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Method for a variable-speed HDD spindle

IP.com Disclosure Number: IPCOM000009099D
Publication Date: 2002-Aug-07
Document File: 2 page(s) / 32K

Publishing Venue

The IP.com Prior Art Database

Abstract

Disclosed is a method for a variable-speed hard disk drive (HDD) spindle. Benefits include improved performance and improved user satisfaction.

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Method for a variable-speed HDD spindle 

Disclosed is a method for a variable-speed hard disk drive (HDD) spindle. Benefits include improved performance and improved user satisfaction.

Background

              Conventionally, all physical hard disk drives work at a constant spindle speed (typically 4200, 5400, or 7200 RPM). As the drive gets full, performance starts to drop off because the faster outer tracks continue to fill up. When data is being written/read on the inner (slower) tracks, performance continues to degrade.

              No conventional techniques overcome the performance drop-off experienced for drives that are reaching their capacity.

              Hard drive platters are typically divided into 14 zones per platter. Zone bit recording (ZBR) ensures that aerial sector density is uniform across the entire platform. Older drives have outer tracks with aerial densities that are far less compared with the inner tracks.

Description

              The disclosed method is increased spindle speed as data is written towards a Hard disk drive’s inner tracks. For example, a typical mobile hard disk operating at 4200 RPM ramps up to 5400 RPM for the inner tracks with this suggested method (current practice is to keep the spindle speed constant across entire platter surface). A threshold is defined to ramp the spindle speed up/down after a particular zone on the platter (such as Zone 5).

              The increase in spindle speed results in a relatively constant transfer speed across the entire platter. The faster performance level is main...