can't optimize external HDD for quick removal in Windows 7 HomePremium SP1



I seem to be unable to turn off hard disk caching for my USB drives in Windows 7. I used to be able to do this in XP, can't recall if it ever worked in Win 7. Can someone please explain how to get this working?

System details:
* SONY VAIO EB Series laptop
* Windows 7 Home Premium SP1
* Seagate Expansion Portable drive (USB, 1 TB)

Here are the steps to recreate:

1. Open My Computer
2. Right-click on the drive I want to optimize for quick removal. Note: compression and indexing are disabled.
3. Click the Hardware tab. Under "All disk drives", 4 drives are listed, including the USB drive we want to enable quick removal for:

Name Type
Seagate Expansion USB Device Disk drives
4. Click "Seagate Expansion USB Device" to select it
5. Click [Properties] button below. Properties window opens.
6. Click "Policies" tab.
7. Click "Quick removal (default)" radio button.
8. Click OK. A message pops up "Windows could not change the write-caching setting for the device. Your device might not support this feature or changing the setting."

The same thing happens when I try to enable quick removal through Disk Management. I am logged in with Administrator priveleges. Why is this happening and how can I get around it?


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