It's been a long time since I've installed a program with this type of interface! From memory:
the leftmost vertical bar was the progress of the current directory being written to
Small directories would be written faster than large directories so they would appear to flash between full and empty, while larger directories would grow from bottom to top from ...
There are many possibilities. An option is the one DropBox uses for the ready and updating files:
The updated files have a green check icon
The files to be updated have a blue icon with the rotating arrows animation
In a lot of filesystem contexts, copying is used mainly because of the folder metaphor. That is, some information needs to appear in two "locations" because the folder metaphor implies each "file" exists in a finite number of physical locations. In a tag-based file system, a single file could be tagged with multiples tags to appear in multiple queries. So, e....