OK, Info below. I booted to 2 of my drives via standard MBR to E2B, choose the .imgPTN23 and rebooted to it via EFI, they both worked fine. So the imgPTN23 is working OK. I tried several .imgPTN23 files. All were OK.
I have the info below from 2 drives, the USB thumb drive I was using first, then a USB HDD that I tried the second time. Both produce the same error 'Problem making backup to LBA30' Both have been around the block a few times over the years too with various partition layouts as my E2B evolved. These two now are a NTFS first partition (size varies on media) , a 32 GB FAT 32 second partition type ( 0B on the HDD, 0C on the thumb) and the rest either a NTFS volume, or a RAW volume that is actually an encrypted partition. I added the partition info to the end of each from the RMPrep Disk Info output starting at sector 0.
HDD:
COMMAND LINE: DRIVE=2 USBINFO USBSTART=30 SURE
RMPARTUSB v2.1.747 (c)2019 RM Education plc [SSi]
=================================================
Accessing Drive 2 - "WD My Passport 07A8" (1,000,170,586,112 bytes)
Sector at LBA 30
============= SECTOR DATA ================
[Sector 30] 0MB
0000 00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00 ........ ........
0010 00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00 ........ ........
0020 00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00 ........ ........
0030 00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00 ........ ........
0040 00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00 ........ ........
0050 00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00 ........ ........
0060 00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00 ........ ........
0070 00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00 ........ ........
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 - 00 00 00 00 00 00 00 00 ........ ........
0100 00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00 ........ ........
0110 00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00 ........ ........
0120 00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00 ........ ........
0130 00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00 ........ ........
0140 00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00 ........ ........
0150 00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00 ........ ........
0160 00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00 ........ ........
0170 00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00 ........ ........
0180 00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00 ........ ........
0190 00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00 ........ ........
01A0 00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00 ........ ........
01B0 00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00 ........ ........
01C0 00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00 ........ ........
01D0 00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00 ........ ........
01E0 00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00 ........ ........
01F0 00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00 ........ ........
[Sector 31] 0MB
0200 00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00 ........ ........
0210 00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00 ........ ........
0220 00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00 ........ ........
0230 00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00 ........ ........
0240 00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00 ........ ........
0250 00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00 ........ ........
0260 00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00 ........ ........
0270 00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00 ........ ........
0280 00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00 ........ ........
0290 00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00 ........ ........
02A0 00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00 ........ ........
02B0 00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00 ........ ........
02C0 00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00 ........ ........
02D0 00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00 ........ ........
02E0 00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00 ........ ........
02F0 00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00 ........ ........
0300 00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00 ........ ........
0310 00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00 ........ ........
0320 00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00 ........ ........
0330 00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00 ........ ........
0340 00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00 ........ ........
0350 00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00 ........ ........
0360 00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00 ........ ........
0370 00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00 ........ ........
0380 00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00 ........ ........
0390 00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00 ........ ........
03A0 00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00 ........ ........
03B0 00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00 ........ ........
03C0 00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00 ........ ........
03D0 00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00 ........ ........
03E0 00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00 ........ ........
03F0 00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00 ........ ........
========= END OF SECTOR DATA ================
Drive 2 WD My Passport 07A8 F/W Rev.=1049 Serial No.=07A8WXQ1 [ bytes = 30 37 41 38 57 58 51 31 ]
Reported size 1,000,170,586,112 bytes (931.4814GiB) Last LBA 1,953,458,175
RMPrepUSB Max 1,000,161,146,880 bytes (931.4726GiB) Last LBA 1,953,439,739
Partition Info
Disk Signature bytes (1B8h-1BBh) = 17 52 90 48
Partition 1 SIZE=61440MiB Type: 07 NTFS\exFAT *ACTIVE*
START POS = CYL:0 HD:32 SEC:33 END POS = CYL:1023 HD:254 SEC:63
START (LBA) = 2,048 (00000800) SIZE (LBA) = 125,829,120 (07800000) [End=125,831,167]
Partition 2 SIZE=30442MiB Type: 0B FAT32 (2047GB max)
START POS = CYL:1023 HD:254 SEC:63 END POS = CYL:1023 HD:254 SEC:63
START (LBA) = 125,831,168 (07800800) SIZE (LBA) = 62,345,216 (03B75000) [End=188,176,383]
Partition 3 SIZE=861953MiB Type: 07 NTFS\exFAT
START POS = CYL:1023 HD:254 SEC:63 END POS = CYL:1023 HD:254 SEC:63
START (LBA) = 188,176,384 (0B375800) SIZE (LBA) = 1,765,279,744 (69380800) [End=1,953,456,127]
Partition 4 SIZE=514.594MiB Type: 00
START POS = CYL:1023 HD:117 SEC:32 END POS = CYL:1023 HD:15 SEC:55
START (LBA) = 55,977,862 (03562786) SIZE (LBA) = 1,053,888 (001014C0) [End=57,031,749]
P1 Start=2,048 (1,048,576 bytes) End=125,831,167 (64,425,557,504 bytes)
P2 Start=125,831,168 (64,425,558,016 bytes) End=188,176,383 (96,346,308,096 bytes)
P3 Start=188,176,384 (96,346,308,608 bytes) End=1,953,456,127 (1,000,169,537,024 bytes)
Drive 2 WD My Passport 07A8 F/W Rev.=1049 Serial No.=07A8WXQ1 [ bytes = 30 37 41 38 57 58 51 31 ]
Reported size 1,000,170,586,112 bytes (931.4814GiB) Last LBA 1,953,458,175
RMPrepUSB Max 1,000,161,146,880 bytes (931.4726GiB) Last LBA 1,953,439,739
Thumb:
COMMAND LINE: DRIVE=2 USBINFO USBSTART=30 SURE
RMPARTUSB v2.1.747 (c)2019 RM Education plc [SSi]
=================================================
Accessing Drive 2 - "SanDisk Extreme Pro" (256,087,425,024 bytes)
Sector at LBA 30
============= SECTOR DATA ================
[Sector 30] 0MB
0000 33 C0 EB 5C 90 00 00 00 - 00 00 00 00 00 00 00 00 3Àë\... ........
0010 00 00 00 00 00 00 00 00 - 00 00 00 00 78 79 4E 00 ........ ....xyN.
0020 00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00 ........ ........
0030 00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00 ........ ........
0040 00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00 ........ ........
0050 00 00 00 00 00 00 00 00 - 00 00 80 00 20 39 FF FF ........ ..€. 9ÿÿ
0060 31 DB 8E D3 BC 80 05 E8 - 00 00 5B 81 EB 6A 00 C1 1ÛŽÓ¼€.è ..[ëj.Á
0070 EB 04 8C C8 01 C3 53 68 - 7B 00 CB 68 00 20 17 BC ë.ŒÈ.ÃSh {.Ëh. ¼
0080 00 90 80 FA 00 74 02 B2 - 80 16 07 B0 10 30 F6 31 .€ú.t.² €.°0ö1
0090 DB E8 C2 00 72 29 0E 1F - 31 F6 31 FF B9 DF 00 FC ÛèÂ.r) 1ö1ÿ¹ß.ü
00A0 F3 A5 BB FC 1F 66 B8 47 - 52 55 AA 66 39 07 75 03 ó¥»üf¸G RUªf9.u.
00B0 E8 98 19 EA B8 00 00 20 - 16 1F 66 39 07 74 1F 80 è˜ê¸.. f9.t€
00C0 F2 80 68 C0 07 07 B0 10 - 30 F6 31 DB E8 87 00 72 ò€hÀ..° 0ö1Ûè‡.r
00D0 05 EA 00 00 C0 07 BE 92 - 01 E8 AF 00 EB FE BE BE .ê..À.¾’ .è¯.ëþ¾¾
00E0 01 E8 04 10 F6 06 A4 01 - 80 0F 84 6C 19 83 C6 0C .è.ö.¤. €„lƒÆ.
00F0 81 FE FE 01 72 EB 77 2D - F6 06 A7 01 01 0F 85 1E þþ.rëw- ö.§..…
0100 17 80 0E A7 01 01 F6 06 - A7 01 02 75 D4 68 00 0D €§..ö. §..uÔh..
0110 07 B0 04 31 D2 31 DB E8 - 3C 00 73 C2 BE AD 1C E8 .°.1Ò1Ûè <.s¾è
0120 69 00 E9 FA 16 F6 06 A7 - 01 01 0F 85 F1 16 80 0E i.éúö.§ ..…ñ€
0130 A7 01 01 E9 D2 16 1E 06 - 52 56 57 55 F9 CD 13 5D §..éÒ. RVWUùÍ]
0140 5F 5E 5A 07 1F C3 FA B8 - 00 20 8E D0 BC DC 8F FB _^Z.Ãú¸ . ŽÐ¼Üû
0150 66 61 07 1F EB 97 B4 02 - BF 03 00 B9 01 00 60 50 fa.ë—´. ¿..¹..`P
0160 53 51 FE C8 00 C1 D0 E0 - 00 C7 B0 01 E8 C7 FF 59 SQþÈ.ÁÐà .Ç°.èÇÿY
0170 5B 58 72 04 FE C8 75 E7 - 61 73 0B 60 31 C0 E8 B5 [Xr.þÈuç as.`1Àèµ
0180 FF 61 4F 75 D9 F9 C3 B4 - 0E CD 10 2E AC 3C 00 75 ÿaOuÙùô Í.¬<.u
0190 F6 C3 0D 0A 4D 69 73 73 - 69 6E 67 20 68 65 6C 70 öÃ..Miss ing help
01A0 65 72 2E 00 00 3F FF 00 - 00 00 00 00 00 00 00 00 er...?ÿ. ........
01B0 00 00 00 00 00 00 00 00 - 91 48 24 EC 00 00 80 20 ........ ‘H$ì..€
01C0 21 00 07 FE FF FF 00 08 - 00 00 00 00 80 07 00 FE !..þÿÿ.. ....€..þ
01D0 FF FF 0C FE FF FF 00 08 - 80 07 00 D0 A8 03 00 FE ÿÿ.þÿÿ.. €..Ш..þ
01E0 FF FF 07 FE FF FF 00 D8 - 28 0B 00 28 A7 12 00 00 ÿÿ.þÿÿ.Ø (..(§..
01F0 00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 55 AA ........ ......Uª
[Sector 31] 0MB
0200 33 C0 EB 5C 90 00 00 00 - 00 00 00 00 00 00 00 00 3Àë\... ........
0210 00 00 00 00 00 00 00 00 - 00 00 00 00 78 79 4E 00 ........ ....xyN.
0220 00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00 ........ ........
0230 00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00 ........ ........
0240 00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00 ........ ........
0250 00 00 00 00 00 00 00 00 - 00 00 80 00 20 39 FF FF ........ ..€. 9ÿÿ
0260 31 DB 8E D3 BC 80 05 E8 - 00 00 5B 81 EB 6A 00 C1 1ÛŽÓ¼€.è ..[ëj.Á
0270 EB 04 8C C8 01 C3 53 68 - 7B 00 CB 68 00 20 17 BC ë.ŒÈ.ÃSh {.Ëh. ¼
0280 00 90 80 FA 00 74 02 B2 - 80 16 07 B0 10 30 F6 31 .€ú.t.² €.°0ö1
0290 DB E8 C2 00 72 29 0E 1F - 31 F6 31 FF B9 DF 00 FC ÛèÂ.r) 1ö1ÿ¹ß.ü
02A0 F3 A5 BB FC 1F 66 B8 47 - 52 55 AA 66 39 07 75 03 ó¥»üf¸G RUªf9.u.
02B0 E8 98 19 EA B8 00 00 20 - 16 1F 66 39 07 74 1F 80 è˜ê¸.. f9.t€
02C0 F2 80 68 C0 07 07 B0 10 - 30 F6 31 DB E8 87 00 72 ò€hÀ..° 0ö1Ûè‡.r
02D0 05 EA 00 00 C0 07 BE 92 - 01 E8 AF 00 EB FE BE BE .ê..À.¾’ .è¯.ëþ¾¾
02E0 01 E8 04 10 F6 06 A4 01 - 80 0F 84 6C 19 83 C6 0C .è.ö.¤. €„lƒÆ.
02F0 81 FE FE 01 72 EB 77 2D - F6 06 A7 01 01 0F 85 1E þþ.rëw- ö.§..…
0300 17 80 0E A7 01 01 F6 06 - A7 01 02 75 D4 68 00 0D €§..ö. §..uÔh..
0310 07 B0 04 31 D2 31 DB E8 - 3C 00 73 C2 BE AD 1C E8 .°.1Ò1Ûè <.s¾è
0320 69 00 E9 FA 16 F6 06 A7 - 01 01 0F 85 F1 16 80 0E i.éúö.§ ..…ñ€
0330 A7 01 01 E9 D2 16 1E 06 - 52 56 57 55 F9 CD 13 5D §..éÒ. RVWUùÍ]
0340 5F 5E 5A 07 1F C3 FA B8 - 00 20 8E D0 BC DC 8F FB _^Z.Ãú¸ . ŽÐ¼Üû
0350 66 61 07 1F EB 97 B4 02 - BF 03 00 B9 01 00 60 50 fa.ë—´. ¿..¹..`P
0360 53 51 FE C8 00 C1 D0 E0 - 00 C7 B0 01 E8 C7 FF 59 SQþÈ.ÁÐà .Ç°.èÇÿY
0370 5B 58 72 04 FE C8 75 E7 - 61 73 0B 60 31 C0 E8 B5 [Xr.þÈuç as.`1Àèµ
0380 FF 61 4F 75 D9 F9 C3 B4 - 0E CD 10 2E AC 3C 00 75 ÿaOuÙùô Í.¬<.u
0390 F6 C3 0D 0A 4D 69 73 73 - 69 6E 67 20 68 65 6C 70 öÃ..Miss ing help
03A0 65 72 2E 00 00 3F FF 00 - 00 00 00 00 00 00 00 00 er...?ÿ. ........
03B0 00 00 00 00 00 00 00 00 - 48 90 BA 00 00 00 80 FE ........ Hº...€þ
03C0 FF FF 0C FE FF FF 48 90 - BA 00 76 B0 10 00 00 FE ÿÿ.þÿÿH º.v°..þ
03D0 FF FF 0C FE FF FF 00 08 - 80 07 00 D0 A8 03 00 FE ÿÿ.þÿÿ.. €..Ш..þ
03E0 FF FF 07 FE FF FF 00 D8 - 28 0B 00 28 A7 12 00 00 ÿÿ.þÿÿ.Ø (..(§..
03F0 00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 55 AA ........ ......Uª
========= END OF SECTOR DATA ================
Drive 2 SanDisk Extreme Pro F/W Rev.=0 Serial No.= [ bytes = 00 00 00 00 00 00 00 00 ]
Reported size 256,087,425,024 bytes (238.5GiB) Last LBA 500,170,751
RMPrepUSB Max 256,077,642,240 bytes (238.4908GiB) Last LBA 500,151,644
Partition Info:
Disk Signature bytes (1B8h-1BBh) = 91 48 24 EC
Partition 1 SIZE=61440MiB Type: 07 NTFS\exFAT *ACTIVE*
START POS = CYL:0 HD:32 SEC:33 END POS = CYL:1023 HD:254 SEC:63
START (LBA) = 2,048 (00000800) SIZE (LBA) = 125,829,120 (07800000) [End=125,831,167]
Partition 2 SIZE=29978MiB Type: 0C FAT32LBA (2047GB max)
START POS = CYL:1023 HD:254 SEC:63 END POS = CYL:1023 HD:254 SEC:63
START (LBA) = 125,831,168 (07800800) SIZE (LBA) = 61,394,944 (03A8D000) [End=187,226,111]
Partition 3 SIZE=152805MiB Type: 07 NTFS\exFAT
START POS = CYL:1023 HD:254 SEC:63 END POS = CYL:1023 HD:254 SEC:63
START (LBA) = 187,226,112 (0B28D800) SIZE (LBA) = 312,944,640 (12A72800) [End=500,170,751]
Partition 4 SIZE=0MiB Type: 00
START POS = CYL:0 HD:0 SEC:0 END POS = CYL:0 HD:0 SEC:0
START (LBA) = 0 (00000000) SIZE (LBA) = 0 (00000000)
P1 Start=2,048 (1,048,576 bytes) End=125,831,167 (64,425,557,504 bytes)
P2 Start=125,831,168 (64,425,558,016 bytes) End=187,226,111 (95,859,768,832 bytes)
P3 Start=187,226,112 (95,859,769,344 bytes) End=500,170,751 (256,087,424,512 bytes)
Drive 2 SanDisk Extreme Pro F/W Rev.=0 Serial No.= [ bytes = 00 00 00 00 00 00 00 00 ]
Reported size 256,087,425,024 bytes (238.5GiB) Last LBA 500,170,751
RMPrepUSB Max 256,077,642,240 bytes (238.4908GiB) Last LBA 500,151,644