The hard drive is traditionally read as memory itself — everything you have stored away. Losing or wiping one stands for fear of forgetting or of losing your past.
Where in your waking life have you met something like this lately?
My Cosmic Code has a private dream journal. Write a dream down and the app picks out the symbols in it, shows what dream books say about them and, over time, which words recur across your entries. The journal is stored on your device only.