Over time, the coating of HDD platters demagnetizes. What measures can be taken to avoid losing information?

Question

Iron

If you put the HDD in a safe, then in 10 years about 30% of the information will be irretrievably lost. That's what the theory says. Let's consider another case - the disk works in the server. Does the disk have self-healing mechanisms for degaussing sectors? For example, according to the schedule, go through, read and rewrite clusters, a kind of internal MHDD at the firmware level. Or are there no such mechanisms, and if only large-capacity backups are stored on a disk, without constant overwriting, then information can be lost anyway, even if this disk is connected and working?
It would be interesting to know what technical means can be used to restore the surface magnetization for super-capacious RAID arrays, which are used mainly for deduplication and store extremely rarely requested (and even less frequently changed) data of petabyte volumes?

Answer 1

There is only one mechanism - backup. Not necessarily complete every time, only changes can be saved...

Answer 2

there are no mechanisms

Answer 3

Ride in mirror mode - two discs with the same information!? What does not suit you how much you need to store 20-50 years! Fill in and store with the controller, but rather the whole computer for storage in a thermostat 15-18 C! In a lead metal grounded anti-vibration magnetic radiation box!

Answer 4

everything that colleagues said is just a flame, the reliability of information storage is only on magnetic tape, it is confirmed by HP.