UX: Disk Usage / Storage Free Space Widget

[nkonidaris]

A useful addition to the side bar or else where would be a disk/storage used/free widget indicating the used and free space of the mapped volumes, which in my case is an external HDD. This would give users a easy visual of how full their current storage medium is, allowing for upgrading of storage capacity, or otherwise.

An example is shown below,

P.S. I am about to become a member to support this great project! Keep up to good work!