There is no need for any such "refresh" programs, especially considering they absolutely cannot refresh all of the magnetic data anyway. Here is a relevant citation on the subject written by a former HDD engineer: https://groups.google.com/forum/?hl=en# ... fCIyPj7poJ
The biggest problem I've seen with older drives that are allowed to sit non-operating for extended periods of time is stiction
. Fortunately that can often be overcome by mechanical means.
As with all discussions of data storage, having multiple, reliable, off-line backups are your best insurance. If you have important data on older drives it might be a good idea to make backups on newer drives. As older interfaces and systems become obsolete, it is often difficult to find a compatible system, controller card, cables, etc. to make an older drive work at all. Scott.