hi i was using my windows 10 on Western Digital WD10EZEX 1TB Internal Hard Drive for last 3 years. it has 3 primary partitions and it's in MBR. today i clean installed my windows 10 on new mx500 ssd which is in GPT. now i wanna clean format one of the primary partition of my old HDD, but i dont wanna delete anything from other partitions of that HDD. whats the best way to do it? using command prompt or disk management?