Disc-drive apparatus having function of preventing destruction of data
US5218504A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 18, 1991 |
| Grant date | Jun 8, 1993 |
| Priority date | — |
| Expiry date | Jun 18, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B19/04
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A disc-drive apparatus includes a writing unit responsive to a head select signal fed from a host controller, for selecting one of a plurality of heads to write write data into a medium, a power supply voltage generating unit for generating at least one power supply voltage, a unit for monitoring the power supply voltage fed to the writing unit and, upon detecting an abnormality of the monitored power supply voltage, outputting a reset signal, and a latching unit for retaining the head select signal to be fed to the writing unit. Upon receipt of the reset signal, the latching unit prohibits a latching and switching operation to be carried out by a subsequent head select signal fed from the host controller and maintains an output state of the retained head select signal, while the power supply voltage generating unit stops a supply of the power supply voltage to the writing unit. As a result, it is possible to prevent data in the medium from being destroyed due to a change or re-writing thereof by a malfunction of head selection operation occurring during a transient state of a lowering of the power supply voltage, or the like.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.