Hdd(hard drive) is cheaper storage drive because it work on moving material in the drive .On the otherhand SDD(solid state drive) is expensive as compare to hdd because it not have any moving material in the drive.
Profit of SDD: it is faster as compare to HDD.
Loss of SDD: it is very expensive as compare to HDD
Profit of HDD: it is cheaper as compare to SDD.
Loss of HDD: it is slower than SDD