Software to visually display areas that are non zero-filled?

Hi,

I'm looking for a software, preferably for Linux and with a GUI, to display which areas of a drive contain data else than 0x00, and which would ideally allow to click in those areas to explore their content with an hexadecimal editor.

The areas filled with 0x00 should be display in white and other ones with a color.
(Something like the view that the defragmenter offers in Windows for instance, but for RAW data.)

A list like this could be suitable too
"area #1" "from 0x…" "to 0x…"
"area #2" "from 0x…" "to 0x…"
"area #3" "from 0x…" "to 0x…"
…

In fact, as the non-zero areas should be allowed to contain a few 0x00 bytes, the software should detect only long series of 0x00 and find from that where the contents are located.

Any suggestion ?