Even though this could be a limitation by your file system check the value of the system variable:
myisam_data_pointer_size
If it’s set to 4 then the table can be a maximum of 4GB in size but if it’s set to 6 then the table can be a maximum of 256TB…
To fix this try:
edit /etc/my.cnf
And add this line to the end of it:
myisam_data_pointer_size = 6
Save it and restart mysql:
service mysql restart
I hope this helps…

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