1     Buf - no free cache buffers (all in use)
2     chInUse - requested block in use
3     chnotfound - requested block not found
4     chNotInUse - block being released was not in use
16    fxRangeErr - file position beyond mapped range
17    fxOvFlErr - extents file overflow
32    btnotfound - record not found
33    btexists - record already exists
34    btnospace - no available space
35    btnoFit - record doesn't fit in node 
36    btbadNode - bad node detected
37    btbadHdr - bad BTree header record detected
48    cmnotfound - CNode not found
49    cmexists - CNode already exists
50    cmnotempty - directory CNode not empty (valence = 0)
51    cmRootCN - invalid reference to root CNode
52    cmbadnews - detected bad catalog structure
53    cmFThdDirErr - thread belongs to a directory not a file
54    cmFThdGone - file thread doesn't exist
64    dsBadRotate - bad BTree rotate