If you are running sata HDD's yes you will find problems with your disk. Even normal MC will sometimes cap you out on your HHD's. The IOP's from a HDD are at max 200 IOP's. Compare that to a SSD that has over 100.000 even up to 200.000 IOP's. And since minecraft is writing and rewriting multiple worlds, player files, and much more, your IOP's will cap out VERY fast on a HDD, even 4 HHD's in raid 0.
(IOP's is a term reffering to Operations Per Second. )