myisamchk and table corruption

Hello list, This is the output of mysql myisamchk -s */*.MYI, which seems very badly corrupted. I know myisamchk -o or myisamchk -c will rescue this, but is any idea to know what made the corruptions? myisamchk: ISAM file stocks/TimelyDeals.MYI myisamchk: error: Size of datafile is: 5645430

myisamchk and table corruption

Hello list, This is the output of mysql myisamchk -s */*.MYI, which seems very badly corrupted. I know myisamchk -o or myisamchk -c will rescue this, but is any idea to know what made the corruptions? myisamchk: ISAM file stocks/TimelyDeals.MYI myisamchk: error: Size of datafile is: 5645430