Why is my SATA Raptor listed in my system tray?

Can anyone explain to me why my SATA Raptor is listed in my system tray along with my external Maxtor OneTouch USB HDD? It's a little icon that says "safely remove hardware" if I hold my cursor over it. If I click on it it lists my SATA Raptor and my OneTouch. I know why my OneTouch is there but why is my primary HDD there? Is this normal? Did I not install something I should have or maybe installed the Raptor wrong? It's my only HDD and I have it plugged into SATA 1.
Thanks,

Could also be that SATA HD's are hot-swappable.
Steve
From WD:
I want to be able to connect or remove a drive without turning off the system. Is it safe to hot-plug WD serial ATA drives?
Serial ATA supports hot-plugging (also known as "hot-swapping"). This is the ability to swap out a failed hard drive without having to power down the system or reboot. This capability contributes to both data availability and serviceability without any associated downtime.
The Serial ATA 1.0 specification requires staggered pins for both the hard drive and drive receptacles. Staggered pins mate the power signals in the appropriate sequences required for powering up the hot-plugged device. These pins are also specified to handle in excess of the maximum allowed inrush current that occurs during drive insertion. SATA-compliant devices thus need no further modification to be hot-pluggable and provide the necessary building blocks for a robust hot-plug solution, which typically includes:
Device detection even with power downed receptacles (typical of server applications)
Pre-charging resistors to passively limit inrush current during drive insertion
Hot-plug controllers to actively limit inrush current during drive insertion

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