US20080123213A1 - Multi-arm disk drive system having interleaved read/write operations and method of controlling same - Google Patents
Multi-arm disk drive system having interleaved read/write operations and method of controlling same Download PDFInfo
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- US20080123213A1 US20080123213A1 US11/278,283 US27828306A US2008123213A1 US 20080123213 A1 US20080123213 A1 US 20080123213A1 US 27828306 A US27828306 A US 27828306A US 2008123213 A1 US2008123213 A1 US 2008123213A1
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/48—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed
- G11B5/54—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed with provision for moving the head into or out of its operative position or across tracks
- G11B5/55—Track change, selection or acquisition by displacement of the head
- G11B5/5521—Track change, selection or acquisition by displacement of the head across disk tracks
- G11B5/5526—Control therefor; circuits, track configurations or relative disposition of servo-information transducers and servo-information tracks for control thereof
- G11B5/553—Details
- G11B5/5547—"Seek" control and circuits therefor
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/06—Digital input from, or digital output to, record carriers, e.g. RAID, emulated record carriers or networked record carriers
- G06F3/0601—Interfaces specially adapted for storage systems
- G06F3/0668—Interfaces specially adapted for storage systems adopting a particular infrastructure
- G06F3/0671—In-line storage system
- G06F3/0673—Single storage device
- G06F3/0674—Disk device
- G06F3/0676—Magnetic disk device
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/012—Recording on, or reproducing or erasing from, magnetic disks
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/48—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed
- G11B5/4806—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed specially adapted for disk drive assemblies, e.g. assembly prior to operation, hard or flexible disk drives
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/48—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed
- G11B5/54—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed with provision for moving the head into or out of its operative position or across tracks
- G11B5/55—Track change, selection or acquisition by displacement of the head
- G11B5/5521—Track change, selection or acquisition by displacement of the head across disk tracks
- G11B5/5569—Track change, selection or acquisition by displacement of the head across disk tracks details of specially adapted mobile parts, e.g. electromechanical control devices
- G11B5/5578—Multiple actuators addressing the same disk, e.g. to improve data rate or access rate
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/06—Digital input from, or digital output to, record carriers, e.g. RAID, emulated record carriers or networked record carriers
- G06F3/0601—Interfaces specially adapted for storage systems
- G06F3/0628—Interfaces specially adapted for storage systems making use of a particular technique
- G06F3/0655—Vertical data movement, i.e. input-output transfer; data movement between one or more hosts and one or more storage devices
- G06F3/0659—Command handling arrangements, e.g. command buffers, queues, command scheduling
Definitions
- the present invention generally relates to the field of non-volatile data storage.
- the present invention is directed to a multi-arm disk drive system having interleaved read/write operations and method of controlling same.
- Hard disk drives are used in many applications where relatively fast, economical, non-volatile mass storage is desired.
- hard disk drives are commonly used in computer servers, mainframe computers, personal computers, laptop computers, digital video recorders, music and multimedia devices, personal digital assistants, digital cameras and cellular telephones, among other things.
- Hard disk technology has evolved significantly since the first commercial hard disk drive became available in 1956.
- Present hard disk drives typically include a plurality of platters that spin at a constant angular velocity about a common rotational axis, or spindle.
- Common form factors, or platter diameters, of present generation hard disk drives are 3.5 in., 2.5 in., 1.8 in., 1 in. and 0.85 in. That said, other diameter platters are available.
- the platters are typically made of a non-metallic material, e.g., glass or aluminum, coated on both major surfaces with a magnetic recording material, typically iron oxide, that form the data storage surfaces of the drive.
- Present hard disk drives typically have a single armature that moves multiple read/write heads, one for each data storage surface, in unison with one another.
- the multiple heads are used for redundancy or for increasing the speed of a given data transfer (read or write) operation by using some or all of the read/write heads simultaneously for that data transfer.
- the multiple heads per data storage surface are controlled so that the read/write head closest to the location of the data at any given time is used for the data transfer. The one or more remaining read/write heads for that surface do not participate in that data transfer and await subsequent data transfer requests that call them into action.
- the present invention is directed to a disk drive system responsive to a plurality of data transfer requests requiring a plurality of corresponding respective seeks and a plurality of corresponding respective data transfers.
- the disk drive system comprises a housing and at least one platter rotatably mounted within the housing.
- the at least one platter has a first data storage surface containing a plurality of surficial data storage locations.
- a first read/write head is movably mounted within the housing and is configured to read and write data to ones of the plurality of surficial data storage locations.
- a first actuator assembly supports the first read/write head and is configured to move the first read/write head so that the first read/write head is able to access the plurality of surficial data storage locations.
- At least a second read/write head is movably mounted within the housing and is configured to read and write data to ones of the plurality of surficial data storage locations.
- a second actuator assembly supports the second read/write head and is configured to move the second read/write head independently of the first read/write head and so that the second read/write head is able to access the plurality of surficial data storage locations.
- a controller is operatively connected to the first actuator assembly and the second actuator assembly. The controller is responsive to the plurality of data transfer requests by interleaving the plurality of corresponding respective seeks between the first actuator assembly and the second actuator assembly.
- the present invention is directed to a method of controlling a disk drive that includes at least one platter having at least one storage surface, the disk drive further including at least two read/write heads in working relationship with the at least one storage surface.
- the method comprises receiving a plurality of data transfer requests that require a plurality of corresponding respective seeks and a plurality of corresponding respective data transfers.
- the at least two read/write heads are moved so as to interleave the plurality of corresponding respective seeks with one another.
- the at least two read/write heads are activated so as to perform the plurality of corresponding respective data transfers relative to the at least one storage surface.
- FIG. 1 is a plan view of a disk drive system of the present invention with the cover removed;
- FIG. 2 is an enlarged cross-sectional view of the disk drive system of FIG. 1 ;
- FIG. 3 is a timing diagram illustrating the seek and data transfer operations of the disk drive system of FIG. 1 ;
- FIG. 4 is flow diagram showing an interleaving scheme of controlling the seek and data transfer operations of the disk drive system of FIG. 1 .
- FIGS. 1 and 2 illustrate a multi-armature hard disk drive (HDD) system 100 of the present invention that, as discussed below in much more detail, includes various features that reduce the average seek time of the system relative to conventional single and multi-arm HDD systems.
- HDD system 100 may include a housing 102 that contains one or more platters 104 , such as the four platters 104 A-D particularly shown in FIG. 2 , that are rotatable about a common spindle 108 relative to the housing.
- Each platter 104 A-D may have first and second data storage surfaces 112 A-B, which may be provided with its data storage capacity in any suitable manner.
- each data storage surface 112 A-B may have a magnetic storage surface comprising iron oxide or other magnetic material.
- the details of manufacturing platters 104 A-D suitable for use with the present invention are well known in the art and, therefore, need not be described in any detail herein for those skilled in the art to understand the broad scope of the present invention.
- HDD system 100 may further include a plurality of actuator assemblies, e.g., the two armature assemblies 116 A-B shown, that each support and move a set of read/write heads 120 A-B independently of one another.
- the number of read/write heads 120 A-B on each assembly 116 A-B will typically correspond to the number of data storage surfaces 112 A-B.
- any given read or write request may involve the use of one or more of read/write heads 120 A or read/write heads 120 B in satisfying that request.
- Each armature assembly 116 A-B may include an armature 124 A-B and an actuator 128 A-B operatively configured to move the respective armature during a data location seek.
- Each actuator 128 A-B may include, e.g., a linear motor, voice coil, etc. (not shown) for moving the respective armature 124 A-B.
- a linear motor e.g., a linear motor
- voice coil e.g., a linear motor
- actuator assemblies 116 A-B may also be used with a disk drive system of the present invention.
- a variety of multi-head arrangements and actuator assembly types suitable for use with the present invention are shown in U.S. Pat. No. 6,883,062 to Susnjar, which is incorporated herein by reference for its disclosure of the various arrangements and actuator assembly types.
- each armature assembly 116 A-B and each read/write head 120 A-B may be controlled by a suitable controller 132 , which may also provide an interface between HDD system 100 and whatever device(s) (not shown), e.g., one or more computer servers, mainframe computers, personal computers, laptop computers, digital video recorders, music and multimedia devices, personal digital assistants, digital cameras, cellular telephones, etc., to which the HDD system is connected.
- controller 132 may be implemented in any suitable hardware, software or combination of hardware and software. The functionality of controller 132 is discussed in much more detail below.
- HDD system 100 receives from such device(s) one or more continual flows of data transfer requests, i.e., requests for either reading specific data from data storage surfaces 112 A-B of platters 104 A-D or writing specific data to the data storage surfaces.
- controller 132 will typically also receive the data to be written to data storage surfaces 112 A-B. Consequently, controller 132 may include the functionality required to coordinate the writing of data to data storage surfaces 112 A-B so that it may be read in response to an appropriate read request. Controller 132 will typically also output the data corresponding to the read requests. Therefore, controller 132 may also be provided with functionality required to coordinate the data read from the data storage surfaces 112 A-B with the corresponding respective read requests. It is noted that while controller 132 is shown located inside housing 102 , in other embodiments the controller may be located outside the housing.
- an important feature of HDD system 100 is its ability to reduce the average seek time needed to respond to a set of data transfer requests. This may be accomplished by interleaving with one another the data transfer operations, e.g., seek-and-write or seek-and-read operations, performed by HDD system 100 in response to the various incoming data transfer requests.
- This interleaving functionality may be provided by controller 132 .
- one interleaving scheme suitable for use with HDD system 100 of FIGS. 1 and 2 is illustrated by the timing diagram 200 of FIG. 3 . Referring to FIG. 3 , and also to FIGS. 1 and 2 , timing diagram 200 of FIG.
- Each data operation set includes a seek 216 and a data transfer 220 A-H, i.e., either a read or write depending upon the nature of the corresponding data transfer request 212 A-H.
- timing diagram 200 The interleaving scheme illustrated by timing diagram 200 is based on the concept of performing the data transfers 220 A-H of the multiple data transfer operation sets 204 A-D, 208 A-D in the same temporally sequential order as the receipt of data transfer requests 212 A-H. This is accomplished by adding a stall cycle 224 to each data transfer operation set 204 A-D, 208 A-D in which the seek 216 of that set is finished before the data transfer 220 A-H of the immediately prior data transfer request 212 A-H is completed.
- the length of each stall cycle 224 may be the length of time needed for the immediately preceding data transfer 220 A-H to end, plus any time needed for controller 132 or other circuitry to be ready to handle another data transfer.
- a seek 216 and corresponding data transfer 220 A-H are completed for a particular data transfer request 212 A-B before the seek is completed for the immediately following request, then a stall cycle is not necessary.
- Maintaining the temporal sequential order in the data transfers 220 A-H, as is done in the interleaving scheme illustrated in FIG. 3 generally simplifies the functionality of controller 132 in that the controller is not responsible for tracking and correlating unordered data transfers, particularly reads, with the temporally sequentially ordered data transfer requests 212 A-H. That said, in alternative embodiments of the present invention, the interleaving of data request operation need not result in such ordered data transfers. For example, in one alternative embodiment (not shown) as soon as a data transfer is complete, the next seek to perform may take place. If the corresponding controller were configured to handle only one data transfer at a time, a stall cycle could be added to prevent a data bus conflict.
- the controller or other circuitry would need to include functionality for correlating the data read transfers, particularly the reads, with the corresponding respective data read requests. This would add to the complexity of the controller or other circuitry.
- FIG. 4 illustrates a flow diagram 300 for performing the interleaving scheme illustrated in timing diagram 200 of FIG. 3 within HDD system 100 of FIGS. 1 and 2 .
- controller 132 receives a data transfer request.
- controller 132 determines whether or not armature assembly 116 A and/or corresponding read/write head(s) 120 A are busy handling a prior data transfer request. If not, at step 315 controller 132 activates armature assembly 116 A so as to position the appropriate read/write head 120 A at the proper location for performing the requested data transfer to or from the corresponding data storage surface 112 A-B. Step 315 may be referred to as a seek step.
- controller 132 determines whether or not the other armature assembly 116 B and/or corresponding read/write head(s) 120 B are busy with a prior request. If so, the interleaving scheme enters a stall loop 325 that continues to execute until the other armature assembly 116 B and/or corresponding read/write head(s) 120 B are done with the prior request. It is noted that the effect of stall loop 325 is not illustrated in FIG. 3 . However, referring to FIG. 3 , its effect can be visualized by extending seek 216 associated with data transfer request 212 D beyond the data transfer 220 E associated with request 212 E.
- stall loop 325 would not permit the data transfer 220 E of data transfer request 212 E to occur until after the data transfer 220 D of request 212 D by inserting a stall cycle 224 between the seek 216 and the data transfer 220 E of request 212 E.
- the interleaving scheme may proceed to step 330 at which controller 132 causes the data transfer from or to the corresponding respective data storage surface(s) 112 A-B to occur for the current request. Once the data transfer has been completed, the interleaving technique may cycle back to step 305 at which point another data transfer request is received by controller 132 .
- controller 132 may determine at step 335 whether or not armature assembly 116 B and/or read/write head(s) 120 B are busy with a prior request. If so, the interleaving scheme may enter a wait loop 340 that continues until one or both armature assemblies 116 A-B and corresponding respective read/write heads 120 A-B are no longer busy with a prior request.
- controller 132 determines that armature assembly 116 B and read/write head(s) 120 B were not busy (and armature assembly 116 A and read/write head(s) 120 A were busy at step 310 ), at step 345 controller 132 activates armature assembly 116 B so as to position read/write head(s) 120 B at the proper location for performing the requested data transfer to or from the corresponding data storage surface(s) 112 A-B. Step 345 may be referred to as a seek step. After seek step 345 , at step 350 controller 132 determines whether or not the other armature assembly 116 A and/or corresponding read/write head(s) 120 A are busy with a prior request.
- the interleaving scheme enters a stall loop 355 that continues to execute until the other armature assembly 116 A and/or corresponding read/write head(s) 120 A are done with the prior request.
- the effect of stall loop 355 is illustrated twice in FIG. 3 , once in connection with data transfer request 212 B and once in connection with data transfer request 212 F.
- the interleaving scheme may proceed to step 360 at which point controller 132 causes the data transfer from or to the corresponding respective data storage surface(s) 112 A-B to occur for the current request. Once the data transfer has been completed, the interleaving technique may cycle back to step 305 at which point another data transfer request is received by controller 132 .
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Abstract
Description
- The present invention generally relates to the field of non-volatile data storage. In particular, the present invention is directed to a multi-arm disk drive system having interleaved read/write operations and method of controlling same.
- Hard disk drives are used in many applications where relatively fast, economical, non-volatile mass storage is desired. For example, hard disk drives are commonly used in computer servers, mainframe computers, personal computers, laptop computers, digital video recorders, music and multimedia devices, personal digital assistants, digital cameras and cellular telephones, among other things. Hard disk technology has evolved significantly since the first commercial hard disk drive became available in 1956.
- Present hard disk drives typically include a plurality of platters that spin at a constant angular velocity about a common rotational axis, or spindle. Common form factors, or platter diameters, of present generation hard disk drives are 3.5 in., 2.5 in., 1.8 in., 1 in. and 0.85 in. That said, other diameter platters are available. The platters are typically made of a non-metallic material, e.g., glass or aluminum, coated on both major surfaces with a magnetic recording material, typically iron oxide, that form the data storage surfaces of the drive. Present hard disk drives typically have a single armature that moves multiple read/write heads, one for each data storage surface, in unison with one another.
- Several more recent designs utilize multiple read/write heads per data storage surface and move these multiple heads with corresponding respective independent armatures. In some of these designs, the multiple heads are used for redundancy or for increasing the speed of a given data transfer (read or write) operation by using some or all of the read/write heads simultaneously for that data transfer. In others of these designs, the multiple heads per data storage surface are controlled so that the read/write head closest to the location of the data at any given time is used for the data transfer. The one or more remaining read/write heads for that surface do not participate in that data transfer and await subsequent data transfer requests that call them into action. While these recent simultaneous read/simultaneous write and closest-to-the-data designs increase the speed of the respective hard disk drives, improvement in the average seek time, i.e., the average time it takes for the read/write head(s) to be moved to a desired data transfer location over a plurality of read/write requests, is highly desirable.
- In one aspect, the present invention is directed to a disk drive system responsive to a plurality of data transfer requests requiring a plurality of corresponding respective seeks and a plurality of corresponding respective data transfers. The disk drive system comprises a housing and at least one platter rotatably mounted within the housing. The at least one platter has a first data storage surface containing a plurality of surficial data storage locations. A first read/write head is movably mounted within the housing and is configured to read and write data to ones of the plurality of surficial data storage locations. A first actuator assembly supports the first read/write head and is configured to move the first read/write head so that the first read/write head is able to access the plurality of surficial data storage locations. At least a second read/write head is movably mounted within the housing and is configured to read and write data to ones of the plurality of surficial data storage locations. A second actuator assembly supports the second read/write head and is configured to move the second read/write head independently of the first read/write head and so that the second read/write head is able to access the plurality of surficial data storage locations. A controller is operatively connected to the first actuator assembly and the second actuator assembly. The controller is responsive to the plurality of data transfer requests by interleaving the plurality of corresponding respective seeks between the first actuator assembly and the second actuator assembly.
- In another aspect, the present invention is directed to a method of controlling a disk drive that includes at least one platter having at least one storage surface, the disk drive further including at least two read/write heads in working relationship with the at least one storage surface. The method comprises receiving a plurality of data transfer requests that require a plurality of corresponding respective seeks and a plurality of corresponding respective data transfers. The at least two read/write heads are moved so as to interleave the plurality of corresponding respective seeks with one another. The at least two read/write heads are activated so as to perform the plurality of corresponding respective data transfers relative to the at least one storage surface.
- For the purpose of illustrating the invention, the drawings show a form of the invention that is presently preferred. However, it should be understood that the present invention is not limited to the precise arrangements and instrumentalities shown in the drawings, wherein:
-
FIG. 1 is a plan view of a disk drive system of the present invention with the cover removed; -
FIG. 2 is an enlarged cross-sectional view of the disk drive system ofFIG. 1 ; -
FIG. 3 is a timing diagram illustrating the seek and data transfer operations of the disk drive system ofFIG. 1 ; and -
FIG. 4 is flow diagram showing an interleaving scheme of controlling the seek and data transfer operations of the disk drive system ofFIG. 1 . - Referring now to the drawings,
FIGS. 1 and 2 illustrate a multi-armature hard disk drive (HDD)system 100 of the present invention that, as discussed below in much more detail, includes various features that reduce the average seek time of the system relative to conventional single and multi-arm HDD systems.HDD system 100 may include ahousing 102 that contains one ormore platters 104, such as the four platters 104A-D particularly shown inFIG. 2 , that are rotatable about acommon spindle 108 relative to the housing. Each platter 104A-D may have first and seconddata storage surfaces 112A-B, which may be provided with its data storage capacity in any suitable manner. For example, eachdata storage surface 112A-B may have a magnetic storage surface comprising iron oxide or other magnetic material. The details of manufacturing platters 104A-D suitable for use with the present invention are well known in the art and, therefore, need not be described in any detail herein for those skilled in the art to understand the broad scope of the present invention. -
HDD system 100 may further include a plurality of actuator assemblies, e.g., the two armature assemblies 116A-B shown, that each support and move a set of read/writeheads 120A-B independently of one another. The number of read/writeheads 120A-B on eachassembly 116A-B will typically correspond to the number ofdata storage surfaces 112A-B. In this connection, it is noted that any given read or write request may involve the use of one or more of read/writeheads 120A or read/writeheads 120B in satisfying that request. Eacharmature assembly 116A-B may include anarmature 124A-B and anactuator 128A-B operatively configured to move the respective armature during a data location seek. Eachactuator 128A-B may include, e.g., a linear motor, voice coil, etc. (not shown) for moving therespective armature 124A-B. Those skilled in the art will readily appreciate that while pivoting type actuator assemblies 116A-B are shown, other types of actuator assemblies, e.g., linear movement type actuator assemblies, may also be used with a disk drive system of the present invention. A variety of multi-head arrangements and actuator assembly types suitable for use with the present invention are shown in U.S. Pat. No. 6,883,062 to Susnjar, which is incorporated herein by reference for its disclosure of the various arrangements and actuator assembly types. - The operation of each
armature assembly 116A-B and each read/writehead 120A-B may be controlled by asuitable controller 132, which may also provide an interface betweenHDD system 100 and whatever device(s) (not shown), e.g., one or more computer servers, mainframe computers, personal computers, laptop computers, digital video recorders, music and multimedia devices, personal digital assistants, digital cameras, cellular telephones, etc., to which the HDD system is connected. As those skilled in the art will appreciate,controller 132 may be implemented in any suitable hardware, software or combination of hardware and software. The functionality ofcontroller 132 is discussed in much more detail below. - In general,
HDD system 100 receives from such device(s) one or more continual flows of data transfer requests, i.e., requests for either reading specific data fromdata storage surfaces 112A-B of platters 104A-D or writing specific data to the data storage surfaces. Accompanying the write requests,controller 132 will typically also receive the data to be written todata storage surfaces 112A-B. Consequently,controller 132 may include the functionality required to coordinate the writing of data todata storage surfaces 112A-B so that it may be read in response to an appropriate read request.Controller 132 will typically also output the data corresponding to the read requests. Therefore,controller 132 may also be provided with functionality required to coordinate the data read from thedata storage surfaces 112A-B with the corresponding respective read requests. It is noted that whilecontroller 132 is shown located insidehousing 102, in other embodiments the controller may be located outside the housing. - As mentioned above, an important feature of
HDD system 100 is its ability to reduce the average seek time needed to respond to a set of data transfer requests. This may be accomplished by interleaving with one another the data transfer operations, e.g., seek-and-write or seek-and-read operations, performed byHDD system 100 in response to the various incoming data transfer requests. This interleaving functionality may be provided bycontroller 132. For example, one interleaving scheme suitable for use withHDD system 100 ofFIGS. 1 and 2 is illustrated by the timing diagram 200 ofFIG. 3 . Referring toFIG. 3 , and also toFIGS. 1 and 2 , timing diagram 200 ofFIG. 3 illustrates the datatransfer operation sets 204A-D ofarmature assembly 116A and read/writehead 120A and the datatransfer operation sets 208A-D ofarmature assembly 116B and read/writehead 120B corresponding to an exemplary set of eight temporally sequentialdata transfer requests 212A-H. Each data operation set includes a seek 216 and adata transfer 220A-H, i.e., either a read or write depending upon the nature of the correspondingdata transfer request 212A-H. - The interleaving scheme illustrated by timing diagram 200 is based on the concept of performing the
data transfers 220A-H of the multiple datatransfer operation sets 204A-D, 208A-D in the same temporally sequential order as the receipt ofdata transfer requests 212A-H. This is accomplished by adding astall cycle 224 to each data transfer operation set 204A-D, 208A-D in which the seek 216 of that set is finished before thedata transfer 220A-H of the immediately priordata transfer request 212A-H is completed. The length of eachstall cycle 224 may be the length of time needed for the immediately preceding data transfer 220A-H to end, plus any time needed forcontroller 132 or other circuitry to be ready to handle another data transfer. Of course, if a seek 216 andcorresponding data transfer 220A-H are completed for a particulardata transfer request 212A-B before the seek is completed for the immediately following request, then a stall cycle is not necessary. - Maintaining the temporal sequential order in the data transfers 220A-H, as is done in the interleaving scheme illustrated in
FIG. 3 , generally simplifies the functionality ofcontroller 132 in that the controller is not responsible for tracking and correlating unordered data transfers, particularly reads, with the temporally sequentially ordered data transfer requests 212A-H. That said, in alternative embodiments of the present invention, the interleaving of data request operation need not result in such ordered data transfers. For example, in one alternative embodiment (not shown) as soon as a data transfer is complete, the next seek to perform may take place. If the corresponding controller were configured to handle only one data transfer at a time, a stall cycle could be added to prevent a data bus conflict. On the other hand, if the controller were configured to simultaneously handle a number of data transfers equal to the number of read/write heads, then such stall cycles would not be needed. In either of these alternative interleaving schemes, the controller or other circuitry would need to include functionality for correlating the data read transfers, particularly the reads, with the corresponding respective data read requests. This would add to the complexity of the controller or other circuitry. - Referring to
FIG. 4 , and also toFIGS. 1-3 ,FIG. 4 illustrates a flow diagram 300 for performing the interleaving scheme illustrated in timing diagram 200 ofFIG. 3 withinHDD system 100 ofFIGS. 1 and 2 . Atstep 305,controller 132 receives a data transfer request. Atstep 310,controller 132 determines whether or notarmature assembly 116A and/or corresponding read/write head(s) 120A are busy handling a prior data transfer request. If not, at step 315controller 132 activatesarmature assembly 116A so as to position the appropriate read/write head 120A at the proper location for performing the requested data transfer to or from the correspondingdata storage surface 112A-B. Step 315 may be referred to as a seek step. After seek step 315, atstep 320controller 132 determines whether or not theother armature assembly 116B and/or corresponding read/write head(s) 120B are busy with a prior request. If so, the interleaving scheme enters astall loop 325 that continues to execute until theother armature assembly 116B and/or corresponding read/write head(s) 120B are done with the prior request. It is noted that the effect ofstall loop 325 is not illustrated inFIG. 3 . However, referring toFIG. 3 , its effect can be visualized by extending seek 216 associated withdata transfer request 212D beyond thedata transfer 220E associated withrequest 212E. In this case,stall loop 325 would not permit thedata transfer 220E ofdata transfer request 212E to occur until after thedata transfer 220D ofrequest 212D by inserting astall cycle 224 between the seek 216 and thedata transfer 220E ofrequest 212E. - If, on the other hand, the
other armature assembly 116B and/or read/write head (s) 120B are not busy with a prior data transfer request atstep 320, the interleaving scheme may proceed to step 330 at whichcontroller 132 causes the data transfer from or to the corresponding respective data storage surface(s) 112A-B to occur for the current request. Once the data transfer has been completed, the interleaving technique may cycle back to step 305 at which point another data transfer request is received bycontroller 132. - If at
step 310controller 132 had determined thatarmature assembly 116A and/or read/write head(s) 120A were busy with a prior data transfer request, the controller may determine atstep 335 whether or notarmature assembly 116B and/or read/write head(s) 120B are busy with a prior request. If so, the interleaving scheme may enter await loop 340 that continues until one or botharmature assemblies 116A-B and corresponding respective read/write heads 120A-B are no longer busy with a prior request. If atstep 335controller 132 determines thatarmature assembly 116B and read/write head(s) 120B were not busy (andarmature assembly 116A and read/write head(s) 120A were busy at step 310), atstep 345controller 132 activatesarmature assembly 116B so as to position read/write head(s) 120B at the proper location for performing the requested data transfer to or from the corresponding data storage surface(s) 112A-B. Step 345 may be referred to as a seek step. After seekstep 345, atstep 350controller 132 determines whether or not theother armature assembly 116A and/or corresponding read/write head(s) 120A are busy with a prior request. If so, the interleaving scheme enters astall loop 355 that continues to execute until theother armature assembly 116A and/or corresponding read/write head(s) 120A are done with the prior request. The effect ofstall loop 355 is illustrated twice inFIG. 3 , once in connection withdata transfer request 212B and once in connection withdata transfer request 212F. - If, on the other hand, the
other armature assembly 116A and/or read/write head(s) 120A are not busy with a prior data transfer request atstep 350, the interleaving scheme may proceed to step 360 at whichpoint controller 132 causes the data transfer from or to the corresponding respective data storage surface(s) 112A-B to occur for the current request. Once the data transfer has been completed, the interleaving technique may cycle back to step 305 at which point another data transfer request is received bycontroller 132. - Those skilled in the art will readily appreciate that the interleaving scheme illustrated by flow diagram 300 of
FIG. 4 is merely exemplary and that a variety of alternative interleaving schemes are possible and may be readily implemented with an understanding of the present disclosure. - Although the invention has been described and illustrated with respect to an exemplary embodiment thereof, it should be understood by those skilled in the art that the foregoing and various other changes, omissions and additions may be made therein and thereto, without parting from the spirit and scope of the present invention.
Claims (9)
Priority Applications (5)
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US11/278,283 US7385781B1 (en) | 2006-03-31 | 2006-03-31 | Multi-arm disk drive system having interleaved read/write operations and method of controlling same |
CN2007100016211A CN101046975B (en) | 2006-03-31 | 2007-01-09 | Disk driver system and its control method |
TW096110377A TW200809801A (en) | 2006-03-31 | 2007-03-26 | Multi-arm disk drive system having interleaved read/write operations and method of controlling same |
JP2007085537A JP2007273074A (en) | 2006-03-31 | 2007-03-28 | Multiarm disk drive system for performing interleaved read/write operation, and method of controlling thereof |
US12/127,108 US7710683B2 (en) | 2006-03-31 | 2008-05-27 | Multi-arm disk drive system having interleaved read/write operations and method of controlling same |
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US11/278,283 US7385781B1 (en) | 2006-03-31 | 2006-03-31 | Multi-arm disk drive system having interleaved read/write operations and method of controlling same |
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US12/127,108 Continuation US7710683B2 (en) | 2006-03-31 | 2008-05-27 | Multi-arm disk drive system having interleaved read/write operations and method of controlling same |
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Also Published As
Publication number | Publication date |
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CN101046975B (en) | 2010-09-15 |
TW200809801A (en) | 2008-02-16 |
CN101046975A (en) | 2007-10-03 |
JP2007273074A (en) | 2007-10-18 |
US7710683B2 (en) | 2010-05-04 |
US7385781B1 (en) | 2008-06-10 |
US20080225431A1 (en) | 2008-09-18 |
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