O.K., IFF, I think I see what you mean by "pure consciousness." You do not identity it as consciousness without content. As I suggested somewhere above, consciousness is (by definition) always OF something (like the word, focus), but in your "pure" consciousness that "purity" occurs because of the absence of memory. After a period of intense (but profoundly passive/unfocused) awareness one realizes that one was intensely aware of UNRECALLED/UNRECALLABLE content; you have a vague memory of having meditated and that you experienced images, sensations, feelings, thoughts but without having latched onto them (grasping or attaching), i.e., that they simply passed through the mind without footprints, as it were.
I'm not adquately aware of the philosophical literature on consciousness. Fresco has provided us with a good link (that I've only scanned so far) regarding the work of David Chalmers, a pioneering specialist in the area:
http://consc.net/online.html