On Sun, 5 Feb 2012, Egan Ford wrote:
BTW, is there a NIB format description floating around anywhere?
Perhaps, but it's dead simple - 35 tracks of 6656 bytes (6.5 KB) each. Each byte represents "nibble" as read from the disk controller. Since this size is bigger than real track, it also contains leftovers that at least in the case of unprotected software should be harmless (they can be even partial sector). Each track should be regarded as circular and there is no guarantee how it will start (like, in the middle of a sector).
HTH.