The data storage device of the present invention can be validated through a network before the operation. According to one embodiment, the data storage device includes a head assembly having a read / write head for reading and writing data with respect to the magnetic disk and a magnetic disk. The data storage device, the head assembly further includes a controller configured to control the data read / written with respect to the magnetic disc. Further, the data storage device includes a secure area of the magnetic disk containing a private key. The private key is one of a pair of keys that is linked to the password mechanism, the other key of the pair of keys that are linked to the public key cryptography. In addition, the data storage device is disposed in the controller, a private key and a memory including a second key used for encryption or decryption,
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