Safely Remove Hardware Option has Gone

I have bought an Acer Aspire 4738Z recently. Every feature is working fine but experiencing a little yet annoying problem. I am using multiple USB devices and used to using the safely remove hardware icon in the taskbar to unplug any of the USB devices. But currently if I remove one of the devices then icon to remove hardware safely has disappeared magically.
I see no other options to remove the other devices. Now, how would I remove the remaining USB devices?
Can I just unplug the device, which could damage the device?
I don’t want to reboot every time to remove it.
Please give me a suggestion.
