Why don't PCs come with only USB-3 ports?

usb 3 slot
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If the USB port or cable has a blue tab, it is USB That said, it's possible for a USB port or cable to be a color other than blue See

usb 30 slot The red USB port is generally classified as USB , which was released in 2017 However, it can also be used to indicate a USB Gen 2 port

usb 20 slot Yes indeed, when the sandisk stick is inserted completely inside USB 3 Port is not recognized by any windows and