Detect, mount, format devices

Detect devices:

1. lsblk : prints all block devices (except RAM disks) in a tree-like format by dafault. More clear than comman "mount"
2. mount -l \ -a (man mount for more details)
3. file : determine file type
4. df -h
5. lsusb
6. sudo fdisk -l 

Mount devices:

1. mount -t type device dir  
• we can find some device in /dev/disk/.......
• usually linux can automatically detect file system type, so we don't need "-t"
• example: mount /dev/sdf4  /media/usb
• if path "/media/sdf4" is not exsited, we need create a new directory to mount device

Umount devices :

1. umount device