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I'm using a laptop with TPM module with BitLocker-encrypted internal HDD, running Windows 7. Recently I've installed a Windows 8 on the external, eSATA drive. Windows 8 detected the Windows 7 and correctly replaced the bootloader with dual-boot option.

Unfortunately, I'm now forced to enter BitLocker Recovery Key each time I start the computer. The only workaround I've found was to disable TPM module in BIOS, and suspend BitLocker on the Windows 7 drive.

How to accomplish the following configuration:

  • Keep the BitLocker running on Windows 7 (internal drive)
  • Leave the Windows 8 (external, eSATA drive) completely unencrypted
  • Don't be bugged to enter Recovery Key each time during startup
  • No matter if the eSATA drive is plugged in, or not

Is it possible? I don't care if TPM is enabled and I just want the Windows 7 drive to be BitLocker-encrypted.

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up vote 4 down vote accepted

You need to log into Windows 7, suspend Bitlocker (no need to disable your TPM), then reboot your computer into Windows 7 again (and reenable Bitlocker if it doesn't automatically do it). This will "reset" Bitlocker to understand your new dual-boot configuration. Once you've done this, you should not need to enter your recovery key the next time you boot into Windows 7.

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This method also just worked for my upgraded Windows 10 computer. – BaronGrivet Aug 13 '15 at 21:43

One possible option, I certainly don't know if it is feasible for you or not would be to unencrypt the the Windows 7 partition, then encrypt again.

I Know, it takes forever and isn't a very attractive option but from what I understand, BitLocker is picky when it comes to user fiddling with disks after the fact.

The other thing I could suggest in hindsight would have been to disable BitLocker encryption temporarily while you installed Windows 8.

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