1 (edited by ssjkakaroto 2007-12-13 16:37:36)

Topic: EAC pregap detection

Hi, I noticed that using EAC's detection Mode A and B give me completely different gap values. With mode A most gaps are 2 sec, using mode B they are usually non-integer and smaller than 2 sec.
Which one is the correct?

Also if the pregap is 2.01 what's its size?

TIA

Re: EAC pregap detection

Yes, you can use the cd dumping guide for PC games (as long as they don't have protections like SafeDisc or SecuROM). Same question answered here also: http://forum.redump.org/viewtopic.php?id=1998

Re: EAC pregap detection

Hey Vigi, you just answered my question before I edited it. I found that post right after I posted that one. Sorry tongue

Re: EAC pregap detection

Except for 1 drive which requires method B, all the others I have work right using method A.

Re: EAC pregap detection

The problem is that I'm getting inconsistent results with my 3 drives.
Plextor W2410A:
Track1 (data) pregap: 2.00
Track2 pregap: 2.01
Tracks3-22 pregaps: 2.00

NEC 3540A:
Tracks1-21 pregaps: 2.00
Track22 pregap: 1.74

LG 4521B:
Track1 pregap: 2.00
Track2 pregap: 2.02
Tracks3-22 pregaps: 2.00

What can I do in this case?

Re: EAC pregap detection

ssjkakaroto wrote:

The problem is that I'm getting inconsistent results with my 3 drives.
Plextor W2410A:
Track1 (data) pregap: 2.00
Track2 pregap: 2.01
Tracks3-22 pregaps: 2.00

NEC 3540A:
Tracks1-21 pregaps: 2.00
Track22 pregap: 1.74

LG 4521B:
Track1 pregap: 2.00
Track2 pregap: 2.02
Tracks3-22 pregaps: 2.00

What can I do in this case?

Ugh that's nasty. Which disc is it? Console or PC?

Re: EAC pregap detection

Hexen for PC (Made in Canada)

Re: EAC pregap detection

I really don't know, my disc reported all perfect 2.00 pregaps. Maybe someone knows more.

Re: EAC pregap detection

Do the tracks match the euro version checksums if dumped with 2.00 gap?

Re: EAC pregap detection

BTW I have the same problem with some SegaCD discs. There's a fault in either EAC or the drives.

Re: EAC pregap detection

gigadeath wrote:

BTW I have the same problem with some SegaCD discs. There's a fault in either EAC or the drives.

It's clear that EAC has gap issues, but the only solution that I know is to use perfectrip instead

Re: EAC pregap detection

Vigi wrote:

Do the tracks match the euro version checksums if dumped with 2.00 gap?

I only tested Track02 using the NEC and it didn't match (my SHA1 was F5183FBEE5B6794D70CC87C62D2E26BD6B31B02F).
I used a +270 based on this:

LBA :25036

0000 : D5 9D 9F 29 A8 1E FE 88  40 66 B0 2A F4 1F 07 48   ...)....@f.*...H
0010 : 02 B6 81 B6 E0 76 C8 26  D6 9A DE EB 18 4F 4A B4   .....v.&.....OJ.
0020 : 37 37 56 96 BE EE F0 4C  44 35 F3 57 05 FE 83 00   77V....LD5.W....
0030 : 61 C0 28 50 1E BC 08 71  C6 A4 52 FB 7D 83 61 A1   a.(P...q..R.}.a.
0040 : E8 78 4E A2 B4 79 B7 62  F6 A9 86 FE E2 C0 49 90   .xN..y.b......I.
0050 : 36 EC 16 CD CE D5 94 5F  2F 78 1C 22 89 D9 A6 DA   6......_/x."....
0060 : FA DB 03 1B 41 CB 70 57  64 3E AB 50 7F 7C 20 21   ....A.pWd>.P.| !
0070 : D8 18 5A 8A BB 27 33 5A  95 FB 2F 03 5C 01 F9 C0   ..Z..'3Z../.\...
0080 : 42 D0 31 9C 14 69 CF 6E  D4 2C 5F 5D F8 39 82 92   B.1..i.n.,_].9..
0090 : E1 AD 88 7D A6 A1 BA F8  73 02 A5 C1 BB 10 73 4C   ...}....s.....sL
00A0 : 25 F5 DB 07 1B 42 8B 71  A7 64 7A AB 63 3F 69 D0   %....B.q.dz.c?i.
00B0 : 2E DC 1C 59 C9 FA D6 C3  1E D1 C8 5C 56 B9 FE F2   ...Y.......\V...
00C0 : C0 45 90 33 2C 15 DD CF  19 94 0A EF 47 0C 32 85   .E.3,.......G.2.
00D0 : D5 A3 1F 39 C8 12 D6 8D  9E E5 A8 4B 3E B7 50 76   ...9.......K>.Pv
00E0 : BC 26 F1 DA C4 5B 13 7B  4D E3 75 89 E7 26 CA 9A   .&...[.{M.u..&..
00F0 : D7 2B 1E 9F 48 68 36 AE  96 FC 6E C1 EC 50 4D FC   .+..Hh6...n..PM.
0100 : 35 81 D7 20 5E 98 38 6A  92 AF 2D BC 1D B1 C9 B4   5.. ^.8j..-.....
0110 : 56 F7 7E C6 A0 52 F8 3D  82 91 A1 AC 78 7D E2 A1   V.~..R.=....x}..
0120 : 89 B8 66 F2 AA C5 BF 13  30 0D D4 05 9F 43 28 31   ..f.....0....C(1
0130 : DE 94 58 6F 7A AC 23 3D  D9 D1 9A DC 6B 19 EF 4A   ..Xoz.#=....k..J
0140 : CC 37 15 D6 8F 1E E4 08  4B 46 B7 72 F6 A5 86 FB   .7......KF.r....
0150 : 22 C3 59 91 FA EC 43 0D  F1 C5 84 53 23 7D D9 E1   ".Y...C....S#}..
0160 : 9A C8 6B 16 AF 4E FC 34  41 D7 70 5E A4 38 7B 52   ..k..N.4A.p^.8{R
0170 : A3 7D B9 E1 B2 C8 75 96  A7 2E FA 9C 43 29 F1 DE   .}....u.....C)..
0180 : C4 58 53 7A BD E3 31 89  D4 66 DF 6A D8 2F 1A 9C   .XSz..1..f.j./..
0190 : 0B 29 C7 5E D2 B8 5D B2  B9 B5 B2 F7 35 86 97 22   .).^..].....5.."
01A0 : EE 99 8C 6A E5 EF 0B 0C  07 45 C2 B3 11 B5 CC 77   ...j.....E.....w
01B0 : 15 E6 8F 0A E4 07 0B 42  87 71 A2 A4 79 BB 62 F3   .......B.q..y.b.
01C0 : 69 85 EE E3 0C 49 C5 F6  D3 06 DD C2 D9 91 9A EC   i....I..........
01D0 : 6B 0D EF 45 8C 33 25 D5  DB 1F 1B 48 0B 76 87 66   k..E.3%....H.v.f
01E0 : E2 AA C9 BF 16 F0 0E C4  04 53 43 7D F1 E1 84 48   .........SC}...H
01F0 : 63 76 A9 E6 FE CA C0 57  10 3E 8C 10 65 CC 2B 15   cv.....W.>..e.+.
0200 : DF 4F 18 34 0A 97 47 2E  B2 9C 75 A9 E7 3E CA 90   .O.4..G...u..>..
0210 : 57 2C 3E 9D D0 69 9C 2E  E9 DC 4E D9 F4 5A C7 7B   W,>..i....N..Z.{
0220 : 12 A3 4D B9 F5 B2 C7 35  92 97 2D AE 9D BC 69 B1   ..M....5..-...i.
0230 : EE F4 4C 47 75 F2 A7 05  BA 83 33 21 D5 D8 5F 1A   ..LGu.....3!.._.
0240 : B8 0B 32 87 55 A2 BF 39  B0 12 F4 0D 87 45 A2 B3   ..2.U..9.....E..
0250 : 39 B5 D2 F7 1D 86 89 A2  E6 F9 8A C2 E7 11 8A 8C   9...............
0260 : 67 25 EA 9B 0F 2B 44 1F  73 48 25 F6 9B 06 EB 42   g%...+D.sH%....B
0270 : CF 71 94 24 6F 5B 6C 3B  6D D3 6D 9D ED A9 8D BE   .q.$o[l;m.m.....
0280 : E5 B0 4B 34 37 57 56 BE  BE F0 70 44 24 33 5B 55   ..K47WV...pD$3[U
0290 : FB 7F 03 60 01 E8 00 4E  80 34 60 17 68 0E AE 84   ...`...N.4`.h...
02A0 : 7C 63 61 E9 E8 4E CE B4  54 77 7F 66 A0 2A F8 1F   |ca..N..Tw.f.*..
02B0 : 02 88 01 A6 80 7A E0 23  08 19 C6 8A D2 E7 1D 8A   .....z.#........
02C0 : 89 A7 26 FA 9A C3 2B 11  DF 4C 58 35 FA 97 03 2E   ..&...+..LX5....
02D0 : 81 DC 60 59 E8 3A CE 93  14 6D CF 6D 94 2D AF 5D   ..`Y.:...m.m.-.]
02E0 : BC 39 B1 D2 F4 5D 87 79  A2 A2 F9 B9 82 F2 E1 85   .9...].y........
02F0 : 88 63 26 A9 DA FE DB 00  5B 40 3B 70 13 64 0D EB   .c&.....[@;p.d..
0300 : 45 8F 73 24 25 DB 5B 1B  7B 4B 63 77 69 E6 AE CA   E.s$%.[.{Kcwi...
0310 : FC 57 01 FE 80 40 60 30  74 3D B8 80 48 64 36 AB   .W...@`0t=..Hd6.
0320 : 56 FF 7E C0 26 76 58 C9  0A 91 C7 2C 52 9D FD A9   V.~.&vX....,R...
0330 : 81 BE E0 70 48 24 36 9B  56 EB 7E CF 60 54 28 3F   ...pH$6.V.~.`T(?
0340 : 5E 90 38 6C 12 AD CD BD  95 B1 AF 34 7C 17 61 CE   ^.8l.......4|.a.
0350 : A8 54 7E BF 60 70 28 24  1E 9B 48 6B 76 AF 66 FC   .T~.`p($..Hkv.f.
0360 : 2A C1 DF 10 58 0C 3A 85  D3 23 1D D9 C9 9A 32 90   *...X.:..#....2.
0370 : E9 DE 48 54 36 BF 56 F0  3E C4 13 40 6C C9 F5 D1   ..HT6.V.>..@l...
0380 : 87 1C 62 89 E9 A6 CE FA  D4 43 1F 71 C8 24 56 9B   ..b......C.q.$V.
0390 : 7E EB 60 4F 68 34 2E 97  5C 6E B9 EC 72 CD E5 95   ~.`Oh4..\n..r...
03A0 : 8B 2F 27 5C 1A B9 CB 32  D7 55 9E BF 28 70 1E A4   ./'\...2.U..(p..
03B0 : 08 7B 46 A3 72 F9 E5 82  CB 21 97 58 6E BA AC 73   .{F.r....!.Xn..s
03C0 : 3D E5 D1 8B A4 35 18 F4  B6 CF 36 D4 16 DF 4E D8   =....5....6...N.
03D0 : 18 20 97 7B 2E A3 5C 79  F9 E2 C2 C9 91 96 EC 6E   . .{..\y.......n
03E0 : CD EC 55 8D FF 25 47 43  5F 18 B6 A7 2C 69 A3 21   ..U..%GC_...,i.!
03F0 : B9 D8 72 DA A5 9B 3B 2B  53 5F 7D F8 21 82 DC 04   ..r...;+S_}.!...
0400 : 4B B3 F6 3A 89 5F 78 0C  22 85 D9 A3 1A F9 CB 02   K..:._x.".......
0410 : D7 41 9E B0 68 74 2E A7  5C 7A D8 B4 E6 E2 8E 53   .A..ht..\z.....S
0420 : 31 97 D8 1C 5A 89 FB 26  C3 5A D1 FB 1C 43 49 F1   1...Z..&.Z...CI.
0430 : F6 C4 42 43 B5 14 0F 8F  00 00 00 00 00 00 00 00   ..BC............
0440 : 00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00   ................
...
Exact Audio Copy V0.99 prebeta 3 from 28. July 2007

EAC extraction logfile from 13. December 2007, 14:39

Unknown Artist / Unknown Title

Used drive  : _NEC    DVD_RW ND-3540A   Adapter: 0  ID: 2

Read mode               : Secure
Utilize accurate stream : Yes
Defeat audio cache      : Yes
Make use of C2 pointers : No

Read offset correction                      : 270
Overread into Lead-In and Lead-Out          : Yes
Fill up missing offset samples with silence : Yes
Delete leading and trailing silent blocks   : No
Null samples used in CRC calculations       : No
Used interface                              : Installed external ASPI interface
Gap handling                                : Appended to previous track

Used output format : Microsoft PCM Converter
Sample format      : 44.100 kHz, 16 Bit, Stereo


TOC of the extracted CD

     Track |   Start  |  Length  | Start sector | End sector 
    ---------------------------------------------------------
        1  |  0:00.00 |  5:35.61 |         0    |    25185   
        2  |  5:35.61 |  3:56.04 |     25186    |    42889   
        3  |  9:31.65 |  3:14.39 |     42890    |    57478   
        4  | 12:46.29 |  0:14.47 |     57479    |    58575   
        5  | 13:01.01 |  0:44.61 |     58576    |    61936   
        6  | 13:45.62 |  1:07.47 |     61937    |    67008   
        7  | 14:53.34 |  1:23.33 |     67009    |    73266   
        8  | 16:16.67 |  4:10.46 |     73267    |    92062   
        9  | 20:27.38 |  2:23.56 |     92063    |   102843   
       10  | 22:51.19 |  3:20.23 |    102844    |   117866   
       11  | 26:11.42 |  3:33.13 |    117867    |   133854   
       12  | 29:44.55 |  3:34.51 |    133855    |   149955   
       13  | 33:19.31 |  4:01.64 |    149956    |   168094   
       14  | 37:21.20 |  4:10.03 |    168095    |   186847   
       15  | 41:31.23 |  3:06.55 |    186848    |   200852   
       16  | 44:38.03 |  3:14.52 |    200853    |   215454   
       17  | 47:52.55 |  3:24.41 |    215455    |   230795   
       18  | 51:17.21 |  2:43.56 |    230796    |   243076   
       19  | 54:01.02 |  3:05.70 |    243077    |   257021   
       20  | 57:06.72 |  2:31.42 |    257022    |   268388   
       21  | 59:38.39 |  4:04.22 |    268389    |   286710   
       22  | 63:42.61 |  3:13.13 |    286711    |   301198   


Track  2

     Filename K:\Hexen\Unknown Artist - Track02.bin

     Pre-gap length  0:00:02.00

     Peak level 47.8 %
     Track quality 100.0 %
     Test CRC CD1BBCFB
     Copy CRC CD1BBCFB
     Copy OK

No errors occurred

End of status report

I'll test with my other drives later and post the results.

Re: EAC pregap detection

Gaps should be appended to next track

Null samples used in CRC calculations -> yes

Are C2 pointers not checked because your drive doesn't support them?

Re: EAC pregap detection

I guess I won't be able to dump games with audio tracks using my drives sad

fedd61624c09979c62b33fc878cdcbeab7600e04 ?SHA1*Track02_off228_lg.bin
217eefed775e2b187b674e66ab8a8fdb3eba1541 ?SHA1*Track02_off270_nec.bin
217eefed775e2b187b674e66ab8a8fdb3eba1541 ?SHA1*Track02_off270_pioneer.bin
787574096971516f6ab773e9f3ca4ad91c0dcc41 ?SHA1*Track02_off320_plex.bin

I got consistent results with a Pioneer 107D and a NEC 3540A but both of them report that track22 has a pregap of 1.74 and both my other drives and gigadeath's report it as having a 2.00 pregap sad

gigadeath: I don't enable C2 because there's no real advantage except speed and could lead to false good rips. AFAIK the only program that can properly use C2 pointers is dbpoweramp.

Re: EAC pregap detection

Vigi wrote:
gigadeath wrote:

BTW I have the same problem with some SegaCD discs. There's a fault in either EAC or the drives.

It's clear that EAC has gap issues, but the only solution that I know is to use perfectrip instead

My Plextor PX-W4824A arrived today (18 € well spent), and it works with PerfectRip! I tried it with Sonic CD and the dump matched.

And most important, PerfectRip correctly reads the pregap for 2 tracks Sega CDs, it reports 2.00 pregap instead of 0.00 fake one from EAC. EAC definitely doesn't work with all discs.