OK, you are using the minimal (!) 4k Blocksize which is optimal for storing lots of small files., but this is totally idiotic for doing PVR recordings.
Format it with at least 64k, or up to the maximum 2048kB and you will see the difference.
Poor NTFS performance isn't a Drembox One only Problem!
This problem is a known problem and exist over years.
Linux developers (not Dream Property!!!) not interested on NTFS.
They all use Linux Filesystem.
You have to learn, your request is for this…
dream one OS = Linux
NTFS is never the first choice for linux
It's not our problem, when you want to ignore this
Use a NAS.
You can connect with windows clients over CIFS/SMB/Samba AND with linux clients over NFS
The NAS can share the files…