16gb pendrive no eject or safe to remove option

Which operating system ?

It's always a good practice to safely remove your USB flash drive before unplugging it from your computer.
This prevents data loss and extends the life of your external storage device.
Removing a flash drive from your computer is very easy and doesn't take a long time to do.

Close all files you accessed from the flash drive.
This is necessary for the device to be removed properly.
Don't forget to save your files before closing the files.
Right-click the "USB" icon marked with a checkmark.
It is located on the bottom right of your taskbar.
From the pop-up menu, click "Safely Remove Hardware."
A small window will be displayed.
Select the USB flash drive you want to unplug then click the "Stop" button.
A confirmation window will appear. Click the appropriate hardware device, then click "OK."
The "Safe to Remove Hardware" window will inform you that it's now safe to unplug the USB flash drive from your computer.
Click "OK," then click "Close."
or
Click start all programs accessories windows explorer navigate to your usb drive right click on it select remove or exit.