No, one single Hard Disk couldn't fully use SATA III bandwidth, mainly because most hard disks producing bandwidth couldn't be previously mentioned 150MB/s, and reading through bandwidth couldn't be over 300MB/s, Therefore the SATA III 6Gb/s=6000Mb/s=6000/8MBps=750Bps could not be absolutely applied. Slower than NVMe: SATA drives are slower than other https://supertop-shop.com/sata-iii-hard-disk/