Rebuilding windows for a new media centre. HD one has o/s & a few apps on it. HD 2 has about 1000 albums, all my photos, movies, vids, the whole nine yards. Both HD's identical models. Can you guess??
Exactly, went & formatted the wrong one.
Three years squirelling of media carked in about forty minutes flat. That was a good one. One now worships at the temple of backup.