'''Dell Inspiron M731R 5735''' '''Info'''
'''CPU''':AMD Dual/Quad Core A8 or A10 Series
'''Memory Type''':PC3-10600 1333MHz DDR3 SDRAM
'''Standard Memory''':up to 8GB
'''Max Memory''':8GB
'''Memory Expansion Slots''':2 SO-DIMM Slots
'''PC Card Slots''':None
'''USB Ports''':Two USB v3.0 Compliant Ports and Two USB 2.0 Compliant Ports
'''Firewire Ports''':None
'''Card Reader''':4-in-1 Media Card Reader (SD/SDHC/MS/MS-Pro)
'''Original Optical Drives''':DVD SuperMulti
'''Original Hard Drive(s)''':1TB 5400RPM SATA III 6Gb/s Hard Drive
There is no 1TB limit on any PC built today that uses 3.5" SATA II HDs.
If your system sees 2TB from a 4TB HDD, meaning you have initialized it as MBR , you may [https://www.partitionwizard.com/help/convert-MBR-disk-to-GPT-disk.html|convert MBR disk to GPT] that way.