Hi. Thank you for your question and reaching out. I’d be more than happy to help you with your query
Nope, formatting the C drive won't delete any data from the D drive. BitLocker encryption only affects the drive it's installed on, so formatting the C drive won't have any impact on the D drive's data. However, it's important to keep in mind that formatting the C drive will erase the BitLocker encryption key, making it impossible to access the data on the C drive without the BitLocker recovery key.
If the reply was helpful, please don’t forget to upvote or accept as answer, thank you.