Depends. If the platter substrate is ceramic, the arrow ought to be enough to shatter it. If it’s aluminum, then you have potential issues with the non-arrowy portion of the platter being recoverable. Even in that case, though, you’ve changed your threat model from “any idiot who finds the drive and plugs it in” to “people with specialized hardware for recovering data from damaged platters” – which is probably a sufficient security margin for those of us who aren’t interesting enough to have federal agents trawling through our garbage daily.
