Epson RC620 CU Manual page 185

(6) Make sure the Controller operate properly without any trouble.
RC620 Rev.8
Maintenance 6. Maintenance Parts Replacement Procedures
Select the [OnChip IDE Device].
Select the following in this order.
[On Chip Serial ATA Settings]
[On-Chip Serial ATA]
[Enhanced Mode]
Set the [Serial ATA Port 0 Mode] to "SATA0 Master".
Go back to the Main menu and select the [Save & Exit Setup].
Select "Y" and save the changed BIOS setting.
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