My WD goes to Sleep

Hi, i dont if this is normal in the WD My Passport Pro. The case is when i connect the device to the PC i can immediately copy and read any data. But if i dont use the device for more than 5 minutes i have to wait 20 seconds for access to the information.

What can i do to minimize this time. I want to access to the data without this delay.

My Device: My Passport Wireless Pro
Size: 4TB


Check the manual. It will go to sleep to save the battery charge.