S.NO Metrices   HDD ( Hard Disk Drive) SDD( Solid State Drive)
1 Speed (SATA II) 65-85 MB/s, Slower speed compared to SSD 80-250 MB/s, Faster Speed compared to HDD
2 Size Larger compared to HDD Smaller compared to HDD ( Thats why preferred to be in case where data center s rent is very costly and you want to store  data with compact device).
3 Average Seek Time <10 ms 0
4 Noise Noisy because of presence of mechanical part. Not noisy because of absence of mechanical part.
5 Power Consumption 10 W , Generates more heat 2W> Low power consumption
6 Weight Heavier Light weight
7 Endurance MTBF < 7,00,000 hrs MTBF> 20,00,000
8 Reliability Non shock resistant Antishock
9 Shock & Vibration Poor Excellent