I use 5 nodes to create a cluster of Cassandra. (SSD 1TB)

I'm trying to mount an additional disk(SSD 1TB) on each node because each disk 
usage growth rate is higher than I expected. Then I will add the the directory 
to data_file_directories in cassanra.yaml

Can I get advice from who have experienced this situation?
If we go through the above steps one by one, will we be able to complete the 
upgrade without losing data?
The replication strategy is SimpleStrategy, RF 2.

Thank you in advance
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