¦¡£¤½¤Î¤¿¤á¡¢¥Ø¥Ã¥À¿ô(¤³¤ì¤Ï¡¢256 ¤Þ¤Ç BIOS ¤Ç»ØÄê¤Ç¤­¤ë)¤ò
  ¼ÂºÝ¤Î HD ¤ÎÃͤè¤ê¤âÂ礭¤¤Ãͤˤ·¤Æ¡¢¥·¥ê¥ó¥À¿ô¤ò 1024 °Ê²¼¤Ç
  »ØÄê¤Ç¤­¤ë¤è¤¦¤Ë¤¹¤ë¡£¤¿¤È¤¨¤Ð¡¢¥·¥ê¥ó¥À¿ô¤¬ 2000 ¤Î¾ì¹ç¤Ë¤Ï¡¢
  ¥Ø¥Ã¥À¿ô¤ò 2 Çܤˤ·¤Æ¡¢¥·¥ê¥ó¥À¿ô¤Î»ØÄê¤òºÇÂç 1000 ¤Ë¤Þ¤Ç¸º¤é¤¹¡£


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| FROM R.Night                                                         |
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|         rnaitoh@st.rim.or.jp                                         |
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