在linux系统中的fstab文件，包含了电脑上的存储设备及其文件系统的信息。
它是决定一个硬盘（分区）被怎样使用或者说整合到整个系统中的唯一文件。
文件路径：/etc/fstab
fstab文件示例
# <file system> <dir> <type> <options> <dump> <pass>
none /dev/pts devpts defaults 0 0
none /dev/shm tmpfs defaults 0 0
/dev/dvd /media/dvd udf ro,user,noauto,unhide 0 0
/dev/hda1 swap swap defaults 0 0
/dev/hda4 / ext3 defaults 0 1
/dev/hda3 /home xfs rw,suid,exec,auto,nouser,async 0 2
UUID=03ec5dd3-45c0-4f95-a363-61ff321a09ff /www ext4 defaults,noatime 0 2
fstab文件详解
<file system> <dir> <type> <options> <dump> <pass>
<file systems>选项
指设备（硬盘及其分区，DVD光驱等）
<dir>选项
设备挂载目录。
<type>选项
指挂载设备或分区为何种文件系统类型（例如：ext2, ext3, reiserfs, xfs, jfs, smbfs, iso9660, vfat, ntfs, swap等）。
<options>选项
这部分是最有用的设置，它能使所挂载的设备在开机时自动加载、使中文显示不出现乱码、限制对挂载分区读写权限等。
选项说明：
auto - File system will
mount automatically at boot, or when the command 'mount -a' is issued.
noauto - The filesystem is mounted only when you tell it to.
exec - Allow the execution binaries that are on that partition (default).
noexec - Do not allow binaries to be executed on the filesystem.
ro - Mount the filesystem read only
rw - Mount the filesystem read-write
sync - I/O should be done synchronously
async - I/O should be done asynchronously
flush - specific option for FAT to flush data more often, thus making copy dialogs or progress bars to stays up until things are on the disk
user - Permit any user to mount the filesystem (implies noexec,nosuid,nodev unless overridden.)
nouser - Only allow root to mount the filesystem. (default)
defaults - Default mount settings (equivalent to rw,suid,dev,exec,auto,nouser,async).
suid - Allow the operation of suid, and sgid bits. They are mostly u
sed to allow users on a computer system to execute binary executables with temporarily elevated privileges in order to perform a specific task.
nosuid - Block the operation of suid, and sgid bits.
noatime - Do not update inode access times on the filesystem. Can help perf
