where on my computer can i get the device folders plugged in to my computer (usb)?

If you plugged in a USB drive or any external device with a hard drive and wondered why you cannot see it in My Computer, ,more than likely the cause is that Windows renamed the drive to a letter that is already in use. This will happen if you have several card readers, thumb drives or external hard drives attached. It will also happen if you are on a network and have mapped drives. To find the drive and then rename it, you’ll want to right-click on My Computer and select Manage.
From the Computer Management screen, select Disk Management.
In this window you should see all of your connected physical drives, their format, if they are healthy, and the drive letter. Hope this helps!