Question: why is mbr limited to 2tb?
Answer: MBR only works on 32-bit Windows systems. Thus, Storage Addressing is 32 bit, supporting an address range of 2^32 = 4G. ... Therefore, MBR Disk has a size limitation of 4G * 512 Bytes = 2TB. 64-bit Windows can only boot from GUID Partition Table (GPT) disks, which can be larger than 2TB.