No, one particular single Hard Disk could not absolutely use SATA III bandwidth, simply because most hard disks creating bandwidth couldn't be earlier mentioned 150MB/s, and examining bandwidth could not be earlier mentioned 300MB/s, so the SATA III 6Gb/s=6000Mb/s=6000/8MBps=750Bps couldn't be absolutely utilised. During the Preliminary period of time following https://supertop-shop.com/sata-iii-hard-disk/