No, one solitary Hard Disk couldn't thoroughly use SATA III bandwidth, since most hard disks crafting bandwidth couldn't be over 150MB/s, and reading through bandwidth couldn't be earlier mentioned 300MB/s, And so the SATA III 6Gb/s=6000Mb/s=6000/8MBps=750Bps could not be totally utilised. Stack Exchange community contains 181 Q&A communities which include https://supertop-shop.com/sata-iii-hard-disk/