Information storage systems comprising a liquid bearing maintained by adsorption isotherm

• US 6,031,685 A
• Filed: 07/11/1997
• Issued: 02/29/2000
• Est. Priority Date: 07/11/1997
• Status: Expired due to Term

• Current Assignee: Seagate Technology LLC (Seagate Technology Holdings Plc)
• Original Assignee: Seagate Technology plc (Seagate Technology Holdings Plc)
• Inventors: French, William, Smith, James H.
• Primary Examiner(s): OMETZ, DAVID LOUIS
• Application Number:
  US08/891,492
• Time in Patent Office: 963 Days
• Field of Search: 360/97.01, 360/97.02, 360/97.03, 360/102, 360/103, 360/135, 428/694 TF, 428/694 TP, 428/694 BP, 428/695, 428/900
• US Class Current: 360/97.01
• CPC Class Codes: G11B 5/6005 Specially adapted for spacing from a rotating disc using a fluid cushion

Abstract

Information storage systems having a liquid bearing of at least 2 molecular layers on the surface of a rigid storage medium are provided. The liquid bearing lubricant of the subject invention has a low viscosity, high vapor pressure organic liquid. The liquid bearing is maintained on the surface of the rigid storage medium by vapor phase transfer, where the gaseous environment of the rigid storage medium is maintained in a saturated state with respect to the low viscosity, high vapor pressure organic liquid of the liquid bearing. Also provided are novel read/write heads for use in the subject information storage systems.

Claims

1. A disk for use in an information storage system characterized in that a liquid bearing comprising a low viscosity, high vapor pressure organic liquid layer is disposed on the surface of said disk and said liquid layer having a thickness of at least two molecular layers, and where the gaseous environment of said disk is saturated with respect to said low viscosity, high vapor pressure organic liquid layer and a non-Langmuir adsorption isotherm maintains the liquid layer having a thickness of at least two or more molecular layers on the surface of said disk.

2. The disk according to claim 1 wherein said liquid bearing has a viscosity ranging from about 0.1 to 10 cP at 25°

C.

3. The disk according to claim 1 wherein said liquid bearing has a viscosity ranging from about 2 to 4 cP at 25°

C.

4. The disk according to claim 1 wherein said liquid bearing has a vapor pressure ranging from about 0.001 to 500 Torr at 25°

C.

5. The disk according to claim 1 wherein said liquid bearing has a vapor pressure ranging from about 0.01 to 100 Torr at 25°

C.

6. The disk according to claim 1 wherein said liquid bearing has a vapor pressure ranging from about 0.05 to 5 Torr at 25°

C.

7. The disk according to claim 1 wherein said liquid bearing is selected from the group of a non-Newtonian liquid, fluorocarbon and perfluoropolyether.

8. The disk according to claim 1 wherein said liquid bearing is 2,2,4,4,6,8,8-heptamethylnonane.

9. The disk according to claim 1 wherein said liquid bearing is comprised of a mixture of 2,2,4,4,6,8,8-heptamethylnonane and between 0.01 and 1% by weight of 2,6-di-t-butyl-4-methyl phenol (BHT).

10. The disk according to claim 1 wherein the surface of said disk is a smooth, polished, non-textured surface.

11. A disk drive having the disk of claim 1 and further comprising:

a sealed housing having an interior;

an actuator;

at least one read/write head having a read/write element mounted on said actuator;

a motor for rotating said disk; and

a controller for providing control signals to the actuator for positioning said read/write head and reading data from, and writing data to, said disk.

12. The disk drive of claim 11 wherein said liquid bearing has a viscosity ranging from about 2 to 4 cP at 25°

C.

13. The disk drive of claim 11 wherein said liquid bearing has a vapor pressure ranging from about 0.01 to 100 Torr at 25°

C.

14. The disk drive of claim 11 wherein said liquid bearing is selected from the group of a non-Newtonian liquid, fluorocarbon and perfluoropolyether.

15. The disk drive of claim 11 wherein said liquid bearing is 2,2,4,4,6,8,8-heptamethylnonane.

16. A disk for use in an information storage system, comprising:

means for lubricating the disk with a liquid bearing means;

said liquid bearing means comprising a low viscosity, high vapor pressure organic liquid layer disposed on the surface of the disk and said liquid layer having a thickness of at least two molecular layers, and where the gaseous environment of the disk is saturated with respect to said liquid bearing means and a non-Langmuir adsorption isotherm maintains said liquid bearing means having a thickness of at least two or more molecular layers on the surface of the disk.

17. The disk of claim 16 wherein said liquid bearing is selected from the group of a non-Newtonian liquid, fluorocarbon and perfluoropolyether.

18. The disk of claim 16 wherein said liquid bearing is 2,2,4,4,6,8,8-heptamethylnonane.