Hi there

As the title suggests, I am experiencing an issue where full encryption on a data disk is taking much longer on Windows 10 than Windows 8.

Originally on a Windows 8 instance, I set up full drive encryption for both the OS (boot) disk which is an SSD which was fairly quick and painless. I also set up full encryption on a 3TB data disk which understandably took longer as it was a regular 7200 RPM SATA disk, however it did complete in a perfectly reasonable amount of time equating to roughly 10 to 12 hours.

Before performing a clean reinstalling of the system with Windows 10, I turned off BitLocker for both disks which took about the same amount of time to decrypt as it took to encrypt each which is great.

I then formatted and reinstalled the SSD with Windows 10 after which I enabled full drive encryption for it again which as before, completed in a very reasonable amount of time which is all good.

The issue I am experiencing is that when I initiated a full drive encryption on the 3TB data disk, it has been taking significantly longer to encrypt. Its not stuck thankfully, though the encryption process is much slower than before. It only encrypted about 20% in the time it took to previously encrypt as well decrypt (10 to 12 hours each respectively) while running on the previous Windows 8 instance.

At this given rate, it may take several days to finish and I am worried power interruptions (a norm in my country) may disrupt this process. Thankfully I have made backups of both drives beforehand if things really turn out for the worst.

Any ideas why this is taking so long and what can be done to speed it up? Many thanks.

Regards,

CTV

• Edited by CTV 1 hour 18 minutes ago