https://docs.arenadata.io/en/l....anding-adpg/index.ht
The Flog measurement is determined by the NFree area within the BTT Info Block which determines how many of these flog entries there are. The flog location is the best address in the enviornment after area for the backup info block and alignment necessities have been taken in account. The Error and Zero bits point out situations that can't both be true at the same time, in order that mixture is used to point a normal map entry, the place no error or zeroed block is indicated. The error condition is indicated only when the Error bit i