erase MacHD on HDD? not working


i want kill old macintosh hd partition on hdd. running of ssd now. works fine when disconnect hdd entirely, shouldn't problem delete old 1 (all data save).
doesn't seem work though. says (even in windows) in use , cannot unmounted.
want hdd become data disk , offer no bootable volumes cannot seem delete any. didn't try 2 ntfs volumes because still need data them. in windows shouldn't problem.

partitions this
macssd boots
winssd (x64 new) boots
macintosh hd boots if selected , doesn't let me unmount it
windows x86 none bootable, unmounts
bootcamp (x64 old) boots both hdd win partitions, unmounts

hdd spun down enter diskutility, spins , unmounting not allowed.

suggestions. step left can think of is. dave windows data. take out hdd put windows desktop , delete partitions there. seems extreme , have disassemble again.
tried delete whole partition in windows (boot winssd) next macssd startup though nothing ever happened.
 

solved.
found away force unmounting , erase it.
 


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