Twice in the last few days my computer has frozen with the hdd light staying on solid. A reset has fixed the problem but Im suspecting that my HDD could be on its way out but I have 2 ATA drives and 1 SATA drive.

Would it be my main hdd with the operating system on it if the hdd light is staying on solid like that or could this still happen even if it was one of my other drives??

Also if I get another SATA drive so Ive got 2 x SATA and 1 ATA whats my best option to install the OS on, the SATA or the ATA?

Thanks for the help.