This can happen with SATA II drives which you can actually remove on the fly – if you ever wanted to unplug one!
Here are a couple of solutions:
If you have a Nforce4 Based Motherboard and your sata drives are showing up in Safely Remove Hardware, this registry hack will allow you to fix it.
1. Click Start -> Run
2. Execute regedit
3. Navigate to
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\nvata
4. Click Edit
5. Select New > DWORD value
6. Name this DWORD: DisableRemovable
7. Double click this new DWORD and set its value to one (1).
8. Close Regedit and reboot.
If that doesn't work, you can 'hide' any drive with a little program called USB DLM. It allows you to hide ANY type of drive, external or internal from the 'Safely Remove Hardware' dialog; it also allows you to assign letters to USB drives, and a lot of other useful stuff and is FREE.
You can find the software at:
http://www.uwe-sieber.de/usbdlm_e.html
Download it and read help file at:
http://www.uwe-sieber.de/usbdlm_help_e.html
Search for "safely" and you will find the directions on how to hide the drives.
Hope that helps.