Mount is a command under Linux. It can connect a partition to a folder in Linux, thus associating the partition with the directory. Therefore, if we access this folder, it is equivalent to accessing the partition. Currently mount is not limited to Linux. Applications under Windows are also becoming more and more widely used in virtual CD-ROM software such as Clone CD, Daemon tool, WinMount, etc.
Mount formatThe following formats can be mounted to a virtual disk.
1. CD image ISO/IMG/VCD/nrg/mdf and mds/FCD/LCD/bin, etc.
Support software: Alcohol, Clone, Daemon, UtraISO, WinISO, Virtual disk, WinMount
2. Audio image FLAC/APE/WV/WAVE
Support software: WinMount
3. Virtual machine hard disk image VHD/VMDK/VDI
Support software: Virtual disk, VMware, Virtual box, WinMount
4. Compression format RAR/ZIP/MOU
Support software: WinMount
The role of mountBefore a user opens a file on a UNIX machine, the file system containing the file must be mounted first. At this time, the user must mount the file system to mount the file. Usually used on USB or other removable storage devices, and the root directory remains mounted. But the Unix file system can correspond to a file and not necessarily a hardware device.
The mount command of the Unix command line tells the operating system that the corresponding file system is ready to be used, and the file system will correspond to a specific point (called a mount point). Mounted files, directories, devices, and special files are available to users. In addition to the mount command invoked by the operating system, mount_root() will be mounted first (or the root directory). In this case, the operating system will call mount before calling setup.
Its corresponding command, umount, tells the operating system to disconnect the file system from the mount point.
File system entry http://en.wikipedia.org/wiki/%E6%AA%94%E6%A1%88%E7%B3%BB%E7%B5%B1
The computer's file system is a way to store and organize computer data, making it easy to access and find. The file system uses the abstract logical concept of files and tree directories instead of physical devices such as hard disks and optical disks. The concept that the user uses the file system to save data does not have to care about the data block whose data is actually stored on the hard disk (or CD). Just remember the directory and file name of the file. Before writing new data, the user does not have to care that the block address on the hard disk is not being used. The storage space management (allocation and release) function on the hard disk is automatically completed by the file system, and the user only needs to remember which file the data is written to. in.
File systems typically use storage devices such as hard disks and optical disks and maintain the physical location of files in the device. However, in fact, the file system may be just an interface for accessing data. The actual data is provided by network protocols (such as NFS, SMB, 9P, etc.) or in memory, or even no corresponding files at all. Proc file system).
Strictly speaking, the file system is a set of abstract data types that implement operations such as storage, hierarchical organization, access, and retrieval of data.
Then here, the role of mount is to remount the file system to the mount point /system with a specific option (rw).
The purpose is only to have permission to read and write files under /system, why not chmod?
# pwd
/
# chmod 777 system
Unable to chmod system: Read-only file system
Because the system directory under the root directory is a directory in the system file system.
Compile openwrt supports USB auto mount functionMake menuconfig
1) Add USB related support
Kernel modules —†USB Support —†“*†kmod-usb-core. ##Default has been selected
Kernel modules —†USB Support —†“*†kmod-usb-ohci. ##Default selected old usb1.0
Kernel modules —†USB Support —†“*†kmod-usb-uhci. ## usb1.1
Kernel modules —†USB Support —†“*†kmod-usb-storage.
Kernel modules —†USB Support —†“*†kmod-usb-storage-extras.
Kernel modules —†USB Support —†“*†kmod-usb2. ##The default has been selected usb2.0
2) Add SCSI support
Kernel modules —†Block Devices —†“*â€kmod-scsi-core ##The default is usb3.0? ?
3) Add USB mount
Base system —†“*†block-mount
4) Add an automount tool
UTIliTIes —†Filesystem —†“*†badblocks
5) Add file system support
Kernel modules —†Filesystems —†“*†kmod-fs-ext4 (mobile hard disk EXT4 format selection)
Kernel modules —†Filesystems —†“*†kmod-fs-vfat (FAT16 / FAT32 format selection)
Kernel modules —†Filesystems —†“*†kmod-fs-ntfs (NTFS format selection)
6) Add UTF8 encoding, CP437 encoding, ISO8859-1 encoding
Kernel modules —†NaTIve Language Support —†“*†kmod-nls-cp437
Kernel modules —†NaTIve Language Support —†“*†kmod-nls-iso8859-1
Kernel modules —†Native Language Support —†“*†kmod-nls-utf8
Utilities --- "disc ---" "*" fdisk. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Manipulated disk partition table
Utilities --- "*" usbutils. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . USB devices listing utilities
Exit save
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