::::This is now being discussed at Talk:Disk_formatting#Three_levels_of_formating where there is some support for my belief    

 == File Systems == 
 Hi:  In your spare time -) you might take a glance at List of file systems and Comparison of file systems; this appears to me to be yet another PC (and minicomputer) oriented article completely oblivious to IBM and other mainframe systems.  There is some coverage at MVS#MVS_filesystem.  I will defer to your expertise in this matter, but it seems the lack of IBM Access Methods, BDAM, SAM, ISAM and VSAM from these articles is a serious omission.  Comment?