two write descriptors at same speed ?

[dodecahedron]

on my new LG GSA-H10A, media is TDK 8x DVD+R MID YUDEN000-T02-000,
weird thing in CDSpeed Create Disc: i have two 8x speed selections (see pic)! however in Nero, ImgBurn only on 8x to select from the speed pull-down menu.
burned a disc in each one, no big difference between them.

checked DVD Identifier, i get 2 write descrtiptors for 8x speed.
is this normal? to have more than 1 speed dscriptor for the same speed?
also, what is this "Method 1 not supported" ???

[15:05:05] DVD+R/+RW Medium Detected. Starting Identification...
[15:05:05] ** Initiating ADIP Retrieval Method 1 (Original ADIP)
[15:05:05] ERROR : ADIP Read M1 Failed : Illegal request - Invalid field in CDB [05/24/00]
[15:05:05] INFO : ADIP Read Method 1 Not Supported ; Method 2 Will Be Attempted
[15:05:05] ** Initiating ADIP Retrieval Method 2 (Copy Of ADIP)
[15:05:05] ADIP Read Method 2 Completed Without Errors
[15:05:05] Disc Identification Completed Successfully




** INFO : Drive = HL-DT-ST DVDRAM GSA-H10L - [FW LL11] - [ATAPI]
** INFO : Write Capabilities = DVD+R DVD+R-DL DVD+RW
** INFO : Write Capabilities = DVD-R DVD-R-DL DVD-RW DVD-RAM
** INFO : Disc = [DVD+R:YUDEN000-T02-000]
** INFO : Reference Speed : 1x DVD = 1385 kBps
** INFO : An Writeable Disc Is Recommended For Accurate Results
** INFO : Write Speeds (Supported By This Drive On This Disc) Listed Below

** INFO : GET PERFORMANCE Write Speed Descriptor(s)
Descriptor #1 = 16620 kBps (12.00x) - [CLV/Non-Pure CAV]
Descriptor #2 = 11081 kBps ( 8.00x) - [CLV/Non-Pure CAV]
Descriptor #3 = 11080 kBps ( 8.00x) - [CLV/Non-Pure CAV]
Descriptor #4 = 5540 kBps ( 4.00x) - [CLV/Non-Pure CAV]
Descriptor #5 = 3324 kBps ( 2.40x) - [CLV/Non-Pure CAV]

** INFO : MODE SENSE Write Speed Descriptor(s) [Legacy Command]
** WARNING : MODE SENSE Is Obsolete And Not Always Properly Supported
Descriptor #1 = 16620 kBps (12.00x) - [CLV/Non-Pure CAV]
Descriptor #2 = 11081 kBps ( 8.00x) - [CLV/Non-Pure CAV]
Descriptor #3 = 11080 kBps ( 8.00x) - [CLV/Non-Pure CAV]
Descriptor #4 = 5540 kBps ( 4.00x) - [CLV/Non-Pure CAV]
Descriptor #5 = 3324 kBps ( 2.40x) - [CLV/Non-Pure CAV]




** WARNING : Format 11h (Method 1) Is Recommended ADIP Retrieval Method
** WARNING : Format 00h (Method 2) Data Might Contain Drive Modified Values
** INFO : Hex Dump Of 'Media Code'-Block Listed Below
** INFO : 4-Byte Header Preceding 'Media Code'-Block Discarded
** INFO : Format 00h (Method 2) - Physical Information (Copy Of ADIP)
0000 : a1 0f 02 00 00 03 00 00 00 26 05 3f 00 00 00 00 .........&.?....
0010 : 00 00 03 59 55 44 45 4e 30 30 30 54 30 32 00 38 ...YUDEN000T02.8
0020 : 23 54 37 10 02 4e 72 02 8c 63 16 16 0b 0b 0a 0a #T7..Nr..c......
0030 : 01 19 1b 0c 0c 0c 0d 01 00 00 00 00 00 00 00 00 ................
0040 : 01 00 38 38 02 34 63 13 05 22 22 10 0e 12 12 01 ..88.4c.."".....
0050 : 00 00 02 34 63 13 05 22 22 10 0e 12 12 01 00 00 ...4c.."".......
0060 : 02 00 54 70 02 4e 64 4a 20 11 08 08 01 18 00 00 ..Tp.NdJ .......
0070 : 00 00 02 67 64 4e 20 10 08 08 01 18 00 00 00 30 ...gdN ........0
0080 : 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
0090 : 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
00a0 : 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
00b0 : 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
00c0 : 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
00d0 : 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
00e0 : 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
00f0 : 00 00 00 00 00 00 00 00 ........

[Ian]

I'm guessing one is for P-CAV and the other is Z-CLV. If I remember right, the drive uses Z-CLV with media rated at 8x. However, if you use media that would work at 12x or 16x but write at 8x, it uses P-CAV.