Operating system ejectable SSD

Question

Why is my SSD, on which my operating system (Windows 7) is installed, showing as an ejectable device? I tried to eject it, half-expecting the drive to burst out of my case, but the device was - obviously - in use:

My other two mechanical hard drives are not on the list, and the SSD works fine otherwise.

Answer 1

SATA drives often show up as eject-able because the SATA protocol permits hot disconnection and reconnection of drives, and because Windows doesn't know what SATA ports are connected to internal drives and what ones are used for external (eSATA) drives.

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