I went through gdisk and deleted GPT 4 and recreated the new partition. Here are the results:
Command (? for help): i
Partition number (1-4): 4
Partition GUID code: EBD0A0A2-B9E5-4433-87C0-68B6B72699C7 (Microsoft basic data)
Partition unique GUID: 0995434D-76F6-4396-9856-59BFE981DE38
First sector: 1076355072 (at 513.2 GiB)
Last sector: 1465147384 (at 698.6 GiB)
Partition size: 388792313 sectors (185.4 GiB)
Attribute flags: 0000000000000000
Partition name: 'Microsoft basic data'
Command (? for help): p
Disk /dev/disk0: 1465149168 sectors, 698.6 GiB
Logical sector size: 512 bytes
Disk identifier (GUID): 00005C68-619F-0000-D655-00000D170000
Partition table holds up to 128 entries
First usable sector is 34, last usable sector is 1465149134
Partitions will be aligned on 8-sector boundaries
Total free space is 2956 sectors (1.4 MiB)
Number Start (sector) End (sector) Size Code Name
1 40 409639 200.0 MiB EF00 EFI system partition
2 409640 1075084335 512.4 GiB AF00 Customer
3 1075084336 1076353871 619.9 MiB AB00 Recovery HD
4 1076355072 1465147384 185.4 GiB 0700 Microsoft basic data
However, The headers are still the same and running dd looks like nothing changed:
dd:
Kentons-MacBook-Pro:~ Kenton$ sudo dd if=/dev/rdisk0s4 count=1 2>/dev/null | hexdump -C
00000000 b0 45 86 df 49 90 1e b1 47 20 96 de 2c 07 5b 63 |.E..I...G ..,.[c|
00000010 82 ce c1 49 db 66 cd 05 97 27 bf f2 cc 25 a4 0f |...I.f...'...%..|
00000020 f7 de fc 1f 1f 9c 11 12 67 60 74 23 b6 fd a4 55 |........g`t#...U|
00000030 c9 26 18 e9 74 ad 1d 90 4d 63 c4 67 17 62 1a e0 |.&..t...Mc.g.b..|
00000040 84 63 0e 68 0a 6f 0a ff 0b 71 79 96 54 7e fc bb |.c.h.o...qy.T~..|
00000050 21 67 4e d2 94 f8 cc 86 e2 90 7a a9 e5 6e ff 15 |!gN.......z..n..|
00000060 be 34 9c 8a 9f f4 5d b8 d2 17 1b f1 a7 7d 03 f9 |.4....]......}..|
00000070 d0 34 32 0b a2 58 4d a9 74 1d ab bb 55 6b ef d4 |.42..XM.t...Uk..|
00000080 eb c4 e4 eb e1 41 da 24 ae 24 17 d8 72 bf cb c7 |.....A.$.$..r...|
00000090 d3 53 6f 1b f1 93 aa a8 47 46 8f 4d 7a 20 83 75 |.So.....GF.Mz .u|
000000a0 e6 6d d2 53 2b a5 6c 6f e9 f1 0e 88 28 12 2d ff |.m.S+.lo....(.-.|
000000b0 12 71 05 88 af 5d 53 23 64 76 b6 fe b2 78 93 82 |.q...]S#dv...x..|
000000c0 ac 15 db 0a 65 34 5f 34 35 a6 23 82 7e 01 cc a3 |....e4_45.#.~...|
000000d0 cb b3 6d 21 93 f7 76 05 7e d0 f6 89 10 82 f7 01 |..m!..v.~.......|
000000e0 2c 26 77 de a1 6e 73 da a1 17 5d 2d 43 fc 47 71 |,&w..ns...]-C.Gq|
000000f0 ce 72 9a bc c3 52 73 a5 d4 b0 64 09 c5 36 29 6b |.r...Rs...d..6)k|
00000100 2b c3 9f 57 df 25 55 c5 df 03 ec 50 53 31 02 c4 |+..W.%U....PS1..|
00000110 da 6d fe c5 25 2b 54 ca e3 b5 6c 98 a6 0c 7e 7a |.m..%+T...l...~z|
00000120 8d 3c 3e 6d e6 b1 c6 88 98 cc f4 77 87 62 c4 d5 |.<>m.......w.b..|
00000130 f3 b6 3d 5b b9 15 ad 8e 3f 47 c1 55 68 ca 8f c5 |..=[....?G.Uh...|
00000140 70 91 ee af 0e c9 6e 43 f1 3a e9 f2 4a 6a fd 1e |p.....nC.:..Jj..|
00000150 09 77 d3 03 f9 22 ab bd a5 f5 83 96 e6 0c 4f a7 |.w..."........O.|
00000160 87 36 20 eb 1c a4 93 b5 7f 13 f8 ff 07 7c c1 d8 |.6 ..........|..|
00000170 3b d3 91 e5 b2 c9 87 1f d5 85 65 b6 58 ee b3 c2 |;.........e.X...|
00000180 29 09 14 93 4a f2 2f 04 f1 86 d0 7b c2 8e 77 63 |)...J./....{..wc|
00000190 c4 a6 f5 01 a5 d6 73 91 94 07 75 d7 f7 69 45 df |......s...u..iE.|
000001a0 32 11 ff 45 5c 66 20 3a 35 5a 6e 0c 58 55 f1 ae |2..E\f :5Zn.XU..|
000001b0 1e c0 b9 02 df 66 65 7b c6 8a d9 e5 0d 35 47 6d |.....fe{.....5Gm|
000001c0 24 b6 d3 4e 24 9f be 5e 48 31 25 78 9d fd 0b f7 |$..N$..^H1%x....|
000001d0 f5 c2 1b 04 61 2a cc 9c d0 e2 be eb 5c 65 21 7d |....a*......\e!}|
000001e0 06 c7 79 1e 55 eb 56 e2 e4 89 6c bc bc 1d e0 9f |..y.U.V...l.....|
000001f0 29 16 bf d8 4f 86 5a 10 df 88 d4 f3 cb 72 8c c3 |)...O.Z......r..|
00000200
Kentons-MacBook-Pro:~ Kenton$ sudo gpt -vv -r show /dev/disk0
gpt show: /dev/disk0: mediasize=750156374016; sectorsize=512; blocks=1465149168
gpt show: /dev/disk0: Suspicious MBR at sector 0
gpt show: /dev/disk0: Pri GPT at sector 1
gpt show: /dev/disk0: Sec GPT at sector 1465149167
start size index contents
0 1 MBR
1 1 Pri GPT header
2 32 Pri GPT table
34 6
40 409600 1 GPT part - C12A7328-F81F-11D2-BA4B-00A0C93EC93B
409640 1074674696 2 GPT part - 48465300-0000-11AA-AA11-00306543ECAC
1075084336 1269536 3 GPT part - 426F6F74-0000-11AA-AA11-00306543ECAC
1076353872 193483952
1269837824 195309568 4 GPT part - EBD0A0A2-B9E5-4433-87C0-68B6B72699C7
1465147392 1743
1465149135 32 Sec GPT table
1465149167 1 Sec GPT header
What am I doing wrong?