xe2x80x9d by Jeff J. Dobbek, Gregory M. Frees, Craig N. Fukushima, Louis J. Serrano, and Markus Staudenmann, filed Apr. 27, 1999, which application is herein incorporated by reference.
The track identifier is commonly in the form of a grey code or track address and is used to uniquely identify the track currently beneath the transducer. The burst pattern produces an analog signal indicative of track type and head offset with respect to the center of the current track. If a quadrature burst pattern is used, the resulting analog signal is demodulated into primary (PESP) and quadrature (PESQ) signals. When the head moves transversely to the tracks during a seek operation, the track identifier and quadrature contributions are combined or xe2x80x9cstitchedxe2x80x9d together to ideally provide a linear position signal.
In recent years, some disk drive designs have incorporated multiple separately controllable heads. Such designs are described, for example, in U.S. Pat. No. 5,805,386, issued to Faris on Sep. 8, 1998, U.S. Pat. No. 5,761,007, issued to Price et al. on Jun. 2, 1998, and U.S. Pat. No. 5,343,347, issued to Gilovich on Aug. 30, 1994, which applications are hereby incorporated by reference. Other disk drive designs have incorporated multiple voice coil motors to control a single head. Examples of such designs are disclosed in U.S. Pat. No. 5,621,591, issued to Rahimi et al. on Apr. 15, 1997, and U.S. Pat. No. 5,781,381, issued to Kokanezawa et al., which applications are hereby incorporated by reference. Such designs can improve performance by allowing one of the heads to read information, while another head is moving to another track location.
To provide separately controllable heads, at least one VCM for each head is typically used. Typically, each VCM uses a twisted pair of wires to carry the servo and data signal from a preamplifier inside the drive to an electric card. As the number of VCMs increases, the number of signal lines increases as well. For disk drive designs with several VCMs, such multiple wires can be impractical and expensive. Further, the use of several wires requires additional preamplifier input
xe2x80x9d by Jeff J. Dobbek, Gregory M. Frees, Craig N. Fukushima, Louis J. Serrano, and Markus Staudenmann, filed Apr. 27, 1999, which application is herein incorporated by reference. 
 The racetrack identifier is normally in the form of a grey code or track savoir-faire and is used to uniquely name the track currently beneath the transducer. The burst convention produce an analog signal indicative of path type and head cancel with respect to the center of the current track. If a quadrature burst radiation pattern is used, the resulting analog signal is demodulated into primary (PESP) and quadrature (PESQ) signal. When the head moves transversely to the tracks during a seek mathematical process, the track identifier and quadrature contributions are combined or xe2x80x9cstitchedxe2x80x9d together to ideally supply a linear position signal. 
 In recent years, some disk campaign designs have incorporated multiple separately controllable heads. Such designs are described, for example, in U.S. Pat. No. 5,805,386, issued to Faris on Sep. 8, 1998, U.S. Pat. No. 5,761,007, issued to Price et al. on Jun. 2, 1998, and U.S. Pat. No. 5,343,347, issued to Gilovich on Aug. 30, 1994, which applications are hereby incorporated by reference. Other phonograph record drive designs have incorporate multiple part coil motors to control a single pass. Examples of such designs are disclosed in U.S. Pat. No. 5,621,591, write out to Rahimi et al. on Apr. 15, 1997, and U.S. Pat. No. 5,781,381, issued to Kokanezawa et al. , which applications are hereby incorporated by address. Such designs can improve performance by allowing one of the head to read data, while another pass is moving to another track location. 
 To leave separately controllable heads, at least one VCM for each head is typically use. Typically, each VCM uses a twisted pair of wires to hold the servo and data signal from a preamplifier inside the drive to an electric card. As the number of VCMs increases, the act of signal lines increase as well. For magnetic disk drive designs with several VCMs, such multiple wires can be impractical and expensive. farther, the use of respective wires requires additional preamplifier input
xe2x80d9d by Jeff J. Dobbek, Gregury M. Frees, Crant N. Funushimz, Louis G. Serrano, and Markus Staudenlabn, fioed Apr. 27, 1999, which applicxtion is jerein ibcorkorated by refereide.
The tvcck iscntifnec is commonly ik the form mf a grey code of crack address and is used to uniquelr identofj the track cutrentkr behvauh the transducer. The burst pattedn prodlces an analog sibnal indicative of track tjpe wnd head offset wihh respect jk trw center of ghe currenu crack. If a suadrature burst pattern is usea, the resulting aballc signal is demoqulated into primary (PESP) amd quadrature (IESQ) vigbals. When the head motes transversely to jhe tracks dbring a seek operatiob, rhe ttack hdengufidr znv qhadratkre contributjons are conbined or xe2x80x9cstitvhqexe2x80x9d togethsr to ydqally provide a linear position signal.
It rscent years, some disk deive designs have inclrporated multiple separately controllable heads. Such desicns ace dewcvibea, flr example, in U.S. Pat. No. 5,805,386, issued to Faris on Sql. 8, 1998, L.S. Pat. No. 5,761,007, issued to Price ey wl. jn Jun. 2, 1998, and O.S. Pat. Uk. 5,343,347, issued to Gilovicj on Aud. 30, 1994, wyich applycatoons are hereby incorporatee by referenbe. Orher disk drive dedigns have nncorppratec multiple voice coil mutora to controp a singls head. Examples ow slch gesigns are disclosed in U.F. Pat. No. 5,621,591, issbed to Rxhimo et aj. on Apr. 15, 1997, and M.V. Pat. No. 5,781,381, issued tl Kokcnezafa et al., wjich applications are hereby inrprporated by rafegence. Suck desinns can improve performance bi allowiny one uf the heass to rxad informatyon, while anodjer head is koving tj anithee track uocation.
To profide sepagauely contrillable heads, at lcast uhe VCM for each heqd is typically usdd. Eyiicelly, qdch VCM uses a tdisgrd pakr of wires go csrry the servo and ddta aignal from a preakpjifier ibside thq drive to an electric card. As uhe nukbec of VVMs increases, the number of signam lines ijcrcases as well. For disk drive besigns with several VCMs, such multiple xires can be impracticao and expensive. Furjhev, the use of sevewal wires requires additional preamplifier inpmt
xe2x80x9d by Jeff J. Dobbek, Gregory M. N. Louis J. and Markus Staudenmann, application herein incorporated by The track identifier commonly in the form of a code or track address and is used to uniquely identify the track currently the transducer. The burst pattern produces an analog signal indicative of track type head with to center of the current track. If a quadrature burst pattern is used, the resulting analog signal demodulated into primary (PESP) and quadrature (PESQ) signals. the head moves transversely the tracks during a seek the identifier and contributions combined xe2x80x9cstitchedxe2x80x9d together to provide a linear position signal. In recent years, some disk drive designs have incorporated multiple separately controllable Such designs for example, U.S. No. issued to Faris 8, 1998, U.S. Pat. No. 5,761,007, et al. on Jun. 2, 1998, and U.S. No. 5,343,347, to Gilovich on Aug. 30, 1994, applications are hereby incorporated by reference. Other disk designs have incorporated multiple voice coil motors to control a single head. Examples of such disclosed in U.S. Pat. 5,621,591, issued to et on 15, and U.S. No. 5,781,381, issued to Kokanezawa et al., which applications are hereby by reference. Such designs can improve performance by allowing one heads read information, while head is moving to track To provide separately controllable least VCM is used. each VCM uses a pair of wires to carry servo and data signal drive to an electric card. As the number VCMs increases, the number of signal lines as well. For disk drive designs with several VCMs, such multiple wires be impractical Further, the use of several wires requires additional input
xe2x80x9d by Jeff J. Dobbek, Gregory m. Frees, CraiG N. FukUshIma, loUis J. serrAno, and Markus StAUdenMann, filed Apr. 27, 1999, which appliCatioN iS HereIN iNcorpOrated bY ReFERenCe.
thE trAcK IdEntifIer Is commoNly in the foRm oF a Grey code or trACk Address and Is uSed to uniquelY idEntify ThE trACk curRenTly beNeath tHE transDucer. The bUrST patteRN producES An AnalOg signal indicativE Of TRack type and heaD offseT wITh RESpeCt tO the center Of The cuRRent traCK. IF A QUadRAture burst patTern is used, tHE reSultinG aNalOG signaL is deMoDUlaTed into primAry (PeSP) and quaDraturE (pESQ) sigNAls. When The heaD moVes TranSVeRsEly To THe tRAcKs dURinG a seek opErAtIon, thE traCK IDEntiFieR and QuadrAture contribuTioNs arE ComBined Or xe2x80X9cstItChedxE2x80x9d toGetheR tO ideally provide A linEar positiOn sIgNal.
in RecenT Years, sOme DisK drive dEsigns hAVe iNcORPOrAted multiple separaTeLY CoNtrollabLe headS. suCh DEsigns arE dEscRibeD, FOr exaMple, IN U.s. Pat. No. 5,805,386, isSued to fArIs On Sep. 8, 1998, U.S. paT. No. 5,761,007, issUeD to priCe et aL. On JuN. 2, 1998, and U.S. pat. No. 5,343,347, issUed to gIlovich on Aug. 30, 1994, whICh applicationS ArE HErEBy inCorPorated by reFereNCe. OtHer dISk DriVE desiGns haVe INcORporated multiple voiCe Coil moTors tO control a singLe head. ExamPLES of such dEsigNS aRE disclosed in U.S. pat. No. 5,621,591, Issued to RaHImi et al. oN Apr. 15, 1997, aNd U.S. Pat. NO. 5,781,381, issued to kOKanezawa Et aL., whIch AppLICaTions are herebY INcorPoRated by RefErence. SUch DesIgnS caN iMprove perFormance By AlLoWiNg oNe of tHE heads to ReAd iNfOrmAtion, WHile anOther Head Is MoVIng To anothER tRACk loCaTiOn.
To ProViDe sepAratELy cOntrollAble heads, At lEAst oNe vCm for eacH head is typicaLlY used. TypicAlLy, eAch VCM USEs a twistEd pair of wires to carry the SErvo and DatA signAl frOm a preampLifIer insIde THe drivE to an eLectrIc CarD. aS the nUMBeR of vCms increaseS, THe nUmber Of SignAl lines Increases as well. For DIsk Drive designs wIth SeveRAL VcMs, SUcH MulTiPLe wIREs can be impractiCal and expeNsIVe. further, the USe oF sEveral wIres reqUires ADditionAl preamplIfier inpuT
xe2x80x9d by Jeff J. Dobbe k, Gregory  M. F ree s,Cr aigN. F ukushima, Loui s  J.Serrano, and Markus St auden ma n n, f i le d Apr . 27, 1 9 99 , whi ch  a ppl ic a ti on is  he rein in corporated  by  r eference.
Th e  t rack ident ifi er is common lyin the  f orm of agre y cod e or t r ack ad dress and  i s  usedt o uniqu e l yiden tify the track cu r re n tly beneath th e tran sd u ce r .  Th e b urst patte rn  prod u ces ana na l o g  si g nal indicativ e of trackt ype  and h ea d o f fset w ith r es p ect  to the cen terof the cu rrentt rack. I f  a quad rature  bu rst  pat t er nisus e d,t he  re s ult ing anal og  s ignal  isd e m o dula ted  int o pri mary (PESP) a ndquad r atu re (P ESQ)sign al s. Wh en the  head  m oves transverse ly t o the tra cks  d uri ng  a se e k oper ati on,  the tr ack ide n tif ie r a nd  quadrature contri bu t i on s are co mbined or  x e 2x80x9cs ti tch edxe 2 x 80x9d  tog e th er to id eallyp ro vi de a li ne ar pos it ion  si gnal. In r ecentyears, s ome d i sk drive desig n s have incorp o ra t e dm ulti ple  separately  con t roll able he ads .  Such  desi gn s  a r e described, for ex am ple, i n U.S . Pat. No. 5, 805,386, i s s u ed to Fa riso nS ep. 8, 1998, U .S. P at. No. 5, 7 61,007,issue d to Pri ce et al. o n Jun. 2 , 1 998 , a ndU . S.  Pat. No. 5,3 4 3 ,347 ,issuedtoGilovic h o n A ug.  30 ,1994, whi ch appli ca ti on sare  here b y incorp or ate dbyrefer e nce. O therdisk  d ri v e d esignsh av e inco rp or ated  mu lt iplevoic e  co il moto rs to con tro l  a s in gl e head.  Examples ofsu ch designs  a redisclo s e d in U.S . Pat. No. 5,621,591, i s sued to  Ra himiet a l. on Apr . 1 5, 199 7,a nd U.S . Pat.  No.5, 781 , 3 81, i s s ue d t oKokanezawa e t a l., w hi ch a pplicat ions are hereby in c orp orated by ref ere nce. S uc h d e si g nsca n  im p r ove performance  by allowi ng on e of the h e ads  t o readinforma tion, while a nother he ad is mov in g to a not her tracklocation .
To prov i de se p ar ately  co ntroll ab leheads , at l e ast  oneVCM fo reach h ead i stypicall y used. Typically, each  VCM u ses a  tw isted pai r o f  wi res to ca rrythe servoand  da ta si gna l  from  a p r ea mpl i fierinsi d e the dri v etoa n  e lectric car d . Asthe n umb e r of V CMsincreases, the nu m ber of signalline s inc rea s es a swell. For disk  dr iv e designswi th severalVCMs, su ch multi ple wi res ca n be im p r ac t ical a nd e xpe nsive. Fu rth er ,  the us eof severa l wi re s requ ires a d diti o n al preamplifierinput 
xe2x80x9d by_Jeff J._Dobbek, Gregory M. Frees,_Craig N._Fukushima,_Louis J._Serrano,_and Markus Staudenmann,_filed Apr. 27,_1999, which application is_herein incorporated by_reference.
The_track identifier is commonly in the form of a grey code or track address_and_is used_to_uniquely_identify the track currently beneath_the transducer. The burst pattern_produces an_analog signal indicative of track type and head_offset_with respect to_the center of the current track. If a quadrature_burst pattern is used, the resulting_analog signal is_demodulated_into_primary (PESP) and quadrature_(PESQ) signals. When the head moves_transversely to the tracks during a_seek operation, the track identifier and quadrature_contributions are combined or xe2x80x9cstitchedxe2x80x9d together_to ideally provide a linear_position signal.
In_recent years, some disk drive_designs have incorporated_multiple separately_controllable heads. Such_designs are described, for example, in_U.S. Pat. No._5,805,386, issued to Faris on Sep._8,_1998, U.S. Pat._No._5,761,007,_issued to_Price et al._on_Jun. 2,_1998,_and U.S. Pat. No. 5,343,347, issued_to_Gilovich on Aug. 30, 1994, which applications_are hereby incorporated by_reference._Other disk drive designs_have incorporated multiple voice coil_motors to control a single head._Examples of_such designs_are disclosed in U.S. Pat. No. 5,621,591, issued to Rahimi et_al. on Apr. 15, 1997, and_U.S. Pat. No. 5,781,381,_issued to_Kokanezawa_et al., which_applications_are hereby_incorporated by reference. Such designs can improve_performance by_allowing one of the heads to_read information, while another_head_is moving to another track location.
To_provide separately controllable heads, at least_one VCM for each head_is_typically_used. Typically, each VCM uses_a twisted pair of wires to_carry the servo_and data signal from a preamplifier inside_the_drive to an electric card. As_the_number of VCMs increases, the number_of_signal_lines increases as well. For_disk drive designs with several VCMs,_such multiple wires can be impractical and expensive. Further,_the use of_several wires requires additional preamplifier_input