How much maximum hard disk capacity supported in Intel 945 types of motherboard?

All motherboards with the 915 chipset will have BiOSes that support LBA48 addressing. LBA48 supports a theoretical maximum of 144 petabytes (about 147,500 terabytes or 160,000,000 gigabytes). In other Words, any drive you could conceivably purchase within the next 30 years (assuming harddrive space increases at its current rate) will work.