/dev/disk0 (internal, physical):
#: TYPE NAME SIZE IDENTIFIER
0: GUID_partition_scheme *500.1 GB disk0
1: EFI EFI 209.7 MB disk0s1
2: Apple_HFS Macintosh HD 389.8 GB disk0s2
3: Apple_Boot Recovery HD 650.0 MB disk0s3
4: Apple_HFS WIN INSTALL 5.9 GB disk0s4
5: Microsoft Reserved 16.8 MB disk0s5
6: Microsoft Basic Data BOOTCAMP 103.3 GB disk0s6
/dev/disk1 (external, physical):
#: TYPE NAME SIZE IDENTIFIER
0: GUID_partition_scheme *3.0 TB disk1
1: EFI EFI 209.7 MB disk1s1
2: Apple_HFS Mac 502.4 GB disk1s2
3: Microsoft Basic Data Windows 2.5 TB disk1s3
There is the output, WIN INSTALL is the 3rd partition I was talking about.