How to ensure Physical and Logical Sectors size are 4K

I have today received 3x WD10EARS to add to an existing WD10 EARS to create a RAID 10 array. I want to ensure both Physical and Logical sectors a re at 4k.

The existing WD10EARS is part of an existing array which has 3x WD10EARS at 512 Physical and 512 Logical and 1x WD10EARs at 4k Physical and 512 logical. Do I need to do anything before reintalling Win 7 to ensure the logical is at 4k?

Did you ever got any information about this?