gpt show: /dev/disk0: mediasize=320072933376; sectorsize=512; blocks=625142448
gpt show: /dev/disk0: PMBR at sector 0
gpt show: /dev/disk0: Pri GPT at sector 1
gpt show: /dev/disk0: Sec GPT at sector 625142447
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 310964408 2 GPT part - 48465300-0000-11AA-AA11-00306543ECAC
311374048 1269536 3 GPT part - 426F6F74-0000-11AA-AA11-00306543ECAC
312643584 312498176 4 GPT part - EBD0A0A2-B9E5-4433-87C0-68B6B72699C7
625141760 655
625142415 32 Sec GPT table
625142447 1 Sec GPT headergpt show: /dev/disk0: mediasize=320072933376; sectorsize=512; blocks=625142448
gpt show: /dev/disk0: PMBR at sector 0
gpt show: /dev/disk0: Pri GPT at sector 1
gpt show: /dev/disk0: Sec GPT at sector 625142447
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 310964408 2 GPT part - 48465300-0000-11AA-AA11-00306543ECAC
311374048 1269536 3 GPT part - 426F6F74-0000-11AA-AA11-00306543ECAC
312643584 312498176 4 GPT part - EBD0A0A2-B9E5-4433-87C0-68B6B72699C7
625141760 655
625142415 32 Sec GPT table
625142447 1 Sec GPT header
for the second one you mentioned:
Disk: /dev/disk0 geometry: 38913/255/63 [625142448 sectors]
Signature: 0xAA55
Starting Ending
#: id cyl hd sec - cyl hd sec [ start - size]
------------------------------------------------------------------------
1: EE 1023 254 63 - 1023 254 63 [ 1 - 625142447] <Unknown ID>
2: 00 0 0 0 - 0 0 0 [ 0 - 0] unused
3: 00 0 0 0 - 0 0 0 [ 0 - 0] unused
4: 00 0 0 0 - 0 0 0 [ 0 - 0] unused