Preventing ISO mount in Win2008 Servers

I noticed a lots of orphan drive letters attahed in Windows explorer.  They are not in Drive Manager though.  So I figured users mounting them with TrueCrypt.
First question - does it really required to mount a drive when encrypting/decrypting with TrueCrypt?
And, how to prevent this?  Group Policy or within the TrueCrypt app?
Thanks in advance!
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Tiras25Asked:
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David Johnson, CD, MVPConnect With a Mentor OwnerCommented:
you don't use truecrypt to mount .iso's you use it to mount encrypted volumes
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David Johnson, CD, MVPConnect With a Mentor OwnerCommented:
does it really required to mount a drive when encrypting/decrypting with TrueCrypt?

Yes as the operating system cannot access the 'drive' but must be forced to use the truecrypt driver.

These are usually mounted on the fly like when one plugs in a USB flash drive.

 poweriso, magiciso, etc will create 'virtual cdrom drives' that the user can then use to mount iso images.
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Tiras25Author Commented:
I understand ISO images. BUt for just for decrypting/encrypting files does it also require a drive mount?

No one plugs the USB drives there.  The servers are remote in the dta center and not physicallly accesible.
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David Johnson, CD, MVPConnect With a Mentor OwnerCommented:
1. Truecrypt not running no file mounted
Normal2. Truecrypt volume mounted
Truecrypt volume mounted3. When I unmount the truecrypt volume I then have picture #1
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Tiras25Author Commented:
Hmm mine are you staying there as just drives.  If I clicke on it says non-accessible..
Is there a way to prevent TrueCrypt mount drives?  Its only needed for mounting ISO for OS I understand.  If just to encrypt/decrypt not really needed?  
Otherwise the reboot is the only option get rid of those orphaned drives.
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Tiras25Author Commented:
I understand.My problem it doesnt get dismounted.
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