PART 1 TE and FE: an Introduction

BenQ Corporation
Storage Business Division
9th N ovem b er, 2 004 .
V er. 1.0
PART 1
TE a n d F E : a n I n t r o d u c t i o n
What is TE and FE?
TE (Tracking Error) sh ow s h ow w ell th e d riv e f ollow s th e p red ef ined
track on th e d isc. F E (F ocu s Error) sh ow s h ow w ell th e d riv e is able to
f ocu s th e laser on th e d isc. Wh en laser beam
cannot f ocu s h oriz ontally
and v ertically , TE and F E w ill occu r and can be record ed . Th at m eans,
low er and sm ooth er TE and F E error lev el ind icates laser beam
can
f ocu s m ore p recisely on d isc tracks.
I m p o r tanc e o f TE and FE
1.
A good q u ality d isc w ill h av e clear track so a d riv e can w rite d ata on
it m ore easily . A nd a correctly f ocu sed laser w ill m ake a correctly
d ef ined p it. Th eref ore, low TE/ F E error lev el can m ax im iz e th e
w riting strategy p erf orm ance of th e d riv e.
2.
Wh en bu rning at low sp eed , d riv e serv o u su ally h as th e ability to
com p ensate sm all TE/ F E v ariance of th e d isc. Bu t w h en bu rning
sp eed increases, TE/ F E p lay s im p ortant role to h elp u s id entif y if th e
d isc can su ccessf u lly bu rn u nd er d esired sp eed . I m agine w h en y ou
d riv e at h igh sp eed , th e sm ooth lev el of th e road w ill d ecid e if th is is
going to be a bu m p y rid e.
3.
H ere w e h av e 3 grap h s to d em onstrate TE and F E u sing BenQ ’s
Q S can (d etail d escrip tion of Q S can w ill be cov ered in P art 2).
X-ax is d escribes d isc track location and Y -ax is m arks TE and F E
error lev el. Criteria are set as: TE 50 0 and F E 450 . Th ey are
relativ e v alu es rath er th an absolu te ones. Wh en th e m easu red TE
or F E v alu e goes bey ond d ef ined criteria at som e d isc location
Graph -1: Go o d D i s c
once, Q S can w ill d eterm ine th e d isc as “not recom m end ed ” f or
bu rning u nd er selected sp eed , becau se d isc w ill likely to
encou nter w rite f ail or read f ail at th at ad d ress.
4.
Based on ou r p rev iou s d escrip tion, a d isc th at m akes w riting
strategy d ep loy ed w ell sh ou ld h av e (1) TE/ F E m easu rem ent
beneath criteria and (2) stable line sh ap e. F or ex am p le, d isc of
Graph-2: U n d e r c ri t e ri a b u t T E/ F E n o t s t ab l e
G rap h -1 m eets both req u irem ents. U su ally th is kind of d iscs w ill
be q u alif ied as “good ” or A -grad e d iscs.
5.
I t’s w orth noted th at ev en a d isc th at h as TE/ F E beneath criteria
like G rap h -2, if th e d raw ing line is q u ite “bu m p y ” (i.e. TE/ F E h as
big v ariance), it’s not good f or w riting strategy eith er.
6.
Graph-3: P o o r D i s c
Th e d isc sh ow n in G rap h -3, w h ich neith er m eets req u irem ent
(1) nor (2), w ill alm ost encou nter h igh P I or P O F .
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BenQ Corporation
Storage Business Division
9th N ovem b er, 2 004 .
V er. 1.0
PART 2
B e n Q ’s Q S c a n
The R atio nal e B ehind Q S c an
F rom
ex p lanation in P art 1, w e know th at th e f inal bu rning q u ality not j u st relies on d riv e p erf orm ance, bu t also on th e
m ed ia th em selv es. H ow ev er, D V D m ed ia com e in v ariou s brand s and p rintings on th e m arket. F or m ost consu m ers, it’s
really d if f icu lt to tell good d iscs f rom
bad ones, and w h ich brand w ill best su it th eir ov er sp eed bu rning req u irem ents.
BenQ ’s Q S can p rov id es an intu itiv e grap h ic tool to h elp consu m ers id entif y TE/ F E ch aracteristics inf orm ation of th e
entire/ p artial D V D m ed ia.
Q S c an at a G l anc e
Below is th e U I ap p earance of Q S can. D etail d escrip tion is at nex t p age: “Q S can: Close-u p s”
C o m m an d b ar;
descrip tio n in th e
f o llo w in g sectio n
Step 1
Select target drive if m u ltip le
B en Q drives availab le
Step 2
Step 3
G et M I D in f o o f in serted
disc. N/ A is sh o w n if n o disc
in drive o r in f o u n k n o w n .
Availab le disc sp eed
su p p o rted b y target drive
Step 4
Step 5
T E an d FE scan o p tio n s.
Fo u r o p tio n s availab le:
No rm al (def au lt), Fu ll, Qu ick ,
an d Sm art Scan
En ab le/ disab le T E (4 5 0 ) an d
FE (5 0 0 ) criteria o n th e grap h
(T E an d FE
draw in g area)
Step 6
Statu s b ar. H in t o r drive actio n s
are sh o w n in b lack ; scan resu lts are
sh o w n in red (n o t reco m m en ded)
an d green (o k ).
2
BenQ Corporation
Storage Business Division
9th N ovem b er, 2 004 .
V er. 1.0
Q S c an: C l o se-U p s
S tep 1
S elect th e target D V D RW scan d riv e f rom “S elect D riv e”
if y ou h av e m u ltip le BenQ d riv es. Ex am p le 2-1 sh ow s th e
f irst d riv e u ses B7 M 9 f irm w are w ith inq u iry string of
“D V D D D D W1620 ”, th e second d riv e u ses B3H C
f irm w are w ith inq u iry string of “A TA P I D V D D U A L
8 x 4x 12”.
Ex am pl e 2-1
T w o B en Q D V D R W
drives p resen ted. Select f ro m
m en u .
S tep 2
I nsert D V D . Th e d isc inf o w ill sh ow in “D isc I nf o”
section; “n/ a” is sh ow n w h en no D V D p resented in d riv e
or d isc inf orm ation u nrecogniz ed like in Ex am p le 2-2-1.
Ex am pl e 2-2-1
( * Q Sc a n v . 1. 0 o n l y s u ppo r ts b l a n k DV D-R/ + R/ + R9 .
Su ppo r t to C DR/ C DRW / DV DRW / w r i tten d i s c s w i l l b e
a v a i l a b l e i n f u tu r e r el ea s e)
“n / a” m ean s th e M edia T y p e I D is
u n k n o w n to th e drive.
Ex am pl e 2-2-2
D i s c t y pe , M I D , an d o t he r d i s c
in fo is id e n tifie d .
S tep 3
“D isc S p eed ” sh ow s all av ailable d isc sp eed su p p orted by
selected target d riv e. I t m ay ex ceed claim ed d isc sp eed .
Ex am p le 2-3-1 sh ow s a claim ed 8 x D V D + R
( * Du e to th e B en Q DV DRW O v er -Speed f ea tu r e, s o m e d i s c i s
po s s i b l e to ex c eed i ts c l a i m ed s peed w h en b u r n i n g . )
Ex am pl e 2-3-1
A disc claim ed 8x can su p p o rt o ver
sp eed to 1 6x.
Ex am pl e 2-3-2
A d i s c c l ai m e d 4x c an s u ppo rt
o v e r s pe e d t o 12x .
S tep 4
F ou r scanning op tions are av ailable
(1) N orm al (D ef au lt): th is w ill scan th rou gh th e entire
d isc w ith norm al grap h d ensity . M easu red TE/ F E
w ill sh ow in th e grap h area. Th e resu lt w ill sh ow in a
d ialog w ind ow and in th e statu s bar.
Estim ate norm al scan tim e is 10 m inu tes f or a single
lay er (4.7 G B) d isc.
Ex am pl e 2-4-1
T E/ FE scan grap h th ru en tire disc w ith “No rm al” reso lu tio n .
3
BenQ Corporation
Storage Business Division
9th N ovem b er, 2 004 .
V er. 1.0
S tep 4
(2) F u ll: f u ll m od e scans th rou gh th e entire d isc w ith th e
h igh er grap h d ensity th an norm al. Com p are Ex am p le
4-1 and Ex am p le 4-2, w h ere th e sam e d isc is u sed . We
get h igh er resolu tion of TE/ F E m easu rem ent in th e
later one.
Estim ate f u ll scan tim e is 20 m inu tes f or a single lay er
(4.7 G B) d isc.
Ex am pl e 2-4-2
T E/ FE scan grap h th ru en tire disc w ith “Fu ll” reso lu tio n .
S tep 4
(3) Q u ick: q u ick m od e scans 1/ 10 ou ter tracks of th e
d isc. Becau se th e ou ter track of th e d isc w ill m ostly
ex p erience h igh P I and P O F , q u ick scan p rov id es an
initial j u d gm ent h ow th is d isc su p p orts d riv e w riting
strategy . F or + R9 (d ou ble lay er) d isc, th ere is a clear
d iv ision betw een lay er 1 and lay er 2 (as in Ex am p le
2-4-4).
L ay er 1
L ay er 2
Estim ate f u ll scan tim e is 2 m inu tes f or a single lay er
(4.7 G B) d isc, 4 m inu tes f or a d ou ble lay er (8 .5G B)
Ex am pl e 2-4-4
Ex am pl e 2-4-3
d isc.
Qu ick scan o f o u ter track f o r
sin gle lay er disc.
( * Ref er to F A Q #3 f o r c o n f i d en c e l ev el u s i n g Q u i c k s c a n )
Qu ick scan o f o u ter track f o r
do u b le lay er disc.
S tep 4
(4) “S m art S can”: th e “S m art M od e” bu tton in “S etting”
section scans only one ad d ress at th e d isc ou ter track
(w h ere TE/ F E error lev el u su ally gets h igh er) f or all
su p p orted d isc sp eed . “S m art M od e Rep ort” d ialog
w ill su m m ariz e th e scan resu lt f or each sp eed . Th is is
th e q u ickest w ay to go, bu t cannot d etect d iscs th at
h av e h igh TE and F E lev el in th e inner track.
( * Ref er to F A Q #3 f o r c o n f i d en c e l ev el u s i n g Sm a r t Sc a n )
Ex am pl e 2-4-5
Sm art Scan o f all availab le sp eed b y th e disc.
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BenQ Corporation
Storage Business Division
9th N ovem b er, 2 004 .
V er. 1.0
Fil e -> S av e
Q S can h as conv enient screensh ot f u nction and allow s
C ho o s e f ro m “S av e ”
t o k e e p s c re e n s ho t i n
y o u r c o m pu t e r.
M o d i f y s av i n g
l o c at i o n i n t he “S av e
A s ” w i n d o w s ho w n
o n t he ri g ht .
y ou to keep d isc scanning record s. Y ou can also create
sep arate f old ers
C ho o s e f ro m “H e l p”
t o g e t “A b o u t
Q S c an ” w i n d o w .
Fil e -> H el p
“A bou t Q S can” w ind ow p rov id es Q S can v ersion
inf orm ation and related w ebsite ad d resses. Y ou can
also f ind latest f irm w are v ersion and p rod u ct inf o
th rou gh th ese w ebsites.
5
BenQ Corporation
Storage Business Division
9th N ovem b er, 2 004 .
V er. 1.0
PART 3
1.
B e n e fit o f U s in g Q S c a n
E a s y to g e t M ID c o d e fo r b la n k d isc .
Sa m pl e d i s c #1
Sa m pl e d i s c #3
Sa m pl e d i s c #2
+ R 9 b y M K M
D V D + R b y I NFO M E
D V D + R b y M C C
Sa m pl e d i s c #4
D V D -R b y V D SP M S
2. E a s y t o e x p l o r e p o s s i b l e d i s c s p e e d t o s u p p o r t O v e r -S p e e d f e a t u r e o f B e n Q d r i v e , a l s o p r o v i d e c o n f i d e n c e o f b u r n i n g
u n d e r s e le c t e d s p e e d .
Sa m pl e d i s c #5
A claim ed 4 x D V D + R th at
can o ver sp eed to 1 2x.
B u rn in g at 1 2x is o k .
T E exceeds criteria at in n er track .
B u rn in g at 8x is n o t reco m m en ded.
B u rn in g at claim ed 4 x is o k .
B u rn in g at 1 6x is n o t
reco m m en ded.
B u rn in g at 1 2x is n o t
reco m m en ded.
B u rn in g at claim ed 8x is n o t
reco m m en ded.
Sa m pl e d i s c #6
A claim ed 8x D V D + R th at
can o ver sp eed to 1 6x
3. V e r i f y d i s c q u a l i t y v a r i a n c e i n t h e s a m e s p i n d l e : w h e n d i s c m a n u f a c t u r i n g p r o c e s s n o t w e l l c o n t r o l l e d , i t ’s v e r y l i k e l y
th a t th e s a m e s p in d le c o n ta in s d is c s o f la r g e T E /F E v a r ia n c e .
Sa m pl e d i s c #7 & 8
Sim ilar q u ality o f tw o ran do m ly selected
discs f ro m th e sam e sp in dle.
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BenQ Corporation
Storage Business Division
9th N ovem b er, 2 004 .
V er. 1.0
Sa m pl e d i s c #9 & 10
Qu ality varian ce o f tw o ran do m ly
selected discs f ro m th e sam e sp in dle.
4. V e r i f y d i s c q u a l i t y v a r i a n c e w i t h t h e s a m e M I D : s a m e d i s c m a k e r s o f t e n s e l l d i s c s w i t h d i f f e r e n t p r i n t i n g b a s e d o n
d i s c s g r a d e s o r m a r k e t i n g r e q u i r e m e n t . QS c a n c a n h e l p c o n s u m e r s t o s o r t o u t t h e r i g h t o n e t o b u r n .
Sa m pl e d i s c #11 & 12
D isc# 1 1 an d disc# 1 2 are m ade b y sam e
ven do r b u t w ith dif f eren ce p rin tin g.
Alth o u gh b o th o u ter track s exceeds
T E/ FE criteria, disc# 1 2 h as m o re stab le
lin e sh ap e co m p ared to disc# 1 1 .
PART 4
F AQ
Q1: H ow d oes Q S can d istingu ish d isc as " ok" or " not recom m end ed " u nd er selected sp eed ?
A1: TE and F E criteria setting of Q S can are: TE (50 0 ) and F E (450 ). Wh en th e m easu red TE or F E v alu e goes bey ond
d ef ined criteria at som e d isc location once, Q S can w ill d eterm ine th e d isc as “not recom m end ed ” f or bu rning u nd er
selected sp eed , becau se d isc w ill likely to encou nter w rite f ail or read f ail at th at ad d ress.
Resu lt: O K ,
TE/ F E v alu e m eets both (1) beneath criteria, (2) stable
line sh ap e. I f w riting strategy h as alread y been
f ine-tu ned on th is d isc, P I / P O w ill be good af ter
bu rning.
Graph 4-1
Resu lt: O K
Bu t TE/ F E v alu e only m eets (1) beneath criteria. Will
likely to h av e h igh P I at sp iked ad d ress.
Graph 4-2
Resu lt: N ot Recom m end ed
TE/ F E v alu e m eets neith er (1) beneath criteria or (2)
stable line sh ap e. Th is is th e kind of d isc w e d on’t w ant
to u se f or bu rning.
Graph 4-3
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BenQ Corporation
Storage Business Division
9th N ovem b er, 2 004 .
V er. 1.0
Q2: D oes d isc d eterm ined as " ok" gu arantee good P I / P O p erf orm ance?
A2: 1. Q S can only p rov id es " f itness ch ecku p " f or th e d isc itself . " P h y sically -f it" d iscs su ggest th at w riting strategy can be
better im p lem ented on th em . I f d iscs are innately u nf it, no m atter h ow good th e d riv e or w riting strategy is, th ey
are m ore op t to w rite f ail or read f ail.
2. M eanw h ile, ev en if a d isc is d eterm ined “ok”, it still need s to m eet th ree req u irem ents to h av e good P I / P O – (1)TE
and F E beneath criteria, (2) sm ooth line sh ap e, and (3) th e w riting strategy h as been f ine-tu ned on th e d isc
Q3: H ow reliable is each scan op tion?
A3: 1. Becau se ou ter tracks are w h ere h igh P I and P O F w ou ld m ostly occu r, “Q u ick” and “S m art S can” p rov id es
tim e-sav ing and rou gh j u d gm ent based on p artial ou ter track scanning. Bu t f rom
th e f ollow ing ex am p les, w e can
see th ere are still ch ances w h en p oor d iscs h av e TE/ F E ov er sp ec at inner tracks, bu t beneath sp ec at ou ter tracks.
Th eref ore “Q u ick” and “S m art M od e” m ay m isj u d ge a p oor d isc as good .
2. We su ggest if tim e p erm itted , ru n “N orm al” or “F u ll” to obtain th orou gh TE/ F E d iagnosis f or th e w h ole d isc. A
com p lete grap h w ill giv e u s better id ea at w h ich ad d ress th e w riting strategy w ill p robably f ail.
Q4: D oes Q S can su p p ort op tical d riv es of oth er v end ors?
A4: Q S can is ex clu siv e f or BenQ d riv es. I f y ou select non-BenQ d riv e, Q S can w ill f eed back th e f ollow ing w ind ow . A nd
all Q S can f u nctions w ill be inactiv e.
Graph 4-4 P o p-u p w i n d o w t o s ho w s e l e c t e d d ri v e d o e s n o t s u ppo rt Q S c an .
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BenQ Corporation
Storage Business Division
9th N ovem b er, 2 004 .
V er. 1.0
Q5: Wh en I p ress “S tart” to begin TE/ F E scanning, Q S can giv es m e “F irm w are not su p p orted . P lease f lash to latest
v ersion”. Wh at d oes th is w ind ow m ean and w h at sh ou ld I d o? ?
A5: I f th e f irm w are of y ou r BenQ d riv e d oes not su p p ort Q S can f u nction, y ou need to u p d ate th e f irm w are to latest
v ersion. P lease v isit h ttp :/ / su p p ort.benq .com / D ow nload Center to u p grad e y ou r d riv e w ith su itable f irm w are
v ersion.
Graph 4-5 P o p-u p w i n d o w t o s ho w d ri v e f i rm w are d o e s n o t s u ppo rt Q S c an .
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