Your computer should always be connected to a power supply throughout the encryption process.Depending on the amount of data in your system, encryption could take a pretty long time, so brace yourself.The partitions should also follow the NTFS file system. If you don’t have these partitions, don’t worry, BitLocker will create them for you. There needs to be a system partition with the operating system, and another partition with all the required files to start Windows. Your hard drive needs at least 2 partitions to run BitLocker.You may be able to use BitLocker without TPM but it will require extra steps.For the best results, you need to have a TPM chip on your computer.