Windows 10 upgrade and Truecrypt
Do NOT upgrade on a System-encrypted-TrueCrypt drive!
you have to decrypt -> upgrade -> encrypt
Can you safely upgrade from Windows 7 to Windows 10 when using TrueCrypt 7.1a
TrueCrypt is no longer supported.
You should decrypt your hard disk and any other data before upgrading as otherwise you cannot be sure you will be able to retrieve your data.
If you wish to still use unsupported software
Some people have stated that TrueCrypt still works with Windows 10.
- Decrypt the disk, do the upgrade, then make sure TrueCrypt still functions after the upgrade.
- Make backups should be made before and after you encrypt the HDD and perform that first reboot.
The development of TrueCrypt was ended in 5/2014 after Microsoft terminated support of Windows XP. Windows 8/7/Vista and later offer integrated support for encrypted disks and virtual disk images. Such integrated support is also available on other platforms (click here for more information). You should migrate any data encrypted by TrueCrypt to encrypted disks or virtual disk images supported on your platform.
Source http://truecrypt.sourceforge.net
It is likely to be incompatible. It is always recommended you decrypt your hard disk and any other data before upgrading an operating system or else it will not be accessible after upgrading.
Source Windows 7 to 10 upgrade: TrueCrypt 7.1a
I have practically tested 7.1a on Windows 10 on a VMWare environment.
YES, it does work. You can use TrueCrypt 7.1a system drive encryption with Windows 10, but in order to do that, you must:
Un-encrypt the drive
Update to Windows 10
Make sure you do not use UEFI Secureboot.
After Windows 10 is updated, re-encrypt the system drive.
So I confirm it is compatible with Windows 10 boot system, but make sure you follow the rules above when updating.