ReadyNas Ultra RND4000 ATA5 errors, new disk not recognized

I left for the weekend and powered down my ReadyNAS and when I turned it back on Frontview showed me that disk3 was dead. I ordered a new 2tb replacement drive, plugged it in and no resync started. Frontview shows the old disk information with status 'dead'. I start looking further and I see these messages on startup:

ata5: SATA max UDMA/133 abar m2048@0xfe87b000 port 0xfe87b300 irq 42
ata5: link is slow to respond, please be patient (ready=0)
ata5: COMRESET failed (errno=-16)
ata5: SATA link down (SStatus 1 SControl 300)
ata5: exception Emask 0x10 SAct 0x0 SErr 0x4040000 action 0xe frozen
ata5: irq_stat 0x00000040, connection status changed
ata5: SError: { CommWake DevExch }
ata5: hard resetting link
ata5: SATA link down (SStatus 1 SControl 300)
ata5: EH complete
ata5: exception Emask 0x10 SAct 0x0 SErr 0x4040000 action 0xe frozen
ata5: irq_stat 0x00000040, connection status changed
ata5: SError: { CommWake DevExch }
ata5: limiting SATA link speed to 1.5 Gbps
ata5: hard resetting link
ata5: COMRESET failed (errno=-32)
ata5: reset failed (errno=-32), retrying in 8 secs
ata5: hard resetting link
ata5: SATA link down (SStatus 1 SControl 310)
ata5: EH complete
ata5: exception Emask 0x10 SAct 0x0 SErr 0x4040000 action 0xe frozen
ata5: irq_stat 0x00000040, connection status changed
ata5: SError: { CommWake DevExch }
ata5: limiting SATA link speed to 1.5 Gbps
ata5: hard resetting link
ata5: SATA link down (SStatus 1 SControl 310)
ata5: EH complete
ata5: exception Emask 0x10 SAct 0x0 SErr 0x4040000 action 0xe frozen
ata5: irq_stat 0x00000040, connection status changed
ata5: SError: { CommWake DevExch }
ata5: limiting SATA link speed to 1.5 Gbps
ata5: hard resetting link
ata5: link is slow to respond, please be patient (ready=0)
ata5: COMRESET failed (errno=-16)
ata5: hard resetting link
ata5: link is slow to respond, please be patient (ready=0)
ata5: COMRESET failed (errno=-16)
ata5: hard resetting link
ata5: link is slow to respond, please be patient (ready=0)
ata5: COMRESET failed (errno=-16)
ata5: hard resetting link
ata5: COMRESET failed (errno=-16)
ata5: reset failed, giving up
ata5: EH complete

Is this a disk error or a readynas hardware error?

Thanks!