Help, not able to install win7 on new iMac

[frocco]

Hello,

I am the 1tb fusion drive and am installing via attached superdrive.
when the iMac reboots into windows setup, I get to the part where I select the partition.

I get a message that win7 cannot be installed because the partition is not formatted correctly.

I format the partition labeled BOOTCAMP and try to continue.

win7 says it cannot be installed on that partition.

These are the steps I did in the pas on an older iMac with no issues.

After formatting, the label BOOTCAMP disappears.

Thanks for the help.

Frank