MAGNETIC TAPE PROCESSING

• US 20150302879A1
• Filed: 01/31/2013
• Published: 10/22/2015
• Est. Priority Date: 01/31/2013
• Status: Active Grant

• Current Assignee: Hewlett Packard Enterprise Development LP (Hewlett-Packard Enterprise Company)
• Original Assignee: Hewlett-Packard Development Company, L.P. (HP Inc.)
• Inventors: HOLMBERG, Mike Alan, SPRATT, Geoff, BRONG, Brian, SHARROCK, Mike, BRITTENHAM, Steven L., SWANBECK, Scott A., PETERSEN, Eric, HANSEN, Lawrence A., POORMAN, Paul W.
• Granted Patent: US 9,336,808 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: G11B 20/10287 using probabilistic methods, e.g. maximum likelihood detectors G11B20/10277 takes precedence
• CPC Class Codes: G11B 2005/0021 Thermally assisted recording using an auxiliary energy source for heating the recording layer locally to assist the magnetization reversal
• CPC Class Codes: G11B 5/00813 magnetic tapes
• CPC Class Codes: G11B 5/00826 comprising a plurality of single poles or gaps or groups thereof operative at the same time
• CPC Class Codes: G11B 5/09 Digital recording
• CPC Class Codes: G11B 5/3903 using magnetic thin film layers or their effects, the films being part of integrated structures
• CPC Class Codes: G11B 5/6011 Control of flying height
• CPC Class Codes: G11B 5/78 Tape carriers

Abstract

A system including a magnetic tape processing system that includes a read/write head to write to a top surface of a magnetic tape. The read/write head provides a write head field gradient of at least 40 Oersteds per nanometer at the top surface of the magnetic tape. The magnetic tape processing system and the read/write head provide a track density of greater than 8000 tracks per inch, a bit density of greater than 440 kilo-bits per inch, and an aspect ratio of less than 70.

Claims

1. A system comprising:

a magnetic tape processing system that includes a read/write head to write to a magnetic tape and provide a write head field gradient of at least 40 Oersteds per nanometer at a top surface of the magnetic tape and to provide a track density of greater than 8000 tracks per inch, a bit density of greater than 440 kilo-bits per inch, and an aspect ratio of less than 70.

2. The system of claim 1, wherein spacing between a bottom surface of the read/write head and the top surface of the magnetic tape is between 0 and 100 nanometers to write to the magnetic tape.

3. The system of claim 1, wherein the average roughness of the magnetic tape is less than 6 nanometers, the root mean square roughness of the magnetic tape is less than 18 nanometers, and the average of the five highest maximum heights of the profile along a sample length roughness of the magnetic tape is less than 30 nanometers.

4. The system of claim 1, wherein the magnetic tape includes an abrasive leader to make contact with a bottom surface of the read/write head to dean the read/write head.

5. The system of claim 1, wherein the magnetic tape processing system to provide tape tension of less than 4 newtons.

6. The system of claim 1, wherein the magnetic tape processing system provides a channel that includes at least one of a partial response maximum likelihood channel, a class IV partial response channel, a maximum likelihood detector channel, and a least density parity code channel.

7. The system of claim 1, wherein the read/write head includes a magneto-resistive (MR) read element configured to read data from the top surface of the magnetic tape.

8. The system of claim 1, wherein the magnetic tape is a sputtered magnetic medium tape.

9. A data storage system comprising:

a magnetic tape processing system that includes a heat assisted read/write head to increase temperature of a magnetic tape and lower coercivity of the magnetic tape to write to the magnetic tape.

10. The data storage system of claim 9, wherein the magnetic tape processing system to provide a track density of greater than 8000 tracks per inch, a bit density of greater than 440 kilo-bits per inch, and an aspect ratio of less than 70.

11. The data storage system of claim 9, wherein the heat assisted read/write head includes a magneto-resistive (MR) read element configured to read data from a top surface of the magnetic tape.

12. The data storage system of claim 9, wherein the average roughness of the magnetic tape is less than 6 nanometers, the root mean square roughness of the magnetic tape is less than 18 nanometers, and the average of the five highest maximum heights of the profile along a sample length roughness of the magnetic tape is less than 30 nanometers.

13. A method comprising:

spacing a read/write head between 0 and 100 nanometers from a top surface of a magnetic tape and a bottom surface of the read/write head;

providing a read/write head field gradient of at least 40 Oersteds per nanometer at the top surface of the magnetic tape using the read/write head; and

writing to the magnetic tape using the read/write head.

14. The method of claim 13, wherein the read/write head provides a track density of greater than 8000 tracks per inch, a bit density of greater than 440 kilo-bits per inch, and an aspect ratio of less than 70.

15. The method of claim 13, wherein the read/write head includes a magneto-resistive (MR) read element configured to read data from the top surface of the magnetic tape.