[RinaseaofDs]

If it isn’t a solid state drive, you can use a magnet on it and you are good to go.

[GingisK]

Since disk platters are in a shield, a really strong magnet would be required.

[Dr. Sivana]

If it isn’t a solid state drive, you can use a magnet on it and you are good to go.

Besides the shielding, even if you did have a a heavy duty magnetic, you may mess up the low level formatting info on a modern SATA drive, which could make the drive fail completely. Modern drives don't allow you to do real low level formatted from the OS, as he drives come pre-encoded. Anyone who had to low level format drives with DEBUG, etc. appreciates the convenience, but some control is the cost.