How To Check Disk Read Write Capacity . A read/write head floats above the spinning disk reading and writing data. Ssd versus hdd read/write speeds. How to Disable Write Protection of USB flash Drive Using CMD & Registry from www.itechfever.com While the file is still copying, open the task manager and go to the performance tab. Apart from using command prompt to launch check disk tool, you can also access it from the partition properties. And then click disk benchmark on the toolbar.