I have a 4-tuner Bolt that I upgraded with a 4TB Seagate internal drive in March of 2017. This past month it had two episodes of not working with all four LED's flashing. Both times I rebooted and it continues to work for now. The drive is approximately 50% full. I would like to install an Ext. 8TB 3.5" drive using MFSR to expand it using Sata-Sata connections. I want to keep all of the recordings/etc. if possible. I would like to have a forum expert recommend to me a process for this if possible, with the inherent risks if any. Once I have the process identified I feel confident that I can do it. Thanks for any help provided!