Is there any tool (analogous to “GetDataBack” for Windows OS) for saving some user’s files from damaged QNX4 partition (first few blocks of system data) and putting them to the other QNX4 partition 
First there is chkfsys. Then there is disk_raw available on QNX ftp sites and finalty when everything else fails there is spatch.
Unfortunatly performig such recover under QNX is a very very tedious task.