´Ê¾úÁö¸¸, ¾ÆÁÖ ¸¹ÀÌ ´Ê¾úÁö¸¸ »õÇØ º¹ ¸¹ÀÌ ¹ÞÀ¸¼¼¿ä~ m(__)m
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>±×³É ufs ¼Ò½ºÀÇ ¹®¼¸¦ Àá½Ã ¹ø¿ªÇغó׿ä..Âü°íÇϼ¼¿ä..
>------------¿øº»½ÃÀÛ----------------------------------
>Disk Layout Information for Darwin i386
>
>Disk layout information for Darwin i386 is a bit odd and difficult
>to figure out. This document will describe, to the best of my
>knowledge, what the Darwin i386 disk layout is.
>
>Darwin places it's filesystem directly inside an fdisk partition.
>The fdisk partition can be created using any old fdisk program that
>lets you specify the partition type. Darwin uses the old NeXT
>partition type of 0xA8.
>
>Directly inside the fdisk partition is the Partition Boot Record(PBR).
>The PBR is 512 bytes in length and is always expected to be there,
>regardless of OS. This is Sector 0 of the partition, and the BIOS
>always believes the sector size to be 512 bytes. So, the PBR occupies
>the entire sector 0 of the disk.
>
>Following the PBR is 6.5K of "reserved" space. This space is currently
>unallocated by Apple, but I suspect it may be used by a future
booloader.
>
>On the 7K mark, begins the Darwin "ufslabel". This ufslabel is placed
>right before the UFS filesystem and contains the name of the filesystem
>along with some miscellaneous other metadata. The structure is 1K in
>size, although it is mostly empty. The ufslabel is stored in big
endian.
>All of the filesystem data is stored in big endian mode, reflecting
>the PPC nativeness of the the OS. The name stored in the filesystem
>is the name presented from the MacOS portion (Aqua) of MacOS X.
>
>After the ufslabel, the UFS filesystem technically begins. The first
>superblock is located at the 8K mark on the partition.
>
>Here is a diagram of the layout of the first few sectors:
>
> |------------ 512 bytes --------------|
> 0 ---------------------------------------------------
> | Partition Boot Record (PBR) |
> 512 ---------------------------------------------------
> | |
> 1024 ---------------------------------------------------
> | |
> 1536 ---------------------------------------------------
> | |
> 2048 ---------------------------------------------------
> | |
> 2560 ---------------------------------------------------
> | |
> 3072 ---------------------------------------------------
> | |
> 3584 ---------------------------------------------------
> | |
> 4048 ---------------------------------------------------
> | |
> 4608 ---------------------------------------------------
> | |
> 5120 ---------------------------------------------------
> | |
> 5632 ---------------------------------------------------
> | |
> 6144 ---------------------------------------------------
> | |
> 6656 ---------------------------------------------------
> | |
> 7168 ---------------------------------------------------
> | Darwin ufslabel |
> 7680 ---------------------------------------------------
> | Darwin ufslabel |
> 8192 ---------------------------------------------------
> | UFS Superblock start |
> ---------------------------------------------------
>-----------------¿øº»³¡------------------------------
>-------------¹ø¿ª½ÃÀÛ----------------------------
>´ÙÀ© i386 µð½ºÅ© ·¹À̾ƿô Á¤º¸
>
>´ÙÀ© i386°è¿ µð½ºÅ© ·¹À̾ƿô¿¡ ´ëÇÑ ºÎºÐÀº Àͼ÷ÇÏÁö ¾ÊÀº ºÎºÐÀÌ ÀÖÀ¸¸ç, Àüü¸¦
ÆľÇÇϱâ¶õ Á¶±Ý Èûµç °úÁ¦ÀÌ´Ù. ÀÌ ¹®¼¸¦ ÅëÇؼ ´ÙÀ©ÀÇ i386°è¿ÀÇ ±âº»±¸Á¶¿¡ ´ëÇØ
ÃÖ´ëÇÑ ¼³¸íÀ» Çغ¸°Ú´Ù.
>
>´ÙÀ©±¸Á¶´Â fdisk ÆÄƼ¼Ç¿¡ Á÷Á¢ ÆÄÀϽýºÅÛÀ» ÀúÀåÇÑ´Ù. ÀÌ·¯ÇÑ fdisk ÆÄƼ¼ÇÀº
ÆÄƼ¼ÇÀ» ºÐ¸®ÇÒ¶§ »ç¿ëÇÏ´ø ¿¹ÀüÀÇ fdisk ÇÁ·Î±×·¥À» ÅëÇؼ ½±°Ô »ý¼ºÇÒ ¼ö ÀÖ´Ù. ´ÙÀ©
ÆÄÀϽýºÅÛÀº 0xA8ÀÇ NeXTÆÄƼ¼Ç ±¸Á¶¸¦ »ç¿ëÇÏ°í ÀÖ´Ù.
>
>ÆÄƼ¼Ç ºÎÆ® ÀúÀå(PBR)Àº fdisk ÆÄƼ¼ÇÀÇ ³»ºÎ¿¡ Á¸ÀçÇϸç, 512¹ÙÀÌÆ®ÀÇ ±æÀ̸ç, ¾î¶°ÇÑ
OS¿¡ »ó°ü¾øÀÌ ´Ã fdisk³»ºÎ¿¡ Á¸ÀçÇϵµ·Ï ¼³°èµÇ¾î Á³´Ù. ÀÌ ºÎºÐÀº ¼½ÅÍÀÇ 0¹øÀ»
¸»Çϸç, BIOS´Â ´Ã 512¹ÙÀÌÆ®ÀÓÀ» ÀνÄÇÑ´Ù. µû¶ó¼, PBRÀº ÇÑ µð½ºÅ©ÀÇ Àüü 0¹ø ¼½Å͸¦
Â÷ÁöÇÏ´Â ¼ÀÀÌ´Ù.
>
>´ÙÀ½Àº PBRÀÇ ÀÌ¹Ì ¿¹¾àµÈ 6.5ų·Î ¹ÙÀÌÆ®ÀÇ °ø°£À» ³ªÅ¸³»ÁÖ°í ÀÖ´Ù. ÇöÀç
¿¡ÇÃÄÄÇ»ÅÍ¿¡¼´Â ÀÌ °ø°£ºÎºÐÀ» ÇÒ´çÇÏ°í ÀÖÁö ¾ÊÁö¸¸, Á¶¸¸°£ Â÷±â ºÎÆ®·Î´õ¿¡¼´Â
Áö¿øµÇ¸®¶ó º»´Ù.
>
>7ų·Î¹ÙÀÌÆ® ºÎºÐ¿¡¼ ´ÙÀ©ÀÇ "ufslabel"(ufsÇ¥½Ã)ÀÌ
½ÃÀÛÇϸç, ÀÌ ufslabel¿µ¿ªÀº UFSÆÄÀϽýºÅÛ ¹Ù·Î ÀÌÀü¿¡ Á¸ÀçÇϸç, ´Ù¸¥ ÀϺÎ
¸ÞŸµ¥ÀÌÅÍ¿Í ÇÔ²² ÆÄÀϽýºÅÛÀÇ À̸§À» ´ã°í ÀÖ´Ù. ±× ±¸Á¶´Â ºñ·Ï ÅÖ ºó °ø°£ÀÌÁö¸¸,
1ų·Î¹ÙÀÌÆ® Å©±âÀÌ´Ù. ufslabelÀº big endian ÇüÅ·ΠÀúÀåµÇ¸ç(¿ªÀÚÁÖ:À½ º¸Åë
¾ÖÇÃÄÄÇ»ÅÍ°¡ ±×·¸ÁÒ. ¸Þ¸ð¸® ¾îµå·¹½Ì¹æ¹ýÀε¥... ÇÏÁö¸¸, ¹Ì·¡¿£ µÎ°¡Áö ¸ðµÎ Áö¿øµÇ´Â
MIPS°è¿ÀÌ µµ·¡ÇÏ°ÚÁÒ..ÂÁ..Áö±ÝÀ̾ß
´ÑÅÙµµ°¡ À¯ÀÏÇÑ ½Ã½ºÅÛÀÌÁö¸¸.. À©µµ¿ì°è¿Àº ¹Ý´ë·Î little endian °è¿À̱¸¿ä..),
ÆÄÀϽýºÅÛÀÇ ¸ðµç ÀÚ·áµéÀº PPC °è¿ OSÀÇ ±âº»ÇüÅÂÀÎ big endian ¸ðµå·Î ÀúÀåÀÌ µÈ´Ù.
ÆÄÀÏ ½Ã½ºÅÛ¿¡ ÀúÀåµÈ À̸§Àº MacOs X(Àϸí "¾ÆÄí¾Æ")¶ó´Â À̸§À¸·Î ÇöÀç Ãâ½ÃµÇ¾î
ÀÖ´Ù.
>
>ufslabel´ÙÀ½À¸·Î´Â UFSÆÄÀϽýºÅÛÀÌ ½ÃÀ۵ȴÙ. ÃÖÃÊ ½´ÆÛºí·°Àº ÆÄƼ¼Ç¿¡¼
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><±×¸²>
>-------------¹ø¿ª³¡----------------
>±âº»ÀûÀÎ À¯´Ð½º ÆÄÀϽýºÅÛÀÌÁÒ..
>Solaris´Â UFS, HP-UX´Â HFS, IRIX 5.3 ±×¸®°í ÀÌÀü ¹öÀüÀº EFS,
>IRIX 6.2°¡ XFS, ±×¸®°í Linux°¡ EXT2 ¶Ç´Â EXT3.
>
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>========================================
>
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