Magnetic tape processing

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.

What is claimed is: 
     
         1 . A magnetic tape processing system comprising:
 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.   
     
     
         2 . The magnetic tape processing system of  claim 1 , wherein a 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 magnetic tape processing 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 magnetic tape processing system of  claim 1 , the magnetic tape processing system to provide a track density of greater than 8000 tracks per inch. 
     
     
         5 . The magnetic tape processing system of  claim 1 , the magnetic tape processing system to provide tape tension of less than 4 newtons. 
     
     
         6 . The magnetic tape processing system of  claim 1 , the magnetic tape processing system to provide a bit density of greater than 440 kilo-bits per inch. 
     
     
         7 . The magnetic tape processing system of  claim 1 , the magnetic tape processing system to provide an aspect ratio of less than 70. 
     
     
         8 . The magnetic tape processing 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. 
     
     
         9 . A data storage system comprising:
 a take-up device for a magnetic tape; and   a magnetic tape processing system that includes a read/write head to write to the magnetic tape, and to provide a write head field gradient of at least 40 Oersteds per nanometer.   
     
     
         10 . The data storage system of  claim 9 , the magnetic tape processing system to provide a track density of greater than 8000 tracks per inch. 
     
     
         11 . The data storage system of  claim 9 , the magnetic tape processing system to provide a bit density of greater than 440 kilo-bits per inch. 
     
     
         12 . The data storage system of  claim 9 , the magnetic tape processing system to provide an aspect ratio of less than 70. 
     
     
         13 . The data storage system of  claim 9 , the take-up device to provide tape tension of less than 4 newtons. 
     
     
         14 . The data storage system of  claim 9 , wherein a 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. 
     
     
         15 . 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. 
     
     
         16 . A method comprising:
 providing a read/write head field gradient of at least 40 Oersteds per nanometer at the top surface of a magnetic tape using a read/write head; and   writing to the magnetic tape using the read/write head field gradient.   
     
     
         17 . The method of  claim 16 , further comprising using the read/write head to provide a track density of greater than 8000 tracks per inch. 
     
     
         18 . The method of  claim 16 , further comprising using the read/write head to provide a bit density of greater than 440 kilo-bits per inch. 
     
     
         19 . The method of  claim 16 , further comprising using the read/write head to provide an aspect ratio of less than 70. 
     
     
         20 . The method of  claim 16 , further comprising providing a tape tension of less than 4 newtons.