I've install with Bootcamp Windows 8 then upgrade to Windows 8.1 and then upgrade to Windows 10.
When I want to relaunch the Bootcamp I've the error message : "The startup disk cannot be partitioned or restored to a single partition".
According do this page, this is due to Windows recovery partitions added during the migration from 8 to 8.1 and 8.1 to 10.
/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 Untitled 498.6 GB disk0s2
3: Apple_Boot Recovery HD 650.0 MB disk0s3
4: Apple_Boot Recovery HD 650.0 MB disk0s4
/dev/disk1 (external, physical):
#: TYPE NAME SIZE IDENTIFIER
0: FDisk_partition_scheme *16.1 GB disk1
1: DOS_FAT_32 USB 16.1 GB disk1s1
Alexiss-iMac:~ MGR$
