The hard drives in use at that time used different encoding methods than the ones we use today, so most of the passes the Gutmann method performs are completely useless for modern hard drives.
Ihe siri ike na-eji n'oge ahụ mee ihe n'ụzọ dịgasị iche iche karịa nke anyị na-eji taa, ya mere, ọtụtụ n'ime ihe Gutmann na-eme na-abaghị uru maka draịvụ nke oge a.