In a recent post 'jrazz' mentioned the practice of archiving to HDD. With the current price of drives this is a very effective method. However what is the life of data on a drive which is just sitting there on the shelf? Surely the disks will eventually demagnetise? If so is there now a program to "refresh" the stored data? (takes you back to core memory which "refreshed" after every read). Or am I worrying about nothing?