I see what is happening. The offsets of each section are being shifted by 0x6, 0xC, 0x12, 0x18, or 0x1E bytes (multiples of 6).
For example, here is section 43 from 02.bin (normal) and 027SX (shifted by 0x1E):
Code:
Section 43 Length 91 bytes
Addr 00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F
0000 00 01 00 C8 00 00 00 40 00 00 00 00 00 64 00 00 .......@.....d..
0010 00 00 08 08 08 08 00 00 00 08 10 0A 50 00 E8 03 ............P...
0020 00 00 1E 00 00 00 FF FF FF FF A0 0F A0 0F 00 00 ................
0030 1E 00 06 00 32 00 00 00 02 00 00 02 3C 00 00 00 ....2.......<...
0040 01 44 00 A0 00 00 00 00 40 00 00 00 10 00 00 00 .D......@.......
0050 00 3C 01 00 40 00 00 00 04 20 10 .<..@.... .
Code:
Section 43 Length 91 bytes
Addr 00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F
0000 00 78 00 00 00 32 00 00 00 40 1F 90 01 05 20 4E .x...2...@.... N
0010 D0 07 B4 00 0F 00 50 00 F4 01 F4 01 E8 03 00 01 ......P.........
^^
0020 00 C8 00 00 00 40 00 00 00 00 00 64 00 00 00 00 .....@.....d....
0030 08 08 08 08 00 00 00 08 10 0A 50 00 E8 03 00 00 ..........P.....
0040 1E 00 00 00 FF FF FF FF A0 0F A0 0F 00 00 1E 00 ................
0050 06 00 32 00 00 00 02 00 00 02 3C ..2.......<
WD's warranty checker identifies these drives as "Sagem Orange".