# Mount
The `mount` command mounts a storage device or file system, making it accessible and attaching it to an existing directory structure. This attached directory is called a **mount point**. In this way, users can access a storage device or filesystem just like a normal directory.
Remember to **unmount** after using, otherwise the file system is not fully synchonized, which will cause loss of data.
## Steps
1. First, create a **mount point**:
```
$ mkdir ~/rd
```
2. Then, we mount the disk to the **mount point**:
```
$ sudo mount -t vfat -o loop test.disk ~/rd
```
3. After that, we can unmount the disk by:
```
$ sudo umount ~/rd
```
## How to solve device busy problem (Study by yourself)
There is the case where a process continously occupies the device such that you cannot unmount it.
In this case,we can make use of either one of the two commands to locate the process.
### Method 1: lsof
```
$ lsof ~/rd
```
### Method 2: fuser
```
$ fuser -vm ~/rd
```
By these two commands, you can know `tail` with PID 11793 is occupying the resource. By killing it using`kill -9`, you can umount the resource successfully.