I guess it's a typo, but if you really use DIOS MIOS 2.1, update to 2.10
be careful when you give the version number, it's not a base 10, after 2.9 it's not 3.0 but "2.10" (2 is the major version, 10 is the minor version. )
Seagate are not always compatible.
I have a Seagate Free agent Go, and it's randomly compatible because the USB adapter doesn't provide the correct data to the host (sometime it provides "seagate" and sometime it provides "OEM HDD" as drive name, and a different PID/VID and interface).
When Seagate provide "OEM", DIOS MIOS is waiting in a HDD reset loop until the interface provide the correct drive name which never come, that's why it freeze on a black screen (before the loader's splash screen).
The solution is to shut down and try again few times until it works. (be sure that your drive is correctly setup, correct partition format, cluster size, etc.)
If after ~10 tries it still doesn't work, it's probably your drive which is not compatible.