Josh wants to know if he should buy all one brand of hard drives for his QNAP NAS or if he could mix them. Leo says that there's no problem with mixing drives, but he should make sure that the drive size is consistent, as most RAIDs will manage according to the smallest size. If he's buying it all at once, then it makes sense to buy the same drive, but if he's getting a great deal on different hard drives, then by all means, he should save the money.
Ron picked up several 4TB Seagate drives, and he's wondering if he can use the A drive and B drive slots with the hard drives. Leo says that the floppy disc controllers are long gone. And Microsoft still uses drive names for compatibility issues. So no, they won't work.
Jeff just installed an SSD into his Lenovo desktop, but he can't enable AHCI (Advanced Host Controller Interface). Leo says it's in the kernel, but it doesn't mean it has to be enabled. Leo suggests using native mode since Jeff only has one drive anyway. He'll get the best performance he can for SATA 2, but he'll still have a speed improvement over the old hard drive.