diskutil list external /dev/disk2 (external, physical): #: TYPE NAME SIZE IDENTIFIER 0: GUID_partition_scheme *2.0 TB disk2 1: EFI EFI 209.7 MB disk2s1 2: Apple_APFS 2.0 TB disk2s2 /dev/disk3 (external, physical): #: TYPE NAME SIZE IDENTIFIER 0: GUID_partition_scheme *121.3 GB disk3 1: EFI EFI 314.6 MB disk3s1 2: Apple_APFS 121.0 GB disk3s2 sudo gpt -r show /dev/disk3 Password: start size index contents 0 1 PMBR 1 1 Pri GPT header 2 4 Pri GPT table 6 76800 1 GPT part - C12A7328-F81F-11D2-BA4B-00A0C93EC93B 76806 29545461 2 GPT part - 7C3457EF-0000-11AA-AA11-00306543ECAC 29622267 4 Sec GPT table 29622271 1 Sec GPT header sudo gpt -r show /dev/disk2 start size index contents 0 1 PMBR 1 1 Pri GPT header 2 32 Pri GPT table 34 6 40 409600 1 GPT part - C12A7328-F81F-11D2-BA4B-00A0C93EC93B 409640 3906619488 2 GPT part - 7C3457EF-0000-11AA-AA11-00306543ECAC 3907029128 7 3907029135 32 Sec GPT table 3907029167 1 Sec GPT header sudo dd if=/dev/disk3 bs=512 skip=76806 count=1 | hexdump 1+0 records in 1+0 records out 512 bytes transferred in 0.006785 secs (75461 bytes/sec) 0000000 e4bb e13b 3459 ca1e 12aa 18fc 87f2 1bf9 0000010 806f cc54 c0de c584 867c 818a d086 7deb 0000020 7687 04e0 114b b01f dedb c105 fd58 4f33 0000030 c858 0f6d 200f 6eb4 635f 8b86 9920 c5f5 0000040 a625 91da 46fb a2dd 7812 ac80 4a07 2630 0000050 c5b0 2c16 8c99 e13f 1395 a7d7 27da 812a 0000060 64a9 d72a 3fb1 4caa a595 7c3e 04a8 a29e 0000070 c99b e8fd 6066 9a36 b98a 069f 63fa dc53 0000080 608b 7d88 439e 5f5d 27df 27a0 1c1b fcbc 0000090 4e0b 18e2 ede8 fae2 14de 1fcd 4a43 23d8 00000a0 6f09 03df e868 e013 e163 4d5b 5ede 2008 00000b0 3ac8 ab33 18ad 04a9 cc08 c813 5bd5 b678 00000c0 0ebb cb91 bbe1 612e 3df6 2938 0825 3e26 00000d0 82c4 bab5 12e5 a782 9409 b038 eae2 1baf 00000e0 e841 76f3 8406 fdee 219a 77f4 71fc cbf1 00000f0 1066 eb12 0d7e d342 419b 8ae8 2db3 a840 0000100 d9d3 2196 eed4 8259 e0d0 5176 f508 a6fa 0000110 8429 e814 3850 9231 c0a0 1206 beb3 d598 0000120 4d4d 7d78 d5b0 9592 0330 4c6e 8873 ed91 0000130 0975 a1be 3cb4 d1db b2eb 815f 5ac7 57dd 0000140 c6b4 248f 18c7 3452 158f 75a1 d2ff c662 0000150 195f 039b f795 e561 b08f 7fb2 3563 9aea 0000160 bee5 c052 578f 9052 18be 2627 88ff 18b1 0000170 2b94 2524 1b41 2e4c 2fd5 360d 9b72 fe84 0000180 ef48 2ece 364a 7c20 4bf6 d342 ed48 e3b5 0000190 d26f 9806 0bfb 3c39 1883 f691 9535 98f6 00001a0 77a5 e970 ad04 9bd7 d398 a6a1 1739 8332 00001b0 c8cf 921a 1ba2 9038 093d 7e7b 4bee 4cc4 00001c0 d00f 2d76 8af9 cf51 d473 bec1 7d12 fc75 00001d0 8b00 4cbd b2c5 46ee e20c 06f3 786e 1074 00001e0 185a 4f65 8c18 3d5f 51bb aec9 e00b 516b 00001f0 15f2 a850 9cf8 be55 5fd1 403f 01be ddc5 0000200 sudo dd if=/dev/disk2 bs=512 skip=409600 count=1 | hexdump -Cv Password: 1+0 records in 1+0 records out 512 bytes transferred in 0.016025 secs (31950 bytes/sec) 00000000 14 d1 b1 38 3a 9a d0 b1 32 3a d6 47 c7 e5 e8 68 |...8:...2:.G...h| 00000010 43 27 7b 74 d2 a1 93 27 3a 75 47 a7 45 e8 74 09 |C'{t...':uG.E.t.| 00000020 9d 1d d1 39 00 9d 43 d0 79 36 3a ff 8e 2e 95 d0 |...9..C.y6:.....| 00000030 a5 2f ba cc 44 97 f9 e8 72 0f 5d 9e a0 6b 31 74 |./..D...r.]..k1t| 00000040 ad 8b ae c3 d0 75 2d ba 6e 42 d7 5d e8 7a 1c 5d |.....u-.nB.].z.]| 00000050 af a2 eb 23 74 7d 8b ae 0c b1 03 11 7b 05 dd 9a |...#t}......{...| 00000060 a1 db 33 74 af 8f ee bb d1 fd 20 ba 1f 43 f7 e7 |..3t...... ..C..| 00000070 e8 fe 06 dd 3f a1 bb 0d 3d 46 a2 c7 04 f4 98 82 |....?...=F......| 00000080 1e f7 d1 e3 39 7a bc 45 9c 13 e2 dc 11 67 44 5c |....9z.E.....gD\| 00000090 15 c4 f9 21 2e 1c 71 31 88 eb 89 b8 a1 88 a3 d2 |...!..q1........| 000000a0 cf e8 d9 1e 3d 57 a3 e7 6b c4 4b 88 2f 8f f8 aa |....=W..k.K./...| 000000b0 88 f7 45 fc 70 c4 8f 43 fc 0c c4 3f 41 2f 13 7a |..E.p..C...?A/.z| 000000c0 c5 a1 d7 4a f4 5a 8f 5e db d1 eb 14 7a 7b a3 77 |...J.Z.^....z{.w| 000000d0 18 7a 27 a0 77 7f f4 1e 8e de 13 d0 7b 1a 7a cf |.z'.w.......{.z.| 000000e0 41 ef eb e8 e3 89 3e 26 f4 e9 81 3e 69 e8 f3 3b |A.....>&...>i..;| 000000f0 12 2a 23 a1 1a 12 1a 20 21 08 09 11 48 88 42 42 |.*#.... !...H.BB| 00000100 67 24 c4 22 a1 37 12 06 21 61 14 12 26 22 e1 2e |g$.".7..!a..&"..| 00000110 12 1e 20 e1 25 12 de 23 21 17 09 05 e8 1b 8c be |.. .%..#!.......| 00000120 33 d0 f7 05 fa be 41 df 8f e8 fb 05 fd ea a1 9f |3.....A.........| 00000130 0f fa 05 a1 5f 4b f4 6b 8f 7e 73 d0 6f 09 fa d7 |...._K.k.~s.o...| 00000140 40 ff 68 f4 9f 81 fe 07 d0 ff 0d 06 74 c7 80 e7 |@.h.........t...| 00000150 18 f0 16 03 3e 60 c0 37 0c f8 0b 03 ed 30 50 8b |....>`.7.....0P.| 00000160 81 b1 18 b8 0e 03 b7 62 e0 1e 0c 3c 81 81 57 31 |.......b...<..W1| 00000170 f0 29 06 7e c5 20 09 83 0c 18 54 1e 83 6a 63 50 |.).~. ....T..jcP| 00000180 28 06 45 61 50 57 0c ea 8f 41 63 31 68 1a 06 2d |(.EaPW...Ac1h..-| 00000190 c4 a0 8d 18 74 11 83 1b 62 70 23 0c 6e 8a c1 31 |....t...bp#.n..1| 000001a0 18 dc 1d 83 fb 61 88 1e 43 46 61 c8 41 0c 35 61 |.....a..CFa.A.5a| 000001b0 68 33 0c dd 80 5f 74 f8 25 16 bf 3c c2 30 3f 0c |h3..._t.%..<.0?.| 000001c0 4b c2 b0 0d 18 96 8f e1 89 18 7e 00 23 ea 62 44 |K.........~.#.bD| 000001d0 2a 46 14 60 e4 38 8c 3c 8b 51 91 18 f5 1c a3 db |*F.`.8.<.Q......| 000001e0 63 f4 45 8c 91 30 66 08 c6 1c c6 58 07 8c 9d 82 |c.E..0f....X....| 000001f0 71 65 31 6e 1d c6 97 c7 f8 0d 98 50 19 13 d6 e1 |qe1n.......P....| 00000200 sudo dd if=/dev/disk2 bs=512 skip=409640 count=1 | hexdump -Cv dd: /dev/disk2: Input/output error 0+0 records in 0+0 records out 0 bytes transferred in 23.958603 secs (0 bytes/sec)