版权所有 不得复制 文档标题（要修改） 2002/1/14
支持磁盘配额 不支持磁盘配额 不支持磁盘配额
支持文件压缩（系统） 不支持文件压缩（系统
不支持文件压缩（系统
支持 EFS 文件加密系统 不支持 EFS 不支持 EFS
产生的磁盘碎片较少 产生的磁盘碎片适中 产生的磁盘碎片较多
适合于大磁盘分区 适合于中小磁盘分区
适合于小与 2G 的磁盘分
区
WindowsNT 系统支持 9x
系统不支持
NT4.0 不 支 持 ，
2000 ， xp,98 ， me 都 支
持
NT,9x 系统都支持
A
文件分配表（
FAT
）
is a table that an operating system maintains on a hard disk that provides a map of the
clusters (the basic units of logical storage on a hard disk) that a file has been stored in. When you write a new file
to a hard disk, the file is stored in one or more clusters that are not necessarily next to each other; they may be
rather widely scattered over the disk. A typical cluster size is 2,048 bytes, 4,096 bytes, or 8,192 bytes. The
operating system creates a FAT entry for the new file that records where each cluster is located and their
sequential order. When you read a file, the operating system reassembles the file from clusters and places it as an
entire file where you want to read it. For example, if this is a long Web page, it may very well be stored on more
than one cluster on your hard disk.
FAT32 Structure Information - Written by Jack Dobiash
Updated : April 14th, 1999
A lot of the number references I've made in this document are in Hexadecimal.
Any that are have an 'h' after them. Also, just in case my terminology may be
different from yours; a 'WORD' is 2 Bytes and a 'DOUBLE WORD' is 4 Bytes.
主引导记录
The 主引导记录 is the same for pretty much all 操作系统. It is
located on 第一个扇区 of the Hard Drive, at Cylinder 0, Head 0,
Sector 1. It is the first piece of code that your computer runs
after it has checked all of your hardware (POST) and turned control
of loading software over the hard drive. It also contains the 分区
表, which defines the different sections of your hard drive.
Basically if anything happens to this little 512 byte section, your
hard drive is brain dead. Kinda scary, eh? :)
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2009-12-16
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