Tape architecture and a head architecture for a linear tape drive having a reduced actuator stroke
View Patent ↗A tape architecture and a head architecture for a linear tape drive having a reduced actuator stroke is disclosed. In one embodiment, the linear tape drive head assembly includes a top portion having a plurality of write elements and no read elements at a first side and a plurality of read elements and no write elements at a second side opposite of the first side, and a bottom portion laterally offset from the top portion having a plurality of read elements and no write elements at the aforementioned first side and a plurality of write elements and no read elements at the aforementioned second side. The tape is recorded with all the data tracks within each logical band oriented in the same direction.
1. A linear tape drive head assembly comprising:
a top portion having a plurality of write elements and no read elements at a first side and a plurality of read elements and no write elements at a second side opposite of said first side;
a bottom portion having a plurality of write elements and no read elements at said second side and a plurality of read elements and no write elements at said first side opposite of said second side; and
a middle portion having no read or write elements thereon,
wherein said middle portion is approximately an integral multiple between 1 and (x/2−1) times the width of a logical band of an associated tape.
2. The head assembly of claim 1 , wherein each of said plurality of write elements and similarly said plurality of read elements are approximately n, where n is a number of sub-bands within a logical band of an associated tape.
3. The head assembly of claim 1 , wherein said top portion and said bottom portion are each approximately the size of one logical band of an associated tape.
4. The head assembly of claim 1 , further comprising:
a top extension connectively coupled with said top portion of said head assembly; and
a bottom extension connectively coupled with said bottom portion of said head assembly, said top extension and said bottom extension for supporting said the entire width of the tape media regardless of a location of said top portion or said bottom portion of said head assembly.
5. The head assembly of claim 4 wherein the length of each of said top extension and said bottom extension are approximately equal to the width of said associated tape minus the size of said head assembly.
6. A linear tape drive tape architecture comprising:
a first plurality of logical bands, each containing a multiplicity of sub bands, each of which includes a plurality of tracks, each oriented in a first direction;
a second plurality of logical bands next to the first plurality of logical bands, each containing a multiplicity of sub bands, each of which includes a plurality of tracks, each oriented in a second direction opposite of said first direction;
a third plurality of logical bands next to the second plurality of logical bands, each containing a multiplicity of sub bands, each of which includes a plurality of tracks, each oriented in said first direction; and
a fourth plurality of logical bands next to the third plurality of logical bands, each containing a multiplicity of sub bands, each of which includes a plurality of tracks, each oriented in said second direction,
wherein said tape architecture comprises x logical bands, a top half of said x logical bands each comprising data tracks oriented in a first direction and a bottom half of said x logical bands each comprising data tracks oriented in a second, opposite direction.
7. A linear tape drive tape architecture comprising:
a first plurality of logical bands, each containing a multiplicity of sub bands, each of which includes a plurality of tracks, each oriented in a first direction;
a second plurality of logical bands next to the first plurality of logical bands, each containing a multiplicity of sub bands, each of which includes a plurality of tracks, each oriented in a second direction opposite of said first direction;
a third plurality of logical bands next to the second plurality of logical bands, each containing a multiplicity of sub bands, each of which includes a plurality of tracks, each oriented in said first direction; and
a fourth plurality of logical bands next to the third plurality of logical bands, each containing a multiplicity of sub bands, each of which includes a plurality of tracks, each oriented in said second direction,
wherein said tape architecture comprises x logical bands oriented in an alternating topography such that a first of said x logical bands is oriented in a first direction and a next of said x logical bands is said oriented in a second, opposite direction, said pattern repeating for all of said x logical bands on said tape.
8. A linear tape drive tape architecture comprising:
a first plurality of logical bands, each containing a multiplicity of sub bands, each of which includes a plurality of tracks, each oriented in a first direction;
a second plurality of logical bands next to the first plurality of logical bands, each containing a multiplicity of sub bands, each of which includes a plurality of tracks, each oriented in a second direction opposite of said first direction;
a third plurality of logical bands next to the second plurality of logical bands, each containing a multiplicity of sub bands, each of which includes a plurality of tracks, each oriented in said first direction; and
a fourth plurality of logical bands next to the third plurality of logical bands, each containing a multiplicity of sub bands, each of which includes a plurality of tracks, each oriented in said second direction,
wherein said tape architecture comprises x logical bands in a double alternating topography such that a top two of said x logical bands are each oriented in a first direction and a next two of said x logical bands are oriented in a second, opposite direction, said pattern repeating for all of said x logical bands on said tape.
9. A linear tape drive tape architecture comprising:
a first plurality of logical bands, each containing a multiplicity of sub bands, each of which includes a plurality of tracks, each oriented in a first direction;
a second plurality of logical bands next to the first plurality of logical bands, each containing a multiplicity of sub bands, each of which includes a plurality of tracks, each oriented in a second direction opposite of said first direction;
a third plurality of logical bands next to the second plurality of logical bands, each containing a multiplicity of sub bands, each of which includes a plurality of tracks, each oriented in said first direction; and
a fourth plurality of logical bands next to the third plurality of logical bands, each containing a multiplicity of sub bands, each of which includes a plurality of tracks, each oriented in said second direction,
wherein said tape architecture comprises x logical bands in a multiple alternating topography such that a top N of said x logical bands are each oriented in a first direction and a next N of said x logical bands are oriented in a second, opposite direction, where N is a factor of x, said pattern repeating for all of said x logical bands on said tape.
10. A linear tape drive tape architecture comprising:
a first plurality of logical bands, each containing a multiplicity of sub bands, each of which includes a plurality of tracks, each oriented in a first direction;
a second plurality of logical bands next to the first plurality of logical bands, each containing a multiplicity of sub bands, each of which includes a plurality of tracks, each oriented in a second direction opposite of said first direction;
a third plurality of logical bands next to the second plurality of logical bands, each containing a multiplicity of sub bands, each of which includes a plurality of tracks, each oriented in said first direction; and
a fourth plurality of logical bands next to the third plurality of logical bands, each containing a multiplicity of sub bands, each of which includes a plurality of tracks, each oriented in said second direction,
wherein said tape architecture comprises x logical bands in a multiple alternating topography such that a top N of said x logical bands are each oriented in a first direction and a next N of said x logical bands are oriented in a second, opposite direction, where N is approximately equal to x/2, said pattern repeating for all of said x logical bands on said tape.
11. A linear tape drive having a reduced actuator stroke, said linear tape drive comprising:
a head having a first side and a second side opposite to each other, the head comprising:
a top portion having a plurality of write elements and no read elements at said first side of the head and a plurality of read elements and no write elements at said second side of the head;
a middle portion having no read or write elements thereon; and
a bottom portion having a plurality of write elements and no read elements at said second side of the head and a plurality of read elements and no write elements at said first side of the head;
a drive reel configured for engaging a tape and, during operation, rotatably spooling said tape such that said tape passes longitudinally in proximity to said head;
an actuator for laterally positioning said head with respect to a target position on said tape in said tape drive; and
a tape architecture comprising:
a plurality of first logical bands comprising a plurality of first sub bands comprising a plurality of tracks oriented in a first direction; and
a plurality of second logical bands comprising a plurality of second sub bands comprising a plurality of tracks oriented in a second direction; and
said head oriented with respect to said tape architecture such that said top portion of said head is utilized for reading and writing to any of said plurality of said first logical bands and said bottom portion of said head is utilized for reading and writing to any of said plurality of said second logical bands,
wherein said tape comprises x logical bands, with half of said x logical bands each comprising tracks oriented in a first direction and a second half of said x logical bands each comprising tracks oriented in a second direction, with N logical bands at the top of the tape oriented in the first direction, the next N logical bands oriented in the second direction, such groups of N logical bands alternating across the entire width of the tape, with N a factor of x.
12. The linear tape drive of claim 11 , wherein each of said plurality of write elements and similarly said plurality of read elements at both said top portion and said bottom portion are approximately n, where n is a number of either said first sub bands within said first logical band or said second sub-bands within said second logical band.
13. A linear tape drive having a reduced actuator stroke, said linear tape drive comprising:
a head having a first side and a second side opposite to each other, the head comprising:
a top portion having a plurality of write elements and no read elements at said first side of the head and a plurality of read elements and no write elements at said second side of the head;
a middle portion having no read or write elements thereon; and
a bottom portion having a plurality of write elements and no read elements at said second side of the head and a plurality of read elements and no write elements at said first side of the head;
a drive reel configured for engaging a tape and, during operation, rotatably spooling said tape such that said tape passes longitudinally in proximity to said head;
an actuator for laterally positioning said head with respect to a target position on said tape in said tape drive; and
a tape architecture comprising:
a plurality of first logical bands comprising a plurality of first sub bands comprising a plurality of tracks oriented in a first direction; and
a plurality of second logical bands comprising a plurality of second sub bands comprising a plurality of tracks oriented in a second direction; and
said head oriented with respect to said tape architecture such that said top portion of said head is utilized for reading and writing to any of said plurality of said first logical bands and said bottom portion of said head is utilized for reading and writing to any of said plurality of said second logical bands,
wherein said tape comprises x logical bands, with half of said x logical bands each comprising tracks oriented in a first direction and a second half of said x logical bands each comprising tracks oriented in a second direction, with N logical bands at the top of the tape oriented in the first direction, the next N logical bands oriented in the second direction, such groups of N logical bands alternating across the entire width of the tape, with N approximately equal to x/2.
14. A linear tape drive having a reduced actuator stroke, said linear tape drive comprising:
a head comprising:
a top portion having a plurality of write elements and no read elements at a first side and a plurality of read elements and no write elements at a second side opposite of said first side;
a middle portion having no read or write elements thereon; and
a bottom portion having a plurality of write elements and no read elements at said second side and a plurality of read elements and no write elements at said first side opposite of said second side;
a drive reel configured for engaging a tape and, during operation, rotatably spooling said tape such that said tape passes longitudinally in proximity to said head;
an actuator for laterally positioning said head with respect to a target position on said tape in said tape drive; and
a tape architecture comprising:
a plurality of first logical bands comprising a plurality of first sub bands comprising a plurality of tracks oriented in a first direction; and
a plurality of second logical bands comprising a plurality of second sub bands comprising a plurality of tracks oriented in a second direction; and
said head oriented with respect to said tape architecture such that said top portion of said head is utilized for reading and writing to any of said plurality of said first logical bands and said bottom portion of said head is utilized for reading and writing to any of said plurality of said second logical bands,
wherein said tape comprises x logical bands, with half of said x logical bands each comprising tracks oriented in a first direction and a second half of said x logical bands each comprising tracks oriented in a second direction, with N logical bands at the top of the tape oriented in the first direction, the next N logical bands oriented in the second direction, such groups of N logical bands alternating across the entire width of the tape, with N a factor of x; and
wherein said head size is approximately (N+1)/x times the width of said tape, where x is said total number of logical bands on said tape.
15. The linear tape drive of claim 14 further comprising: a top extension connectively coupled with said top portion of said head; and a bottom extension connectively coupled with said bottom portion of said head, wherein a length of each of said top extension and said bottom extension is approximately (x−(N+1))/x times the width of said tape, where x is said total number of logical bands on said tape.
16. The linear tape drive of claim 15 wherein a total length of said head and said top extension and said bottom extension is approximately (2*x−(N+1))/x times the width of said tape, where x is said total number of logical bands on said tape.
17. A linear tape drive having a reduced actuator stroke, said linear tape drive comprising:
a head comprising:
a top portion having a plurality of write elements and no read elements at a first side and a plurality of read elements and no write elements at a second side opposite of said first side;
a middle portion having no read or write elements thereon; and
a bottom portion having a plurality of write elements and no read elements at said second side and a plurality of read elements and no write elements at said first side opposite of said second side;
a drive reel configured for engaging a tape and, during operation, rotatably spooling said tape such that said tape passes longitudinally in proximity to said head;
an actuator for laterally positioning said head with respect to a target position on said tape in said tape drive; and
a tape architecture comprising:
a plurality of first logical bands comprising a plurality of first sub bands comprising a plurality of tracks oriented in a first direction; and
a plurality of second logical bands comprising a plurality of second sub bands comprising a plurality of tracks oriented in a second direction; and
said head oriented with respect to said tape architecture such that said top portion of said head is utilized for reading and writing to any of said plurality of said first logical bands and said bottom portion of said head is utilized for reading and writing to any of said plurality of said second logical bands,
wherein said tape comprises x logical bands, with half of said x logical bands each comprising tracks oriented in a first direction and a second half of said x logical bands each comprising tracks oriented in a second direction, with N logical bands at the top of the tape oriented in the first direction, the next N logical bands oriented in the second direction, such groups of N logical bands alternating across the entire width of the tape, with N a factor of x; and
wherein said stroke of said head actuator is approximately (x−(N+1))/x times the width of said tape, where x is said total number of logical bands on said tape.