# Patent

## Title
Multiple disc array carrier

## Abstract

A multiple disc array apparatus and associated method are provided having substantially identical first and second partitions that are removably connectable together. Each partition supports a plurality of data storage devices arranged in noncoplanar first and second arrays. Each partition further defines clearance apertures for passing fasteners therethrough for fixing each data storage device to the respective partition.

## Background
RELATED APPLICATIONS
This is a continuation of co-pending U.S. patent application Ser. No. 10/884,605 filed Jul. 2, 2004.


FIELD OF THE INVENTION
The embodiments of the present invention relate generally to the field of array storage systems and more particularly but without limitation to a carrier for convertibly componentizing various numbers and sizes of data storage devices to define a multiple disc array.
BACKGROUND
Ever-increasing demand for data storage capacity has fostered the development of improved data array storage systems wherein a plurality of data storage devices is electronically linked to function synergistically. Data integrity schemes are also enhanced in such arrays permitting fail-safe redundant storage of data, such as in redundant arrays of independent device (“RAID”) systems.
There are a number of challenges facing the array designer. For example, the many and complex mechanical and electrical connections required for each data storage device are multiplied by the number in an array. That is, each and every data storage device requires sufficient mechanical support to isolate the delicate head and disc components from vibration levels that create data transfer errors. Not only must attention be paid to self-excitation, that is, vibration caused by the rotating disc of a data storage device itself, but like attention is required to external excitation sources in such an environment. External excitation can come from other data storage devices in the array, electrical components in the array such as power supplies and fans, and from the installation and/or removal of data storage devices while the array is operational.
As the number of data storage devices in arrays increases, the problems associated with electromagnetic interference containment are exacerbated as well. Properly shielding the data storage devices requires attention paid not only to leak paths between drives in adjacent shelves, but also to the leak paths potentially created by the multiple openings into which each of the plurality of data storage devices is inserted. Adequate shielding of these openings must be provided while still permitting the ability to insert and/or remove a data storage device without disrupting the shielding in place for adjacent data storage devices in the array.
Flexibility can be a problem as well. For instance, traditionally the electrical systems, such as the connector boards, controllers, and connecting buses, are hard-wired for a predetermined number and size of data storage devices in the array. This is required to maintain the electrical integrity of the array while permitting swapping of individual data storage devices. For this reason, the storage shelves and the associated electrical systems are dedicated for the predetermined number and size of data storage devices. Accordingly, because of both mechanical and electrical constraints, an array designed for a particular form factor configuration cannot readily be adapted for use with a different form factor. Also, if a grouping of data storage devices is needed for a particular function, such as mirroring the storage of data, such functionality must conventionally be achieved at the top level host programming level. This requires complex and coordinated programming of many data storage devices.
While various approaches have been proposed in the art to address maximizing the data storage capacity while also providing operable flexibility in the utilization of data storage devices in array storage systems, there nevertheless remains a continued need for improvements in the art. It is to such improvements that the claimed invention is directed.
SUMMARY OF THE INVENTION
In accordance with preferred embodiments of the present invention, an apparatus and method are contemplated for convertibly componentizing data storage devices in a multiple disc array.
In some embodiments a multiple disc array is provided having substantially identical first and second partitions that are removably connectable together. Each partition supports a plurality of data storage devices arranged in noncoplanar first and second arrays. Each partition further defines clearance apertures for passing fasteners therethrough for fixing each data storage device to the respective partition.
In some embodiments a method is provided for fixing a first plurality of data storage devices to a first partition arranged in noncoplanar first and second arrays; fixing a second plurality of data storage devices to a second partition arranged in noncoplanar third and fourth arrays; and joining the first and second partitions together forming a multiple disc array.
In some embodiments a multiple disc array is provided having a plurality of data storage devices, with each having a transducer in a data transfer relationship with a storage medium, and means for supporting the plurality of data storage devices to maximize packing density while minimizing the number of unique supporting members.
These and various other features and advantages which characterize the claimed invention will become apparent upon reading the following detailed description and upon reviewing the associated drawings.



BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is an isometric view of an array storage system constructed in accordance with related art solutions.
FIG. 2 is an isometric view of a data storage device.
FIG. 3 is an isometric view of an array storage system constructed in accordance with embodiments of the present invention.
FIG. 4 is an exploded isometric view of portions of the array storage system of FIG. 3.
FIG. 5 is an exploded isometric view of the carrier portion of FIG. 4.
FIG. 6 is an exploded isometric view of the multiple disc array of FIG. 3.
FIG. 7 is a flow diagram of a method for componentizing a selected number and size of data storage devices as a multiple disc array in accordance with embodiments of the present invention.



DETAILED DESCRIPTION
FIG. 1 is an isometric view of a related art array storage system 100 wherein a cabinet 102 supports a plurality of data storage devices 104. A host 106 is electrically connected to each of the data storage devices 104 so as to provide a bulk data storage arrangement, such as for providing a network interface and/or for employing data integrity schemes such as in a RAID system.
FIG. 2 is an isometric view of a data storage device 104 suited for use with the present invention and in the form of a rotating magnetic media disc drive. A data storage disc 108 is rotated by a motor 110 to present data storage locations of the disc 108 to a read/write head (“head”) 112. The head 112 is supported at the distal end of a rotary actuator 114 that is capable of moving the head 112 radially between inner and outer tracks of the disc 108. The head 112 is electrically connected to a circuit board 116 by way of a flex circuit 118. The circuit board 116 is adapted to receive and send control signals controlling the functions of the data storage device 104. A connector 120 is electrically connected to the circuit board 116, and is adapted for connecting the data storage device 104 with control electronics of the array 100.
The array storage system 100 offers one way of combining the storage capability of a number of data storage devices 104. Disadvantageously, however, the individual openings in the cabinet 102 are sized and wired to receivingly engage either individual data storage devices 104, or a fixed number and size of data storage devices 104.
FIGS. 3 and 4 illustrate an array storage system 200 constructed in accordance with novel embodiments of the present invention, wherein a plurality of multiple disc arrays (“MDA”) 201 are utilized. An MDA 201 generally comprises a convertible plurality of componentized data storage devices 104. By “convertible” it is meant that one or more data storage devices 104 can be readily replaced, added, or removed in an existing MDA 201, or that a different MDA can be utilized that is capable of supporting a different number, size or arrangement of data storage devices. By “componentized” it is meant that the data storage devices 104 and associated control electronics in the MDA 201 are integrated so as to be functionally presented to the array 200 as a single component.
A cabinet 202 defines a plurality of cavities into each of which a shelf 206 is receivingly engaged. Each shelf 206 defines one or more cavities 207 into each of which an MDA 201 is receivingly engaged for engagement with a backplane 209. Similarly, the shelf 206 defines cavities for receivingly engaging other electrical modules with the backplane 209, such as, but not limited to, controllers 211, batteries 213, power supplies 215, and interfaces 217.
In the illustrative embodiment of FIG. 4, the shelf 206 defines two cavities 207 for receiving two MDAs 201. Equivalent alternative embodiments contemplate a different number of MDAs 201 per shelf 206. The array storage system 200 comprises a plurality of MDAs 201, each sized in accordance with the respective cavity 207 for an operable mating relationship. Each MDA 201 is adapted to operably support a variable number, size, or arrangement of data storage devices 104. More particularly, this solution provides an array storage system 200 comprising a shelf 206 for receivingly engaging an MDA 201 comprising a carrier 204 from a plurality of different carriers, each carrier of the plurality having common exterior dimensions defining an operable mating relationship with the cavity 207 of the shelf 206, and each carrier of the plurality differentiated by interior supporting features for supporting a selected number, size, or arrangement of data storage devices 104.
FIG. 5 is an exploded isometric view illustrating embodiments wherein the carrier 204 comprises a pair of identical partitions 208 that are joined together. In this arrangement the joined partitions 208, each supporting a plurality of data storage devices 104, are receivingly engageable within one cavity 207 of the shelf 206 (FIG. 4) which is, in turn, receivingly engageable within the cavity of the cabinet 202 (FIG. 4). In some embodiments of the present invention, the shelf 206 is fixed within the cabinet 202 and the carrier 204 is insertable and removable from the shelf 206 so that individual data storage devices 104 can be readily added, removed or replaced. In other embodiments of the present invention, a carrier 204 can be replaced with another carrier having different data storage device supporting features for electrically connecting a different selected number, size, or arrangement of data storage devices 104 in the shelf 206.
In the illustrative embodiments of FIG. 5 the partition 208 supports a first linear array 212 of three data storage devices 104 and a second linear array 214 of two data storage devices 104. The partition 208 defines a planar support surface 216 and opposing transverse side members 218, 220 defining a channel 222 for receivingly engaging one of the data storage devices 104 therein. Similarly, channels 224, 226 are defined for receivingly engaging the other two data storage devices 104 in the first array 212, and channels 228, 230 are defined for receivingly engaging the data storage devices 104 in the second array 214.
Tab members 232, 234 extend transversely from the distal end of the side member 218 and define attachment points 236, 238, respectively, for fixing the data storage device 104 to the partition 208. In some embodiments the attachment points 236, 238 can comprise a clearance aperture for passing a fastener 240 therethrough for engaging an attachment feature 242 of the data storage device 104. For example, the fasteners 240 can comprise threaded fasteners that threadingly engage threaded openings 242 provided in the data storage device 104. In the illustrative embodiments of FIG. 5 there are four attachment points 236, 238, 244, 246 for fixing each data storage device 104. Positively fixing each of the data storage devices 104 to the partition 208 in this manner advantageously damps vibration created by the rotating discs 108.
It will be noted that the data storage devices 104 in the second array 214 must be flipped, with respect to those in the first array 212, in order for the attachment features 242 to align with the attachment points 236, 238, 244, 246 associated with the channels 228, 230. This causes the data storage devices 104 in the first array 212 to spin oppositely with respect to data storage devices 104 in the second array 214. That is, with respect to a reference axis of rotation 248 that is parallel with the axis of rotation of all data storage devices 104, if the data storage devices 104 in the first array 212 operably rotate in direction 250, then by the flipped relational orientation the data storage devices 104 in the second array 214 will rotate oppositely in direction 252.
This opposite rotation of data storage devices 104 in different arrays 212, 214 reduces vibration in comparison to arrangements where all the data storage devices 104 spin in the same direction. For example, differential rotational vibration is effectively canceled between adjacent, oppositely rotating data storage devices 104 rather than being accumulated by rotating in the same direction.
For illustrative embodiments of FIG. 5, first attachment features 254 are alignable with second attachment features 256 for joining the two partitions 208 together. For example, the first attachment feature 254 can define a clearance aperture for passing a fastener (not shown) therethrough and fixingly engaging the second attachment feature 256.
FIG. 6 illustrates embodiments wherein the two partitions 208 are joined together along a demarcation axis 258 to form the carrier 204. In alternative equivalent embodiments the carrier 204 could comprise only one partition 208. It will be noted that by first fixing all the data storage devices 104 to the respective partitions 208 and then connecting the partitions 208 together that the attachment features 236, 238, 244, 246 are readily accessible for all data storage devices. To maximize the vibration-reducing benefits of the oppositely-spinning data storage devices 104, the arrays 212, 214 are disposed substantially parallel to and mirrored around the demarcation axis 258.
Within the carrier 204, each of the data storage devices 104 has the electrical connector 120 disposed within a coplanar arrangement of all connectors 120 of all the data storage devices 104. The carrier 204 supports a circuit board 260 having a number of connectors 262 arranged to align with the connectors 120 of the respective data storage devices 104. The circuit board 260 preferably further has a connector 264 that is adapted to connect to the electronics of the array storage system 200 via the backplane 209 (FIG. 4). It will be noted that in the illustrative embodiments of FIG. 6, the connector 264 is aligned for an operable insertion connection with the backplane 209 by moving the circuit board 260 in a direction 268 along the longitudinal depth of the shelf 206 (FIG. 4). In this manner, the electrical connection between the circuit board 260 and the array storage system 200 is readily made as a result of inserting the MDA 201 into the shelf 206 (FIG. 4). The circuit board 260 is selectively configured such that upon operative insertion of the carrier 204, the host 106 can be placed in electrical communication with each and every data storage device 104 in the MDA 201, and the data storage devices 104 can be in electrical communication with other data storage devices 104 both inside and outside a particular MDA 201.
The carrier 204 can support a wrapper 270 for enclosing the data storage devices 104 and/or the circuit board 260 for electrical shielding. In the illustrative embodiments of FIG. 6 the wrapper 270 covers just the front and circuit board portions of the MDA 201. The carrier 204 also preferably comprises one or more guide members that are adapted for aligning with mating features in the backplane 209 (FIG. 4) to positively align the MDA 201 during insertion.
FIG. 7 is a flow chart of illustrative steps for a method 300 for supporting a plurality of data storage devices 104 in an MDA 201 in accordance with embodiments of the present invention. The method 300 initially determines the number of data storage devices 104 desired in step 302 and the size of the data storage devices 104 desired in step 304. From these determinations, an appropriately configured carrier 204 can be selected in step 306. It will be noted that the number and size of the supporting channels 222 do not have to exactly match the number of data storage devices 104 desired; rather, a carrier 204 with currently unused channels 222 can be used in future expansion of capacity by adding more data storage devices 104 in the same carrier 204.
The data storage devices 104 are inserted into the carrier 204 in step 308. The insertion step comprises fixing a first data storage device 104 to the partition 208, and fixing a second data storage device 104 to the partition 208 in an orientation establishing an opposite direction of disc 108 rotation with respect to the first data storage device 104. In some embodiments the insertion step further comprises fixing a third data storage device 104 to another identical partition 208 and connecting the partitions 208 together. The carrier 204 is then inserted into the shelf 206.
Decision step 312 determines whether any presently employed data storage devices 104 need to be changed, such as for maintenance, repair, archiving or the like. If yes, then decision block 314 determines whether there is an adequate capacity of supporting channels in the presently used carrier 204. If yes, such as when one data storage device 104 is being replaced with an identical one, then in step 316 the carrier 204 is removed from the shelf 206 and one or more data storage devices 104 are removed from the carrier 204. The method then returns to step 308 where one or more data storage devices 104 are inserted into the carrier 204.
If the determination of step 314 is no, then a differently configured carrier is needed. The method returns to step 302 and 304 which define the appropriate carrier, and the method returns to the providing the carrier step 306.
Summarizing, a carrier (such as 204) is used for componentizing a number of data storage devices (such as 104) in an MDA (such as 201). The carrier is unitarily removable and insertable in a shelf (such as 206) of an array storage system (such as 200). The carrier comprises a partition (such as 208) defining an arrangement of channels (such as 222) for receivingly engaging a data storage device. The number of channels is associated with the selected number of data storage devices, and the size of the channels is associated with the selected size of the data storage devices. The partition further defines attachment points (such as 232) for fixing the data storage device to the partition.
The partition supports a first array (such as 212) of data storage devices and a second array (such as 214) of data storage devices, such that a data storage device in the first array operably spins oppositely with respect to a data storage device in the second array. The carrier can comprise two partitions, each supporting arrays of data storage devices, that are connected together along a demarcation axis (such as 258). The data storage devices can be disposed substantially parallel to and in a mirrored arrangement around the demarcation axis. Preferably, an equivalent number of data storage devices are supported in the partitions.
The data storage devices are supported in the carrier such that an electrical connector (such as 120) of each is disposed within a coplanar arrangement of all the connectors of the data storage devices in the MDA. The carrier supports a circuit board (such as 260) for operatively connecting the selected number of data storage devices in the MDA. A wrapper (such as 270) can enclose the carrier and/or circuit board for electrical shielding.
Embodiments of the present invention contemplate a method for supporting a data storage device in an array storage system. The method comprises providing a carrier (such as 306) from a plurality of different carriers that is insertable in a shelf supported in the array storage system; the carrier defining an arrangement of channels that each supportingly engage a data storage device, wherein the number of channels is associated with a selected number of data storage devices, and wherein the size of each channel is associated with a selected size of the data storage device, and wherein the different carriers have common volumetric dimensions but varying number and/or size of channels. The method further comprises inserting one or more data storage devices in a respective number of channels in the carrier (such as 308). The insertion step comprises fixing a first data storage device to the partition, and fixing a second data storage device to the partition in an orientation establishing an opposite direction of disc rotation with respect to the first data storage device. In some embodiments the insertion step further comprises fixing a third data storage device to another identical partition and connecting the partitions together. The carrier is then inserted into the shelf in step 310.
The method further comprises the replacing of an existing data storage device in the array storage system, by removing the carrier from the shelf and removing a data storage device from the carrier (such as 316), inserting another data storage device in the carrier (such as 308), and inserting the carrier back in the shelf (such as 310). The method of replacing an existing data storage device in the array storage system can furthermore comprise removing the carrier from the shelf, and inserting a different carrier supporting one or more data storage devices in the shelf (such as 302, 304, 306).
Present embodiments contemplate a multiple disc array having a plurality of data storage devices, each having a transducer in a data transfer relationship with a storage medium, and means for supporting the plurality of data storage devices to maximize packing density while minimizing the number of unique supporting members. For purposes of this description and meaning of the appended claims, the term “means for supporting” requires the structure disclosed herein and equivalents thereof that provides closely packed channels that receivingly engage and fixingly support each of the data storage devices for providing maximum packing density of the data storage devices. The term “means for supporting” also requires that the first and second partitions be substantially identical in order to minimize the number of unique parts involved in manufacturing the multiple disc array.
It is to be understood that even though numerous characteristics and advantages of various embodiments of the present invention have been set forth in the foregoing description, together with details of the structure and function of various embodiments of the invention, this detailed description is illustrative only, and changes may be made in detail, especially in matters of structure and arrangements of parts within the principles of the present invention to the full extent indicated by the broad general meaning of the terms in which the appended claims are expressed. For example, the particular elements may vary depending on the particular configuration of the channel surfaces defining the channels without departing from the spirit and scope of the present invention.

## Claims

1. A multiple disc array comprising substantially identical first and second partitions that are removably connectable together, each partition supporting a plurality of data storage devices arranged in noncoplanar first and second arrays, and each partition further defining clearance apertures for passing fasteners therethrough for fixing each data storage device to the respective partition.

2. The multiple disc array of claim 1 wherein each partition defines a plurality of channels, wherein each channel receivingly engages a data storage device.

3. The multiple disc array of claim 2 wherein each channel is defined by a planar support surface and opposing side members extending from the planar support surface, and wherein tab members are disposed at distal ends of the side members opposing the planar support surface.

4. The multiple disc array of claim 3 wherein the tab members define the clearance apertures.

5. The multiple disc array of claim 1 wherein a data storage device in the first array operably spins oppositely with respect to a data storage device in the second array.

6. The multiple disc array of claim 1 wherein the fasteners comprise threaded engagement members.

7. The multiple disc array of claim 1 wherein the plurality of data storage devices in the first and second arrays has electrical connectors that are operably disposed in a coplanar relationship.

8. The multiple disc array of claim 7 comprising a planar printed circuit board with mating electrical connectors that operably connect to the data storage device connectors.

9. The multiple disc array of claim 8 wherein the printed circuit board comprises an external connector that is electrically connected to each of the mating connectors, for placing the plurality of data storage devices in communication with another device.

10. The multiple disc array of claim 9 wherein an insertion direction for connecting the data storage devices to the mating connectors is substantially orthogonal to an insertion direction for connecting the external connector to the other device.

11. A method comprising:
fixing a first plurality of data storage devices to a first partition arranged in noncoplanar first and second arrays;
fixing a second plurality of data storage devices to a second partition arranged in noncoplanar third and fourth arrays; and
joining the first and second partitions together forming a multiple disc array.

12. The method of claim 11 wherein the fixing steps are characterized by the first and second partitions being substantially identical.

13. The method of claim 11 wherein the fixing steps are characterized by each partition defining clearance apertures for passing fasteners therethrough.

14. The method of claim 11 wherein the fixing steps are characterized by slidingly engaging the data storage devices into channels defined by the first and second partitions.

15. The method of claim 11 wherein the fixing steps are characterized by flipping data storage devices in the second array with respect to the first array, and by flipping data storage devices in the fourth array with respect to the third array, so that the data storage devices in the first and second arrays operably spin oppositely and data storage devices in the third and fourth arrays operably spin oppositely.

16. The method of claim 13 wherein the fixing steps are characterized by using threaded fasteners.

17. The method of claim 15 further comprising electrically connecting each of the data storage devices to a common printed circuit board.

18. The method of claim 17 further comprising electrically connecting the common printed circuit board to an external circuit.

19. The method of claim 18 wherein the electrically connecting each of the data storage devices to the common printed circuit board is characterized by insertion forces in a first direction, and wherein the electrically connecting the common printed circuit board to an external circuit is characterized by an insertion force in a second direction substantially orthogonal to the first direction.