I lost my bitcoin wallet, I have the key but lost the wallet, it was saved on an external hard drive but was stolen from me,
how I can get my wallet back?
the second question, If someone have bitcoin and have the bitcoin address, but lost the wallet, can the bitcoin be retrieved? and transfer to another wallet?
I hope you did not keep your keys in that hard drive, if the thief knows that it is where you stored your wallet and the keys then time is of the essence that you download or create a new wallet since you have the keys you can sweep it and transfer to a new address.
I had a similar experience when my hard drive was lost and being a newbie then I kept my private keys to the lost hard drive.