To make it more precisely: the head is parked outomatically even after powerloss when you just pull the plug.
If you are affraid that something went wrong you have to plug it in again and check the s.m.a.r.t. status. On windows chrystaldiskinfo is a nice tool.
But this is not a 100% prediction that your drive will fail when you use it.
You could plug it in and run a backup or send it in to a professional and spend a lot of money. Depending on the worth of the data.