README: Update hdd reqs, Twitter link

README.md

@@ -20,7 +20,7 @@ This repository contains the relevant Docker builds to run your own node on the
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@@ -32,7 +32,7 @@ This repository contains the relevant Docker builds to run your own node on the
 We recommend you have this configuration to run a node:
 
 - at least 16 GB RAM
-- an SSD drive with at least 1 TB free
+- an SSD drive with at least 2 TB free
 
 ### Troubleshooting