Sophos Disk Encryption Issue After Reformatting System Drive and Changing Computer Name

Question

Hi, Sophos Support Team 
 
 In our organization, Sophos full disk encryption has been started to be implemented in some of our user's laptop. 
 I have this situation wherein I reformatted the system drive of my laptop successfully but when I open 
 the other local drives such as D and E, it is now asking for recovery key. Recovery key is not a problem since 
 we have it in sophos central that can be retrieved any time. My problem is that I can no longer encrypt the system drive again 
 using Sophos disk encryption and other local drives keep on asking recovery key when I open it. Before I reformatted 
 the system drive, all drives are automatically unlocked every time I logged in to windows using my domain account. 
 When I try to install again the SophosInstall.exe, after installing, it fails to encrypt. 
 Any one who can help me on this will be highly appreciated. If there is a procedure on how to reformat a computer and change computer name 
 with sophos full disk encryption in placed, could you please share to me. 
 
 Laptop Details: 
 Windows 10 Pro 64Bit 
 Lenovo T440 
 1TB HDD 
 
 Thank you. 
 
 Cheers 
 
 Michael

Haridoss Sreenivasan · Answer

Hi Michael, 
 You have formatted the system drive while the other drives were still protected by BitLocker. You would have to decrypt the drives, format them and clear the TPM chip. You have to start the process again.