Win10 Bitlocker Drive Issue...Help?

[Dark54555]

I have two external drives I rotate as backup drives. Both are encrypted with BitLocker, and both worked fine in Windows 8.1. Since the upgrade to Windows 10 Pro, I can't access either one.

In "This PC," they both appear as a drive, they have the unlocked padlock and note as a "BitLocker" drive (the unlocked padlock implies the system remembered the correct password; it was stored in Win 8.1 before the upgrade). I can even change the BitLocker password without a problem; drive shows the unlocked icon on reconnecting.

Double clicking gives a "The parameter is incorrect" error. Disk Management shows the correct size for the disk and partition, says "Healthy." But the File System lists as "Unknown (BitLocker Encrypted)." Ran chkdsk on both from cmd, with no errors reported.

Kinda at a loss for what to do next other than wipe the drives and start over. Help please?

 

[LTC8K6]

If Windows.old is still on your Windows drive, you can just revert back to your 8.1 setup, and then perhaps you can undo bitlocker, then upgrade, then redo bitlocker for Win10?

 

[XavierMace]

Did you turn off Bitlocker before doing the upgrade?

 

[Dark54555]

So, in seeing what other systems I had laying around, I found an old netbook running Win7 Starter; it can open the drive just fine, but Win7 starter can't undo bitlocker. Looks like I may be trying to put Windows 8 on something I have laying around just to undo the bitlocker, then re-do it in Windows 10. Not sure why Win10 is having a problem like this.

 

[aviator79]

I have a fully encrypted Notebook, using BitLocker with an SED (Samsung 850 PRO). I can assure, that Windows 10 had no problems with BitLocker. I unlocked (paused) the encryption, upgraded from 8.1 to 10. After that I reenabled (resumed) BitLocker. Worked fine!
But you have a slightly different issue. Hard to say, what the issue is...

 

[Dark54555]

Can't even reformat the drives in Windows 10 (tried it with one, just to see what would happen). Sounds like this isn't an isolated issue:
http://www.tenforums.com/drivers-hardware/11261-cannot-read-usb-drive-parameter-incorrect.html

http://community.wd.com/t5/WD-Portable-Drives/Windows-10-and-WD-Elements/td-p/893805