i was just wondering what exactly is the difference between the SSD and the HDD in terms of speed.how is one better than the other and if the SSD is really that fast what should be put in it and why?.i don't understand what is it used for?
The key factors are faster access times/more data moved per second vs slower access time's/less data moved specificaly.
For example say you had a motherboard that was able to run Sata 6 standard drives they then would apply as follows:
HDD: 1 ms access time / max 145 mb/s burst transfer rate of data from the drive / sustained transfer data rate 9x mb/s max if that
SDD: .1 ms acess time / max 550 mb/s burst transfer rate of data from the drive / sustained transfer data rate 2xx mb/s