From SSD or memory hardware hw POV. A memory Byte (8 bits) is addressed using binary address (hw) conductors. So 10 address conductors is 2^^10=1024 call it KB. 20 address conductors is 2^^20=1048576 call it MB. 30 address conductors is 2^^30=1073741824 call it TB. The notation doesn’t change the exact number. There is no such thing as a 1,000,000,000 TB in computer memory.