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Scenario

Two drives are connected to a computer. One via a SATA-to-USB interface, the other directly via a SATA-to-eSATA cable.

The drive on USB appears as a removable drive, the drive on eSATA appears as a fixed drive. Both use NTFS.

The USB drive offers Bitlocker-To-Go, the eSATA drive only offers BitLocker.

Question

It is my understanding that drives encrypted with BitLocker-To-Go include an app to allow Windows XP read-only access to the volume. Is this the only difference, and is there a way to use Bitlocker-To-Go on the eSATA drive?

Update

Another difference is found here:

The recovery key is required when a BitLocker-protected fixed data drive configured for automatic unlocking is moved to another computer.[1]

Assuming that does not apply to removable drives.

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From my understanding Windows XP does not support Bitlocker in any fashion. –  Ramhound Oct 2 '12 at 17:37
    
@Ramhound - As I stated above, it possible to read (not write) to BitLocker FAT volumes on WinXP: microsoft.com/en-us/download/details.aspx?id=24303 –  Unsigned Oct 3 '12 at 2:39
    
I presume that "Install Windows 8" is not an option? –  Michael Hampton Oct 7 '12 at 22:05
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1 Answer 1

1) No, it is not the only difference. Fixed Bitlocker drives also have the option to automatically unlock if the OS drive is also encrypted. Removable drives must always be unlocked by using a password or smartcard.

2) I suspect if you apply this hotfix, windows will recognise the drive as a removable drive, and allow you to use Bitlocker to go. I don't think Windows will allow you to install Bitlocker to go on a drive it recognises as fixed. http://support.microsoft.com/kb/979344.

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Your first point seems to be incorrrect, Windows 7 currently allows me to automatically unlock my removable USB thumb drive. And yes, it does recognize it as a removable drive. –  Unsigned Oct 3 '12 at 2:40
    
1. Hmm, you're right. Perhaps the difference is that for fixed drives, there is no password needed if they are tied to the encryped OS drive, whereas for removable, you must at least type it once for each machine you connect it to. E.g. for a fixed drive tied to OS drive, if you move it, it will require the recovery key, not prompt for a password. 2. What does it recognise as removable? In your question you stated "the drive on eSATA appears as a fixed drive". –  Adam Millerchip Oct 3 '12 at 7:53
    
Any drive connected via USB, whether via a SATA/IDE-to-USB adapter (HDDs), or native USB (thumb drives), are recognized as removable. The HDD connected straight to the eSATA port is not. –  Unsigned Oct 3 '12 at 16:17
    
Have you installed the hotfix and tried again?. Also can you not just set up up while connected via USB, if that is your objective? –  Adam Millerchip Oct 3 '12 at 16:21
    
But if set up during USB, and then used via SATA (which makes Windows see it as fixed instead of removable), would that cause problems with unlocking the drive? –  Unsigned Oct 4 '12 at 1:20
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