High-precision servo system for advanced magnetic tape storage system
A servo system for a magnetic tape storage system includes a magnetic tape ( 550 ) including a first servo band ( 573 ), and a first data band ( 575 ). An auxiliary servo pattern ( 575 A) is embedded within the first data band ( 575 ). The auxiliary servo pattern ( 575 A) is modified to generate an updated auxiliary servo pattern ( 688 A) during a writing pass as data is being written to the first data band ( 575 ). The servo system can further include a magnetic tape drive ( 326 ) including a head assembly ( 456 ) having (i) a first write head ( 482 ) that writes data to the magnetic tape ( 550 ) as the magnetic tape ( 550 ) moves relative to the head assembly ( 456 ) in a first tape direction, (ii) a second write head ( 484 ) that writes data to the magnetic tape ( 550 ) as the magnetic tape ( 550 ) moves relative to the head assembly ( 456 ) in a second, opposite tape direction, and (iii) an auxiliary servo reader ( 487 ) positioned in a shadow of one of the first write head ( 482 ) and the second write head ( 484 ).
1. A servo system for use within a magnetic tape storage system, the servo system comprising:
a magnetic tape including (i) a first servo band including a timing-based servo pattern, and (ii) a first data band that is configured such that data is to be written to and read from the first data band;
wherein an auxiliary servo pattern is embedded within the first data band; and
wherein the auxiliary servo pattern is modified to generate an updated auxiliary servo pattern during a writing pass as data is being written to the first data band.
2. The servo system of claim 1 wherein the auxiliary servo pattern is an initial auxiliary servo pattern that is embedded within the first data band by a tone writer prior to any data being written to the first data band.
3. The servo system of claim 2 further comprising a magnetic tape drive including a head assembly that is configured to write data to the first data band of the magnetic tape; and wherein the tone writer is positioned within the magnetic tape drive.
4. The servo system of claim 2 wherein the tone writer is configured to embed the initial auxiliary servo pattern within the first data band during manufacturing of the magnetic tape.
5. The servo system of claim 1 further comprising a magnetic tape drive including a head assembly that is configured to write data to the first data band of the magnetic tape, the head assembly having (i) a first write head that is configured to write data to the magnetic tape as the magnetic tape moves relative to the head assembly in a first tape direction, (ii) a second write head that is configured to write data to the magnetic tape as the magnetic tape moves relative to the head assembly in a second tape direction that is opposite to the first tape direction, and (iii) an auxiliary servo reader that is positioned in a shadow of one of the first write head and the second write head.
6. The servo system of claim 5 wherein the second write head is further configured to modify the auxiliary servo pattern to generate the updated auxiliary servo pattern during a writing pass as data is being written by the first write head to the first data band; and wherein the auxiliary servo reader is configured to read the updated auxiliary servo pattern during the writing pass to determine a lateral position of the head assembly relative to the magnetic tape.
7. The servo system of claim 6 wherein the second write head employs ac erase functionality to modify the auxiliary servo pattern to generate the updated auxiliary servo pattern during the writing pass as data is being written by the first write head to the first data band.
8. The servo system of claim 6 wherein the magnetic tape drive further includes (i) a drive controller that is communicatively coupled to the head assembly, the drive controller being configured to receive information from the auxiliary servo reader to generate a signal based at least in part on the updated auxiliary servo pattern that has been read by the auxiliary servo reader during the writing pass; and (ii) an actuator that is coupled to the head assembly, the actuator being controlled by the drive controller to adjust the lateral position of the head assembly relative to the magnetic tape based at least in part on the updated auxiliary servo pattern that has been read by the auxiliary servo reader during the writing pass.
9. The servo system of claim 5 wherein the head assembly includes (i) a first bump in the form of a forward write bump that includes the first write head, (ii) a second bump in the form of a read head bump that includes the auxiliary servo reader, and (iii) a third bump in the form of a reverse write bump that includes the second write head.
10. The servo system of claim 5 wherein the head assembly further includes a TBS servo reader that is configured to read the timing-based servo pattern included in the first servo band.
11. A servo system for use within a magnetic tape storage system, the servo system comprising:
a magnetic tape drive including a head assembly having (i) a first write head that is configured to write data to a magnetic tape as the magnetic tape moves relative to the head assembly in a first tape direction, (ii) a second write head that is configured to write data to the magnetic tape as the magnetic tape moves relative to the head assembly in a second tape direction that is opposite to the first tape direction, and (iii) an auxiliary servo reader that is positioned in a shadow of one of the first write head and the second write head;
wherein the magnetic tape includes a first data band that is configured such that data is to be written to and read from the first data band;
wherein an auxiliary servo pattern is embedded within the first data band; and
wherein the auxiliary servo pattern is an initial auxiliary servo pattern that is embedded within the first data band by a tone writer prior to any data being written to the first data band.
12. The servo system of claim 11 wherein the tone writer is positioned within the magnetic tape drive.
13. The servo system of claim 11 wherein the tone writer is configured to embed the initial auxiliary servo pattern within the first data band during manufacturing of the magnetic tape.
14. The servo system of claim 11 wherein the head assembly includes (i) a first bump in the form of a forward write bump that includes the first write head, (ii) a second bump in the form of a read head bump that includes the auxiliary servo reader, and (iii) a third bump in the form of a reverse write bump that includes the second write head.
15. The servo system of claim 11 wherein the head assembly further includes a TBS servo reader that is configured to read a timing-based servo pattern included in a first servo band of the magnetic tape.
16. A servo system for use within a magnetic tape storage system, the servo system comprising:
a magnetic tape drive including a head assembly having (i) a first write head that is configured to write data to a magnetic tape as the magnetic tape moves relative to the head assembly in a first tape direction, (ii) a second write head that is configured to write data to the magnetic tape as the magnetic tape moves relative to the head assembly in a second tape direction that is opposite to the first tape direction, and (iii) an auxiliary servo reader that is positioned in a shadow of one of the first write head and the second write head;
wherein the magnetic tape includes a first data band that is configured such that data is to be written to and read from the first data band;
wherein an auxiliary servo pattern is embedded within the first data band; and
wherein the auxiliary servo pattern is modified to generate an updated auxiliary servo pattern during a writing pass as data is being written to the first data band.
17. The servo system of claim 16 wherein the second write head is further configured to modify the auxiliary servo pattern to generate the updated auxiliary servo pattern during a writing pass as data is being written by the first write head to the first data band; and wherein the auxiliary servo reader is configured to read the updated auxiliary servo pattern during the writing pass to determine a lateral position of the head assembly relative to the magnetic tape.
18. The servo system of claim 17 wherein the second write head employs ac erase functionality to modify the auxiliary servo pattern to generate the updated auxiliary servo pattern during the writing pass as data is being written by the first write head to the first data band.
19. The servo system of claim 17 wherein the magnetic tape drive further includes (i) a drive controller that is communicatively coupled to the head assembly, the drive controller being configured to receive information from the auxiliary servo reader to generate a signal based at least in part on the updated auxiliary servo pattern that has been read by the auxiliary servo reader during the writing pass, and (ii) an actuator that is coupled to the head assembly, the actuator being controlled by the drive controller to adjust the lateral position of the head assembly relative to the magnetic tape based at least in part on the updated auxiliary servo pattern that has been read by the auxiliary servo reader during the writing pass.
20. The servo system of claim 16 wherein the head assembly includes (i) a first bump in the form of a forward write bump that includes the first write head, (ii) a second bump in the form of a read head bump that includes the auxiliary servo reader, and (iii) a third bump in the form of a reverse write bump that includes the second write head.
21. The servo system of claim 16 wherein the head assembly further includes a TBS servo reader that is configured to read a timing-based servo pattern included in a first servo band of the magnetic tape.
22. A servo system for use within a magnetic tape storage system, the servo system comprising:
a magnetic tape including (i) a first servo band including a timing-based servo pattern, and (ii) a first data band that is configured such that data is to be written to and read from the first data band, an auxiliary servo pattern being embedded within the first data band by a tone writer prior to any data being written to the first data band; and
a magnetic tape drive including a head assembly having (i) a first write head that is configured to write data to a magnetic tape as the magnetic tape moves relative to the head assembly in a first tape direction, (ii) a second write head that is configured to write data to the magnetic tape as the magnetic tape moves relative to the head assembly in a second tape direction that is opposite to the first tape direction, (iii) a TBS servo reader that is configured to read the timing-based servo pattern included in the first servo band of the magnetic tape, and (iv) an auxiliary servo reader that is positioned in a shadow of one of the first write head and the second write head;
wherein the second write head is further configured to modify the auxiliary servo pattern to generate an updated auxiliary servo pattern during a writing pass as data is being written by the first write head to the first data band; and
wherein the auxiliary servo reader is configured to read the updated auxiliary servo pattern during the writing pass to determine a lateral position of the head assembly relative to the magnetic tape.