Browse Prior Art Database

Flexible Disk Drive (FDD) Downward Compatible Head-Disk Interface (HDI)

IP.com Disclosure Number: IPCOM000038146D
Original Publication Date: 1989-Nov-01
Included in the Prior Art Database: 2005-Jan-31
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

LePage, JD: AUTHOR

Abstract

This head-disk interface (HDI) has high-capacity and low-capacity read/write modes.

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Flexible Disk Drive (FDD) Downward Compatible Head-Disk Interface (HDI)

This head-disk interface (HDI) has high-capacity and low-capacity read/write modes.

High-capacity mode uses a sector servo for radial and azimuth control and a parallel 4-bit (byte) read/write process.

During the write function (see the figure), write drivers W1 through W4 are active. For position control of the R/W heads when writing, preamps A1 through A4 and azimuth and radial control are active during position control time.

When conducting a read operation, preamps A1 through A4 and azimuth and radial control are active for read and write position control times.

Low-capacity mode utilizes an open-loop actuator, a factor of 4 lesser track pitch, and a serial output.

During the write function, only write driver W5 is active. The write current flows through R/W coils 3, 4, 5, and 6.

When in read mode, only read preamp A5 is active. A5 will read the original developed across R/W coils 3, 4, 5, and 6.

Disclosed anonymously.

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