Browse Prior Art Database

Hard Drive Data Loss Prevention

IP.com Disclosure Number: IPCOM000126306D
Original Publication Date: 2005-Jul-12
Included in the Prior Art Database: 2005-Jul-12
Document File: 1 page(s) / 19K

Publishing Venue

IBM

Abstract

Current hard disk drives stop all operations when the drives DC voltages (typically 5 and 12 volts) drop below 5% of their nominal values. This means if a drive is writing a sector writing it may stop writing before the end of the sector where the ECC field is located. Thus when the sector is read the data in most cases will not be readable. The drive will return an ECC uncorrectable data error. This disclosure describes a method where the drive will shut down writing on a sector boundary so no data is lost on an unexpected loss of drive power.

This text was extracted from a PDF file.
This is the abbreviated version, containing approximately 100% of the total text.

Page 1 of 1

Hard Drive Data Loss Prevention

All recent hard drives have circuitry that monitor the DC input supply voltage levels. Presently these circuits are designed to shut down the drives operation in a orderly manner (i.e. stop writing and retract heads from the media and place them in the landing zone or unloading them from the media). However no attempt is made to shut down writing at a sector boundary. This practice is likely because in the past the time it took to write a sector was hundreds of microseconds or even milliseconds. However at current hard drive circumferential bit densities sectors are written in 10 microseconds or less. Thus if the drives voltage monitoring circuits trip thresholds are set properly it should be possible to wait until a sector boundary before terminating a write operation. Thus it should be possible in most cases to prevent ECC Uncorrectable errors from occurring due to unexpected power losses.

1