Yes, it is the Linux file system. Trying to copy recordings between drives, even from an actual Linux system is problematic. I tried many years ago and had no luck. Instead, I purchased one of these hard drive duplicators (
Amazon product ASIN B019Y4JE22
View: https://www.amazon.com/10Gbps-Standalone-Duplicator-Dock-SATA/dp/B019Y4JE22) to make backup disks of my saved recordings. Works like a charm, but you need to use the same size drives, no good if you want to move everything to a larger drive. I am not done transferring all my 722 recordings to a larger EHD on the Hopper, I'm but getting close. I am going to start another thread when done, because in all honesty, the Hopper's support for external drives is very problematic when it comes to moving recordings between them.