Disk drive apparatus having security function using password
US5799145A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 2, 1996 |
| Grant date | Aug 25, 1998 |
| Priority date | — |
| Expiry date | Aug 2, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B20/00152
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Test data are written into all password data areas SDAs located on each of surfaces of a disk arranged in a disk drive apparatus. SDAs each having a low error rate are selected. A predetermined number of SDAs dispersed on the plural disk surfaces are selected as effective SDAs from the selected SDAs. Position data of these effective SDAs are registered in an EEPROM. A password is written into each of the effective SDAs in a low error rate order and the disk drive apparatus is set to a locked state. A password input by a user is compared with the password written into each of the effective SDAs to release the locked state. Therefore, when an unlock command is input, the password is read from each of the effective SDAs in the writing sequential order of the password. When the password is correctly read, the read password is compared with the password input by the user. The locked state is released only when these passwords coincide with each other.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.