thank you for your answer, Is there any cheaper solution? Can I change the format for the new HDD to be 512kb sector?
Nope, the layout can not be changed. If you want to mirror a 512KB/sector drive then you need an older 512KB/sector drive, no alternative. Just make sure that you don't get a 512E (note the 'E') drive, they are 4KB/sector drives with firmware that emulates the 512KB/sector layout. They may not work for your purposes.