You can also try to do a backup of all your data, install Hard Disk Sentinel and try to do a surface test to see if there is some problem with the disk, and choose reinitialize disk surface to see if the values of transfer get any better.
You can also try to do a backup of all your data, install Hard Disk Sentinel and try to do a surface test to see if there is some problem with the disk, and choose reinitialize disk surface to see if the values of transfer get any better.