Main track part is padded with 0x00, gaps are padded with 0xFF, nothing special. Gaps padding is shifted by 1 sector, btw, so, the first sector of the gap is padded with 0x00, the 2nd sector of the gap is padded with 0xFF, the first sector of the track after the gap is padded with 0xFF, the next sector is padded with 0x00.
Confirmed. And the last 149 sector of the last track is also padded with 0xff.
And is 'NiGHTS into Dreams... (Japan)' irregular? Some sectors of the former pregap are also padded with 0xff in the all track.
:
LBA[098835, 0x18213]: P[00], Q[010301000943002159602402]{Audio, 2ch, Copy NG, Pre-emphasis No, Track[03], Idx[01], RMSF[00:09:43], AMSF[21:59:60]}, RtoW[0, 0, 0, 0]
LBA[098836, 0x18214]: P[00], Q[0103010009440021596153f7]{Audio, 2ch, Copy NG, Pre-emphasis No, Track[03], Idx[01], RMSF[00:09:44], AMSF[21:59:61]}, RtoW[0, 0, 0, 0]
LBA[098837, 0x18215]: P[ff], Q[01030100094500215962c9c5]{Audio, 2ch, Copy NG, Pre-emphasis No, Track[03], Idx[01], RMSF[00:09:45], AMSF[21:59:62]}, RtoW[0, 0, 0, 0]
LBA[098838, 0x18216]: P[ff], Q[010301000946002159633736]{Audio, 2ch, Copy NG, Pre-emphasis No, Track[03], Idx[01], RMSF[00:09:46], AMSF[21:59:63]}, RtoW[0, 0, 0, 0]
LBA[098839, 0x18217]: P[ff], Q[01030100094700215964ed80]{Audio, 2ch, Copy NG, Pre-emphasis No, Track[03], Idx[01], RMSF[00:09:47], AMSF[21:59:64]}, RtoW[0, 0, 0, 0]
LBA[098840, 0x18218]: P[ff], Q[010301000948002159659858]{Audio, 2ch, Copy NG, Pre-emphasis No, Track[03], Idx[01], RMSF[00:09:48], AMSF[21:59:65]}, RtoW[0, 0, 0, 0]
LBA[098841, 0x18219]: P[ff], Q[01030100094900215966026a]{Audio, 2ch, Copy NG, Pre-emphasis No, Track[03], Idx[01], RMSF[00:09:49], AMSF[21:59:66]}, RtoW[0, 0, 0, 0]
LBA[098842, 0x1821a]: P[ff], Q[01030100095000215967be6d]{Audio, 2ch, Copy NG, Pre-emphasis No, Track[03], Idx[01], RMSF[00:09:50], AMSF[21:59:67]}, RtoW[0, 0, 0, 0]
LBA[098843, 0x1821b]: P[ff], Q[01030100095100215968e5d3]{Audio, 2ch, Copy NG, Pre-emphasis No, Track[03], Idx[01], RMSF[00:09:51], AMSF[21:59:68]}, RtoW[0, 0, 0, 0]
LBA[098844, 0x1821c]: P[ff], Q[010301000952002159691b20]{Audio, 2ch, Copy NG, Pre-emphasis No, Track[03], Idx[01], RMSF[00:09:52], AMSF[21:59:69]}, RtoW[0, 0, 0, 0]
LBA[098845, 0x1821d]: P[ff], Q[010301000953002159703269]{Audio, 2ch, Copy NG, Pre-emphasis No, Track[03], Idx[01], RMSF[00:09:53], AMSF[21:59:70]}, RtoW[0, 0, 0, 0]
LBA[098846, 0x1821e]: P[ff], Q[01030100095400215971459c]{Audio, 2ch, Copy NG, Pre-emphasis No, Track[03], Idx[01], RMSF[00:09:54], AMSF[21:59:71]}, RtoW[0, 0, 0, 0]
LBA[098847, 0x1821f]: P[ff], Q[01030100095500215972dfae]{Audio, 2ch, Copy NG, Pre-emphasis No, Track[03], Idx[01], RMSF[00:09:55], AMSF[21:59:72]}, RtoW[0, 0, 0, 0]
LBA[098848, 0x18220]: P[ff], Q[01030100095600215973215d]{Audio, 2ch, Copy NG, Pre-emphasis No, Track[03], Idx[01], RMSF[00:09:56], AMSF[21:59:73]}, RtoW[0, 0, 0, 0]
LBA[098849, 0x18221]: P[ff], Q[01030100095700215974fbeb]{Audio, 2ch, Copy NG, Pre-emphasis No, Track[03], Idx[01], RMSF[00:09:57], AMSF[21:59:74]}, RtoW[0, 0, 0, 0]
LBA[098850, 0x18222]: P[ff], Q[010301000958002200004d76]{Audio, 2ch, Copy NG, Pre-emphasis No, Track[03], Idx[01], RMSF[00:09:58], AMSF[22:00:00]}, RtoW[0, 0, 0, 0]
LBA[098851, 0x18223]: P[ff], Q[01030100095900220001f706]{Audio, 2ch, Copy NG, Pre-emphasis No, Track[03], Idx[01], RMSF[00:09:59], AMSF[22:00:01]}, RtoW[0, 0, 0, 0]
LBA[098852, 0x18224]: P[ff], Q[0103010009600022000263f7]{Audio, 2ch, Copy NG, Pre-emphasis No, Track[03], Idx[01], RMSF[00:09:60], AMSF[22:00:02]}, RtoW[0, 0, 0, 0]
LBA[098853, 0x18225]: P[ff], Q[01030100096100220003d987]{Audio, 2ch, Copy NG, Pre-emphasis No, Track[03], Idx[01], RMSF[00:09:61], AMSF[22:00:03]}, RtoW[0, 0, 0, 0]
LBA[098854, 0x18226]: P[ff], Q[0103010009620022000447b2]{Audio, 2ch, Copy NG, Pre-emphasis No, Track[03], Idx[01], RMSF[00:09:62], AMSF[22:00:04]}, RtoW[0, 0, 0, 0]
LBA[098855, 0x18227]: P[ff], Q[01030100096300220005fdc2]{Audio, 2ch, Copy NG, Pre-emphasis No, Track[03], Idx[01], RMSF[00:09:63], AMSF[22:00:05]}, RtoW[0, 0, 0, 0]
LBA[098856, 0x18228]: P[ff], Q[01030100096400220006aa75]{Audio, 2ch, Copy NG, Pre-emphasis No, Track[03], Idx[01], RMSF[00:09:64], AMSF[22:00:06]}, RtoW[0, 0, 0, 0]
LBA[098857, 0x18229]: P[ff], Q[010301000965002200071005]{Audio, 2ch, Copy NG, Pre-emphasis No, Track[03], Idx[01], RMSF[00:09:65], AMSF[22:00:07]}, RtoW[0, 0, 0, 0]
LBA[098858, 0x1822a]: P[ff], Q[010301000966002200080f38]{Audio, 2ch, Copy NG, Pre-emphasis No, Track[03], Idx[01], RMSF[00:09:66], AMSF[22:00:08]}, RtoW[0, 0, 0, 0]
LBA[098859, 0x1822b]: P[ff], Q[01030100096700220009b548]{Audio, 2ch, Copy NG, Pre-emphasis No, Track[03], Idx[01], RMSF[00:09:67], AMSF[22:00:09]}, RtoW[0, 0, 0, 0]
LBA[098860, 0x1822c]: P[ff], Q[0103010009680022001053a9]{Audio, 2ch, Copy NG, Pre-emphasis No, Track[03], Idx[01], RMSF[00:09:68], AMSF[22:00:10]}, RtoW[0, 0, 0, 0]
LBA[098861, 0x1822d]: P[ff], Q[01030100096900220011e9d9]{Audio, 2ch, Copy NG, Pre-emphasis No, Track[03], Idx[01], RMSF[00:09:69], AMSF[22:00:11]}, RtoW[0, 0, 0, 0]
LBA[098862, 0x1822e]: P[ff], Q[01030100097000220012759c]{Audio, 2ch, Copy NG, Pre-emphasis No, Track[03], Idx[01], RMSF[00:09:70], AMSF[22:00:12]}, RtoW[0, 0, 0, 0]
LBA[098863, 0x1822f]: P[ff], Q[01030100097100220013cfec]{Audio, 2ch, Copy NG, Pre-emphasis No, Track[03], Idx[01], RMSF[00:09:71], AMSF[22:00:13]}, RtoW[0, 0, 0, 0]
LBA[098864, 0x18230]: P[ff], Q[0103010009720022001451d9]{Audio, 2ch, Copy NG, Pre-emphasis No, Track[03], Idx[01], RMSF[00:09:72], AMSF[22:00:14]}, RtoW[0, 0, 0, 0]
LBA[098865, 0x18231]: P[ff], Q[01030100097300220015eba9]{Audio, 2ch, Copy NG, Pre-emphasis No, Track[03], Idx[01], RMSF[00:09:73], AMSF[22:00:15]}, RtoW[0, 0, 0, 0]
LBA[098866, 0x18232]: P[ff], Q[01030100097400220016bc1e]{Audio, 2ch, Copy NG, Pre-emphasis No, Track[03], Idx[01], RMSF[00:09:74], AMSF[22:00:16]}, RtoW[0, 0, 0, 0]
LBA[098867, 0x18233]: P[ff], Q[010301001000002200176ad9]{Audio, 2ch, Copy NG, Pre-emphasis No, Track[03], Idx[01], RMSF[00:10:00], AMSF[22:00:17]}, RtoW[0, 0, 0, 0]
LBA[098868, 0x18234]: P[ff], Q[010301001001002200183167]{Audio, 2ch, Copy NG, Pre-emphasis No, Track[03], Idx[01], RMSF[00:10:01], AMSF[22:00:18]}, RtoW[0, 0, 0, 0]
LBA[098869, 0x18235]: P[ff], Q[01030100100200220019cf94]{Audio, 2ch, Copy NG, Pre-emphasis No, Track[03], Idx[01], RMSF[00:10:02], AMSF[22:00:19]}, RtoW[0, 0, 0, 0]
LBA[098870, 0x18236]: P[ff], Q[020000000000000000200517]{Audio, 2ch, Copy NG, Pre-emphasis No, MediaCatalogNumber [0000000000000], AMSF[ :20]}, RtoW[0, 0, 0, 0]
LBA[098871, 0x18237]: P[ff], Q[01030100100400220021b54a]{Audio, 2ch, Copy NG, Pre-emphasis No, Track[03], Idx[01], RMSF[00:10:04], AMSF[22:00:21]}, RtoW[0, 0, 0, 0]
LBA[098872, 0x18238]: P[ff], Q[010301001005002200222f78]{Audio, 2ch, Copy NG, Pre-emphasis No, Track[03], Idx[01], RMSF[00:10:05], AMSF[22:00:22]}, RtoW[0, 0, 0, 0]
LBA[098873, 0x18239]: P[ff], Q[010400000173002200234606]{Audio, 2ch, Copy NG, Pre-emphasis No, Track[04], Idx[00], RMSF[00:01:73], AMSF[22:00:23]}, RtoW[0, 0, 0, 0]
LBA[098874, 0x1823a]: P[ff], Q[010400000172002200249cb0]{Audio, 2ch, Copy NG, Pre-emphasis No, Track[04], Idx[00], RMSF[00:01:72], AMSF[22:00:24]}, RtoW[0, 0, 0, 0]
:
Various Saturn titles come to mind.
e.g. Puyo Puyo Sun? That is, "The first sector of the 2nd track's pregap is a scrambled data sector."?