Tape head surface with non-uniform cross-width edge profiles

Abstract

A tape head having offset transducer spans between adjacent modules of the tape head that serves to maintain the balance between debris removal and reduced magnetic layer/recording device spacing on the one hand and reduced tape/tape head friction on the other hand. In one aspect, opposite edges of each module are relatively sharper adjacent the transducer span and relatively rounded (e.g., less sharp) away from the transducer span. The sharp edges reduce magnetic spacing loss and scrape debris off of the tape while the rounded edges reduce or eliminate contact between the tape and the head in regions where no transducer spans are present and thus where no tape writing or reading would be taking place.

Claims

1. A method of operating a tape drive, comprising: first moving a tape over a first module of a tape head, wherein the first moving includes: passing a first track of the tape over a span of transducers of the first module; passing the first track of the tape over a first edge portion of the first module; and passing a second track of the tape over a second edge portion of the first module, wherein the second track of the tape is spaced from the first track of the tape along a reference line that is perpendicular to first and second opposite lateral edges of the tape, and wherein the first edge portion of the first module is sharper than the second edge portion of the first module; and second moving the tape over a second module of the tape head, wherein the second moving includes: passing the second track of the tape over a first edge portion of the second module; passing the second track of the tape over a span of transducers of the second module; and passing the first track of the tape over a second edge portion of the second module, wherein the first edge portion of the second module is sharper than the second edge portion of the second module.

2. The method of claim 1, wherein the first and second portions of the tape are respectively passed over the first and second edge portions of the first module substantially simultaneously, and wherein the first and second portions of the tape are respectively passed over the second and first edge portions of the second module substantially simultaneously.

3. The method of claim 1, wherein the first moving includes: passing the first portion of the tape over a third edge portion of the first module, wherein the third edge portion of the first module is opposite the first edge portion of the first module and wherein the third edge portion is sharper than the second edge portion; and passing the second portion of the tape over a fourth edge portion of the first module, wherein the fourth edge portion of the first module is opposite the second edge portion of the first module.

4. The method of claim 1, wherein the first edge portion of the first module extends along at least an entirety of a length of the span of transducers of the first module.

5. The method of claim 4, wherein the first edge portion of the second module extends along at least an entirety of a length of the span of transducers of the second module.

6. The method of claim 1, wherein each of the first and second edge portions of the first and second modules extends perpendicularly to a direction of motion of the tape during the first and second moving steps.

7. A method of operating a tape drive, comprising: first moving a tape over a first module of a tape head, wherein the first moving includes: passing a first track of the tape over a first edge portion of the first module; passing a second track of the tape over a second edge portion of the first module, wherein the second track of the tape is spaced from the first track of the tape along a reference line that is perpendicular to first and second opposite lateral edges of the tape, and wherein the first edge portion of the first module is sharper than the second edge portion of the first module; and passing the first track of the tape over a span of transducers of the first module; and second moving the tape over a second module of the tape head, wherein the second moving includes: passing the second track of the tape over a first edge portion of the second module; passing the second track of the tape over a span of transducers of the second module; and passing the first track of the tape over a second edge portion of the second module, wherein the first edge portion of the second module is sharper than the second edge portion of the second module.

8. The method of claim 7, wherein the first and second portions of the tape are respectively passed over the first and second edge portions of the first module substantially simultaneously, and wherein the first and second portions of the tape are respectively passed over the second and first edge portions of the second module substantially simultaneously.

9. The method of claim 7, wherein the first edge portion of the first module extends along at least an entirety of a length of the span of transducers of the first module.

10. The method of claim 9, wherein the first edge portion of the second module extends along at least an entirety of a length of the span of transducers of the second module.

11. The method of claim 7, wherein the first moving further includes: passing the first track of the tape over a third edge portion of the first module, wherein the third edge portion of the first module is opposite the first edge portion of the first module; and passing the second track of the tape over a fourth edge portion of the first module, wherein the fourth edge portion of the first module is opposite the second edge portion of the first module.

12. The method of claim 11, wherein the span of transducers of the first module is positioned between the first and third edge portions of the first module.

13. The method of claim 11, wherein the third edge portion of the first module is sharper than the second and fourth edge portions of the first module.

14. The method of claim 11, wherein the second moving further includes: passing the first track of the tape over a third edge portion of the second module, wherein the third edge portion of the second module is opposite the first edge portion of the second module; and passing the second track of the tape over a fourth edge portion of the second module, wherein the fourth edge portion of the second module is opposite the second edge portion of the second module.

15. The method of claim 14, wherein the span of transducers of the second module is positioned between the first and third edge portions of the second module.

16. The method of claim 14, wherein the third edge portion of the second module is sharper than the second and fourth edge portions of the second module.

17. The method of claim 7, wherein each of the first and second edge portions of the first and second modules extends perpendicularly to a direction of motion of the tape during the first and second moving steps.

18. A method of operating a tape drive, comprising: first moving a tape over a first module of a tape head, wherein the first moving includes: passing a first track of the tape over a span of transducers of the first module; passing the first track of the tape over a first edge portion of the first module; and passing a second track of the tape over a second edge portion of the first module, wherein the second track of the tape is spaced from the first track of the tape along a reference line that is perpendicular to first and second opposite lateral edges of the tape, and wherein the first edge portion of the first module is sharper than the second edge portion of the first module; and second moving the tape over a second module of the tape head, wherein the second moving includes: passing the second track of the tape over a first edge portion of the second module; passing the first track of the tape over a second edge portion of the second module, wherein the first edge portion of the second module is sharper than the second edge portion of the second module; passing the second track of the tape over a span of transducers of the second module; passing the second track of the tape over a third edge portion of the second module, wherein the third edge portion of the second module is opposite the first edge portion of the second module; and passing the first track of the tape over a fourth edge portion of the second module, wherein the fourth edge portion of the second module is opposite the second edge portion of the second module.

19. The method of claim 18, wherein the span of transducers of the second module is positioned between the first and third edge portions of the second module.

20. The method of claim 18, wherein each of the first and second edge portions of the first and second modules extends perpendicularly to a direction of motion of the tape during the first and second moving steps.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 is a schematic view of an exemplary tape drive that may be adapted to implement the various utilities disclosed herein.

(2) FIG. 2a is a simplified schematic plan view of a tape head of a tape drive according to an embodiment.

(3) FIG. 2b is a sectional view (along A-A) of the plan view of FIG. 2a.

(4) FIG. 2c is another sectional view (along B-B) of the plan view of FIG. 2a.

(5) FIG. 3 is a perspective view of the tape head of FIGS. 2a-2c.

(6) FIG. 4a is a simplified schematic plan view of a tape head of a tape drive according to another embodiment.

(7) FIG. 4b is a sectional view of the plan view of FIG. 4a.

(8) FIG. 4c is another sectional view of the plan view of FIG. 4a.

DETAILED DESCRIPTION

(9) Disclosed herein are utilities (e.g., apparatuses, systems, methods, etc.) for maintaining the delicate balance between reduced magnetic layer/transducer spacing and tape debris removal on the one hand and reduced tape/tape head friction on the other hand during movement of a magnetic tape over a tape head having adjacent modules with offset transducer spans. In one aspect, opposite edges of each module are relatively sharper adjacent the transducer span and relatively rounded (e.g., less sharp) away from the transducer span. The sharp edges reduce magnetic spacing loss and scrape debris off of the tape while the rounded edges reduce or eliminate contact between the tape and the head in regions where no transducer spans are present and thus where no tape writing or reading would be taking place.

(10) Before discussing the disclosed utilities in more detail, reference is initially made to FIG. 1 which presents a schematic view of an exemplary tape drive 10 and a magnetic tape cartridge 11 that may be adapted to implement the various utilities disclosed herein (although it is to be understood that numerous other forms of tape drives may be used to implement the disclosed utilities, such as single reel tape drives, dual reel cartridges, and the like). The magnetic tape cartridge 11 in FIG. 1 includes a length of magnetic tape 14 (e.g., magnetic tape pack, magnetic tape media) wound on at least one reel 15. The tape drive 10 may include one or more controllers 18 of a recording system for operating the tape drive 10 in accordance with commands received from a host system 20 received at an interface 21. The tape drive 10 may be coupled to the host system 20 in a number of manners such as directly, through a library, or over a network (e.g., via Small Computer Systems Interface (SCSI), Fibre Channel Interface, and the like). The tape drive 10 may be a standalone unit or form part of a tape library or other subsystem.

(11) The magnetic tape cartridge 11 may be inserted into the tape drive 10 and loaded by the tape drive 10 so that the tape 14 winds around a reel 16 of the tape drive 10 and so that at least one tape head assembly 23 of the recording system (e.g., each including one or more tape heads, tape guides, or the like) reads and/or writes information with respect to the tape 14 as the tape 14 is moved longitudinally in first/forward and/or second/reverse opposed directions past the tape head assembly 23 along a course by one or more motors 25. For instance, each tape head may include one or more tape head modules, where each module includes a plurality (e.g., span) of read elements, write elements, and/or servo elements for use in respectively reading data from the tape 14, writing data to the tape 14, and maintaining precise control of the tape head assembly 23 with respect to the tape 14.

(12) The tape 14 may include a plurality of parallel data tracks that may be read and/or written by the at least one tape head of the tape head assembly 23. In some formats, the tracks may be written and/or read in a serpentine, back and forth manner; in a spiral-in manner; and the like. The recording system may include a servo control or tracking system 27 to electronically switch from one tape head to another tape head assembly 23; to seek and move a tape head assembly 23 laterally relative to the tape 14 (e.g., perpendicular to a direction of movement or course of the tape 14); to position the a tape head at a desired location over the tape 14 and/or one or more tracks of the tape 14; to follow one or more desired tracks; and/or the like. The servo control system 27 may also control the operation of the motors 25 through motor drivers 28 in response to instructions by the one or more controllers 18, where the controllers 18 may provide the data flow and formatting of data to be read from and written to the magnetic tape 14 (e.g., via employing a buffer 30 and a recording channel 32). The various components of the tape drive 10 may be incorporated or otherwise embodied within any appropriate housing (not shown).

(13) FIGS. 2a-2c and 3 present various views of a tape head 100 (e.g., part of tape head assembly 23 of FIG. 1) for use in writing data to and/or reading data from a length of magnetic tape 200 (e.g., tape 14 of FIG. 1) that is operable to move in opposite first and second directions 212, 216 along a course or path over the tape head 100 according to one embodiment. Broadly, the tape head 100 may include at least first and second tape head modules 104.sub.1, 104.sub.2 that each include a span (e.g., such as 16, 32, etc.) of elements (e.g., read, write, and/or servo read transducers) 106 such as first and second sets 106.sub.1, 106.sub.2 of elements on upper surfaces 116.sub.1, 116.sub.2 thereof. Each span 106 of elements may be appropriately disposed on a bump of the respective tape head module 104 and may include one or more servo read elements (not shown) that are configured to read corresponding servo patterns (not shown) on the surface of the tape 200.

(14) Any appropriate servo control system (e.g., servo control system 27 of FIG. 1) may utilize information received from the servo read elements as the servo read elements are reading the servo patterns for purposes of maintaining alignment of the read and write elements over desired locations or positions on the tape 200. In addition to one or more tape head modules 104, the tape head 100 may also include one or more tape guides (e.g., outriggers, etc., not shown) over which the tape 200 is configured to pass for purposes of supporting the entire width of the tape 200, presenting the tape 200 to the tape head modules 104 with an appropriate contact angle to maintain appropriate contact pressure between the tape 200 and the tape head modules 104, and the like. Numerous additional components of the tape head 100 have been omitted from the drawings and this discussion in the interest of clarity.

(15) As shown, the span 106.sub.1 of elements of the first module 104.sub.1 is at least partially offset from or non-overlapping with the span 106.sub.2 of elements of the second module 104.sub.2 along a cross-width 112 (e.g., length) of the tape head 100 (i.e., in a direction perpendicular to the first and second directions of travel 212, 216 of the tape 200). In this regard, a particular portion (e.g., track) of the tape 200 that passes over the span 106.sub.1 of elements of the first module 104.sub.1 in one of the first and second directions 212, 216 does not then necessarily pass over the span 106.sub.2 of elements of the second module 104.sub.2 with the tape moving in the one of the first and second directions 212, 216. This arrangement allows for different reading and/or writing operations to be performed (e.g., by controller 18, servo control system 27, motor drivers 28, etc. of tape drive 10 of FIG. 1) on separate first and second portions (e.g., different tracks or different sets of tracks) of the tape 200 that are separated along a reference line or direction that is perpendicular to first and second opposite lateral edges 204, 208 of the tape 200 (e.g., along the cross-width 112 of the tape head 100).

(16) Furthermore, the upper surfaces 116.sub.1, 116.sub.2 of the first and second modules 104.sub.1, 104.sub.2 may include at least first edge portions 132.sub.1, 132.sub.2 in respective regions of first edges 124.sub.1, 124.sub.2 thereof that are aligned with the spans 106.sub.1, 106.sub.2 (e.g., that overlap in the cross width 112 direction). The first edge portions 132.sub.1, 132.sub.2 are configured to scrape air entrained by the moving tape 200 to reduce the spacing between the magnetic layer of the tape 200 and the spans 106.sub.1, 106.sub.2 of elements and thereby facilitate accurate reading and/or writing operations on the tape 200. In this regard, each of the first edge portions 132.sub.1, 132.sub.2 may have a profile that is relatively sharp or pointed (e.g., a radius of curvature of not greater than about 0.1 mm). The upper surfaces 116.sub.1, 116.sub.2 of the first and second modules 104.sub.1, 104.sub.2 may also include first edge portions 136.sub.1, 136.sub.2 on second edges 128.sub.1, 128.sub.2 thereof (e.g., opposite and/or parallel to the first edges 124.sub.1, 124.sub.2) that are aligned with the spans 106.sub.1, 106.sub.2 (e.g., that overlap in the cross width 112 direction) and that have relatively sharp or pointed profiles (e.g., for air scraping). In one arrangement, the first edge portions 132.sub.1/136.sub.1, 132.sub.2/136.sub.2 of each of the first and second modules 104.sub.1, 104.sub.2 may have a length that is at least as long as a length of the spans 106.sub.1, 106.sub.2 of elements, such as at least twice as long, or at least four times as long.

(17) As discussed previously, close contact between the tape head 100 and portions of the tape 100 not being read or written to by the spans 106.sub.1, 106.sub.2 of elements unnecessarily increases friction between the tape head 100 and these portions and can create complications with the precise control of the lateral position of the tape head 100 relative to the tape 200, among other inefficiencies. In this regard, another region of the first edge 124.sub.1 of the first module 104.sub.1 includes at least a second edge portion 140.sub.1 that is offset from or otherwise non-overlapping with the first edge portion 132.sub.1 (as well as with the span 106.sub.1 of transducers of the first module 104.sub.1) and that has a profile that is less sharp or otherwise softer than that of the first edge portions 132.sub.1/136.sub.1, 132.sub.2/136.sub.2 (e.g., a radius of curvature of at least about 0.2 mm), such as via rounding, curving, etc. such edge portions in any appropriate manner. Also, another region of the first edge 124.sub.2 of the second module 104.sub.2 includes at least a second edge portion 140.sub.2 that is offset from or otherwise non-overlapping with the first edge portion 132.sub.2 (as well as with the span 106.sub.2 of transducers of the second module 104.sub.2) and that has a profile that is less sharp or otherwise softer than that of the first edge portions 132.sub.1/136.sub.1, 132.sub.2/136.sub.2 (e.g., such as via rounding, curving, etc. such edge portions in any appropriate manner). Similarly, respective regions of the second edges 128.sub.1, 128.sub.2 of the first and second modules 104.sub.1, 104.sub.2 may include second edge portions 144.sub.1, 144.sub.2 that are opposite the second edge portions 140.sub.1, 140.sub.2 of the first edges 124.sub.1, 124.sub.2 and that also have profiles that are less sharp or otherwise softer than those of the first edge portions 132.sub.1/136.sub.1, 132.sub.2/136.sub.2.

(18) In operation, for instance, a first portion of the tape 200 (e.g., first set of tracks) moving in the second direction 216 may pass over the first edge portion 136.sub.1 of the second edge 128.sub.1 of the first module 104.sub.1, continue in close contact with the upper surface 116.sub.1 and the span 106.sub.1 of transducers (e.g., where reading of and/or writing to the first portion of the tape 200 by the span 106.sub.1 may occur), and then pass over the first edge portion 132.sub.1 of the first edge 124.sub.1 of the first module 104.sub.1 (where the first edge portions 132.sub.1/136.sub.1 scrape air to closely position the magnetic layer of the tape 200 adjacent the first portion of the tape 200 close to the span 106.sub.1 of transducers). In contrast, a second portion of the tape 200 (e.g., second set of tracks spaced from the first portion along the cross width 112), also moving in the second direction 216 simultaneously with the first portion, may pass over the second edge portion 144.sub.1 of the second edge 128.sub.1 of the first module 104.sub.1, continue over the upper surface 116.sub.1, and then pass over the second edge portion 140.sub.1 of the first edge 124.sub.1 of the first module 104.sub.1 (where the second edge portions 140.sub.1/144.sub.1 create air layers between the upper surface 116.sub.1 adjacent the second portion of the tape 200 that reduce friction between the second portion and the upper surface 116.sub.1). See FIGS. 2a and 3.

(19) Continuing with the tape 200 moving in the second direction 216, the first portion of the tape 200 may then pass over the second edge portion 140.sub.2 of the first edge 124.sub.2 of the second module 104.sub.2, continue over the upper surface 116.sub.2, and then pass over the second edge portion 144.sub.2 of the second edge 128.sub.2 of the second module 104.sub.2 (where the second edge portions 140.sub.2/144.sub.2 create air layers between the upper surface 116.sub.2 adjacent the first portion of the tape 200 that reduce friction between the first portion and the upper surface 116.sub.2). Conversely, the second portion of the tape 200 may, simultaneously with the first portion of the tape 200 passing over the second edge portions 140.sub.2/144.sub.2 and the upper surface 116.sub.2, pass over the first edge portion 132.sub.2 of the first edge 124.sub.2 of the second module 104.sub.2, continue in close contact with the upper surface 116.sub.2 and the span 106.sub.2 of transducers (e.g., where reading of and/or writing to the second portion of the tape 200 by the span 106.sub.2 may occur), and then pass over the first edge portion 136.sub.2 of the second edge 128.sub.2 of the second module 104.sub.2 (where the first edge portions 132.sub.2/136.sub.2 scrape air to closely position the magnetic layer of the tape 200 adjacent the second portion of the tape 200 close to the span 106.sub.2 of transducers). The first and second spaced portions of the tape 200 may pass over and/or contact the first and second modules 104.sub.1, 104.sub.2 in a vice versa manner from that described above when the tape 200 travels in the first direction 212.

(20) While each of the first and second edges 124.sub.1/128.sub.1, 124.sub.2/128.sub.2 of the first and second modules 104.sub.1, 104.sub.2 has been described as including at least first and second edge portions (where the first edge portions overlap the respective spans and are relatively sharp and where the second edge portions are offset from the spans and are less sharp than the first edge portions), additional edge portions may be included. For instance, and as shown in FIGS. 2a and 3, the first and second edges 124.sub.1/128.sub.1, 124.sub.2/128.sub.2 of the first and second modules 104.sub.1/104.sub.2 may include third edge portions 148.sub.1/152.sub.1, 148.sub.2/152.sub.2 disposed opposite the second edge portions 140.sub.1/144.sub.1, 140.sub.2/144.sub.2 (e.g., on an opposite side of the respective spans 106.sub.1/106.sub.2) and that also have a profile that is less sharp than that of the first edge portions 132.sub.1/136.sub.1, 132.sub.2/136.sub.2 (e.g., such as via rounding, tapering, curving, etc.). It can be seen how this arrangement advantageously reduces friction between the tape head 100 and outer portions of the tape 200 (e.g., near first and second lateral edges 204, 208) that are not being written to and/or read by the spans 106.sub.1/106.sub.2 (e.g., depending upon a particular lateral position of the tape head 100 relative to the tape 200 in the cross width 112 direction)

(21) The rounding or curving of the second and third edges portions of the first and second modules 104.sub.1, 104.sub.2 may be of any particular degree appropriate to induce the creation of air layers between the portions of the tape 200 traveling thereover in one of the first and second directions 212, 216 for corresponding friction reduction. In one arrangement, for instance, the rounded or curved profiles of one or more of the second and third edge portions of the first and second modules 104.sub.1, 104.sub.2 may extend up to about half of a land length 156.sub.1, 156.sub.2 of the upper surfaces 116.sub.1, 116.sub.2 of the first and second modules 104.sub.1, 104.sub.2. See FIG. 2a. However, lesser degrees of curving or rounding that are also configured to reduce friction between the tape 200 and the tape head 100 are also envisioned and encompassed in the present disclosure.

(22) FIGS. 4a-4c present another embodiment of a tape head 100 for use in writing data to and/or reading data from a length of magnetic tape 200. In this embodiment, the first edge portions 136.sub.1, 136.sub.2 of the second edges 128.sub.1, 128.sub.2 of the first and second modules 104.sub.1, 104.sub.2 extend a substantial entirety of the length of the second edges 128.sub.1, 128.sub.2. In this regard, a substantial entirety of the width of the tape 200 between the first and second lateral edges 204, 208 may be scraped or cleaned of debris by the first edge portions 136.sub.1, 136.sub.2 with the tape 200 moving in either of the first or second directions 212, 216. Furthermore, friction reductions may still result from implementation of the second and third edge portions 140.sub.1/148.sub.1, 140.sub.2/148.sub.2 of the first edges 124.sub.1, 124.sub.2 of the first and second modules 104.sub.1, 104.sub.2.

(23) While only two respective offset spans 106.sub.1, 106.sub.2 of transducers on the first and second modules 104.sub.1, 104.sub.2 have been shown in the figures, it is to be understood that the teachings presented herein may also apply to various more complicated arrangements of offset transducer spans. With reference to FIG. 2a, for instance, assume the first module 104.sub.1 includes a second span of transducers spaced from the span 106.sub.1 along the cross width 112 direction, such as across from third edge portion 148.sub.2 of second module 104.sub.2. In this regard, the portions of second edge portions 140.sub.1/144.sub.1 that are aligned with and overlap the second span (along the cross width 112) may be relatively sharp for scraping air and thereby positioning the magnetic layer of the tape 200 close to the second span as the tape 200 moves in one of the first and second directions 212, 216.

(24) In one arrangement, the first and second modules 104.sub.1, 104.sub.2 may have a plurality of alternating offset spans of transducers (e.g., 4, 6, 8, etc.). In this arrangement, opposite edge portions of the first and second edges 124.sub.1/128.sub.1, 124.sub.2/128.sub.2 of the first and second modules 104.sub.1, 104.sub.2 that surround and overlap (along the cross width 112) each respective span of one of the first and second modules 104.sub.1, 104.sub.2 may be relatively sharp (e.g., like first edge portions 132.sub.1/136.sub.1, 132.sub.2/136.sub.2) while corresponding opposite edge portions of the other of the first and second modules 104.sub.1, 104.sub.2 may be less sharp (e.g., such as portions of second edge portions 140.sub.2, 144.sub.2 of second module 104.sub.2 across from first edge portions 132.sub.1/136.sub.1 of first module 104.sub.1, and/or the like).

(25) In one arrangement, and as shown in the figures, the relatively sharp opposite edge portions surrounding each respective span of transducers of one of the first and second modules 104.sub.1, 104.sub.2 may be fully offset from (e.g., non-overlapping with) the relatively sharp opposite edge portions surrounding an adjacent span of the other of the first and second modules 104.sub.1, 104.sub.2 along the cross width 112 direction (e.g., along a direction that is perpendicular to the first and second directions of travel 212, 216 of the tape 200, compare first edge portions 132.sub.1/136.sub.1 of span 106.sub.1 of first module 104.sub.1 and first edge portions 132.sub.2/136.sub.2 of span 106.sub.2 of second module 104.sub.2). In another arrangement, the relatively sharp opposite edge portions surrounding each respective span of transducers may only be partially offset from (e.g., may be partially but not fully overlapping with) those of an adjacent span of the other module. In a further arrangement, one or more transition regions between sharp and non-sharp edge portions may be appropriately rounded or tapered to limit damage to tape 200 moving thereover. With reference to FIG. 3, for instance, the pointed corners and/or short edges between first edge portion 132.sub.1 and each of second and third edge portions 140.sub.1, 148.sub.1 of first edge 124.sub.1 of first module 104.sub.1 may be appropriately smoothed, polished or the like to limit damage to tape 200 traveling thereover.

(26) It will be readily appreciated that many additions and/or deviations may be made from the specific embodiments disclosed in the specification without departing from the spirit and scope of the invention and that the illustrations and discussion herein has only been provided to assist the reader in understanding the various aspects of the present disclosure. The various uses of first, second, etc. (e.g., first edge portion, second edge portion, third edge portion, etc.) have, unless otherwise specified herein, merely been used to facilitate the reader's understanding of the disclosed embodiments and do not necessarily connote any specific order of components. For instance, it is noted in FIG. 3 how reference numerals 132.sub.1 and 140.sub.1 have been respectively referred to previously as the first and second edge portions of the first edge 124.sub.1 of the first module 104.sub.1, and the reference numerals 136.sub.1 and 144.sub.1 have been respectively referred to previously as the first and second edge portions of the second edge 128.sub.1 of the first module 104.sub.1. However, the reference numerals 132.sub.1, 140.sub.1, and 136.sub.1 could also be referred to as the first edge portion, second edge portion, and third edge portion, respectively, of the first module 104.sub.1 as a whole. Furthermore, one or more various combinations of the above discussed arrangements and embodiments are also envisioned. Still further, the figures presented herein are not necessarily drawn to scale.

(27) The tape drive 10 may be operated to read data from and/or write data to the tape 14 (e.g., tape 200) by one or more computer program products, i.e., one or more modules of computer program instructions encoded on a computer-readable medium for execution by, or to control the operation of, data processing apparatus (one or more processors). The computer-readable medium can be a machine-readable storage device, a machine-readable storage substrate, a non-volatile memory device, a composition of matter affecting a machine-readable propagated signal, or a combination of one or more of them. In this regard, the host 20, tape drive 10, and the like may encompass one or more apparatuses, devices, and machines for processing data, including by way of example a programmable processor, a computer, or multiple processors or computers. In addition to hardware, the host 20, tape drive 10, and the like may include code that creates an execution environment for the computer program in question, e.g., code that constitutes processor firmware, a protocol stack, a database management system, an operating system, or a combination of one or more of them.

(28) While this specification contains many specifics, these should not be construed as limitations on the scope of the disclosure or of what may be claimed, but rather as descriptions of features specific to particular embodiments of the disclosure. Furthermore, certain features that are described in this specification in the context of separate embodiments can also be implemented in combination in a single embodiment. Conversely, various features that are described in the context of a single embodiment can also be implemented in multiple embodiments separately or in any suitable subcombination. Moreover, although features may be described above as acting in certain combinations and even initially claimed as such, one or more features from a claimed combination can in some cases be excised from the combination, and the claimed combination may be directed to a subcombination or variation of a subcombination.

(29) The above described embodiments including the preferred embodiment and the best mode of the invention known to the inventor at the time of filing are given by illustrative examples only.