I opened up the PC and reseated RAM, lowered RAM from 3600mhz to 3200mhz, reseated HBA card, replaced HBA card SATA cables and moved cables to other slot. I have the RAIDZ4 on the LSI HBA card, and the mirror on the motherboard SATA, all with brand new cables. Why do I keep getting CKSUM errors? Every time it's a different random file with an error. Also the mirror should be rock solid running off the mobo (even if HBA is bad) and brand new cables and barely used drives. What is going on here?