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► (54) as (Title) 

► (19)(13)?S 

► (11)S:Ha^(Pub.No.)/^Jf 
* (21)SSB!s(Appl.No.)/a» 

► (51)^H*8IS#(lntCI.) 

► (51) IPC INDEX 



► (57) flef (Abstract) 



DISK-LIKE RECORDING MEDIUM AND DISK RECORDING/ REPRODUCING DEVICE 
USING IT 

CHHE 

(Representative Drawing) 



VJJP A h^IS M£j°^!3E 



1997320204(1997.12.12) 
1996139302(1996.05.31) 
G11B 20/12; G11B 11/10; G11B 20/10 



PROBLEM TO BE SOLVED: To verify in addition a DMA area, to record defect 
information at that time and to calculate its recording amount, etc., from the probability 
theory. 

SOLUTION: This recording medium is divided into a data area 2A recording/ reproducing 
the data and data management areas (DMA areas) 2B, 2C, managing a defect sector in 
the data area, and the DMA areas is constituted of DMA recording areas 20A, 22A, 
recording defect sector information for the data area, a DMA alternation areas 20B, 22B 
for the defect sector of the recording area itself and DMA management areas 20C, 22C, 
managing the defect sector in the DMA area. Although alternate sectors recorded on the 
alternate areas are recorded, respectively on the DMA management areas, in addition to 
the managing defect area in the data management areas, the recording amount and area 
occupancy amount, etc., are decided, based on a condition led by a Poisson distribution. 
Thus, the area is decided efficiently, and even if defect sectors exist, the data are surely 
read, and reliability is improved. COPYRIGHT: (C)1997,JPO 



> (71)S§!eJ(Applicant) 

> (72) Sfg ^(Inventors) 



SONY CORP 



ASANO RYUICHI 
MIYAWAKI HIROYUKI 



> (30) ¥£!^£!m(Priorty No.)/ gi» 



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11/10 11/10 

20/10 7736-5D 20/10 C 



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(3) 



^¥09-320204 



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2 CtfffiBf So rtfllffllDMAxy 7 2 BOrtHlfif- 



(4) 



4#F*W09-320204 



Mvxijmo, ^mijDMAxu7 2 commit 

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DMAXU72B, 2 C (4 3 0<Dxy 7fr5>#t/?Sc£n 

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p= 1 0" 3 

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q = 30 
Q=2 0 0 0 0 

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t = 1 

t*% 0 *■©&«>, s»jaafc < e«*-fed'*-Rsc 



3. 7 x 1 0" 3 



1 . 1 x 1 0" 4 



2. 4 x 1 0" 5 



(5) 



1SHPF09-320204 



S C = 5 x (3+1) = 20 

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tffiftrctC6lc&W?5 Yvv5 (N+l 4) A^DM 
Af-^©DMA^X'J72 2 C£&3 0 

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[0037] m4*pmbTmmt5o How-etirti 

iJDMAXU72 B»C lfiffi (n-l 2 h77^<0m/ 
2-tr**) fcfctffctK nHfl|DMAxU72C05 



DM AIB^X 'J 7 2 2 AC 2 fflfiJ? (h 7 «y^ (N + 
3) <Dm/2*>55tm-h : 7v5<D (m- 1 ) -£5 
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^>y^) tot** nc nam, ^-n^n^RS^fesfeo 

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A tfEgf 5 i: * tt, T't S L T H— r- * IE 

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[0 0 3 8] Ch50*tt*#«UDMAf-* (D 

MAaht§) ^lEirra^ a»k:iB»-rs7 , -*D 

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fE^£ft3o 2#g©|B|-f f -£DMA a -Hi 4 5-t5 
*«*lfc(n-12) h^-y^©m/2-tr^^{ClH^$ 
tl5o LfrU C<V-£55li5:M-<z55T*&Z><DT\ £ 
B-fe^^T?«* (n+l) h?v5(D't55 0lcmBW 
{S5?tl5, DM A x-#ti-tr^2£iS;t 
1^©T\ l-tr^^T10<DDMA-r-^*iR46^Ci:^ 

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OH-f-^DMA a-3*IB8*3***ttfcKH:** 
T*&3<DT\ (N+l 4) h 7 v *0fc«JBfi 
$$tl3 0 Sfe (N + 4) f>7«y*<0 (m-1) ±55 

it%M±.55T°h%<DT\ ccfcsassns^tDMA 
T-5tmmmmtfnt>ft%o ctDt^mmmmt^t 

(N + 4) Y-^y5<D-t55 1 S*t^RS-b^^T'fe§ 
fre>, £<Dm&lc&%<DlEWj; J b55V&%-b52 2l<: 

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tm^V7<DE(D-t55tf!Km-tz55-V&-DT. ^(Ot 

t ifos^fx 'j 7<o-t55 \cm&m&zntcfr*m? d 

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il^n^o IBii^n^DMAmSr-^ti^Pi-tr^^ 
(h^<y^#^i:-b^^#^) i:, fOk t©5#-tr^ 
5 {Y ; yy5m^t±.55^) X*3biT, oM5@ 

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{cj^js-r siiTK bx^is^-r s c k t, v # « . 

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