Disk Utility creates partition much larger than expected


hi,

i'm trying install boot camp on late 2013 27" imac (mavericks 10.9.5, 3.5ghz intel core i7, 1tb fusion, 16gb ram).

i'm using disk utility create new 80gb partition on internal 1tb fusion drive (technically 1.12tb). once disk utility has completed repartitioning, partition ends being around 200gb in size.

i've tried creating fat, exfat , mac os extended (journaled) in every case final partition ends being larger expected.

imac brand new, first switched on last night. filevault not enabled. i've installed boot camp on imac 1tb fusion drive , didn't have problem then. i'm using disk utility version 13.

ideas?
 

when select disk (in disk utility) , select "partition" tab - can't decrease partition size?
 


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