password to unlock ssd drive not recognized
I have Time machine on a Samsung ssd. When I updated to iMac M4, I tried initializing the SSD and Time Machine seemed to accept the drive. Now a message asks me for the password to unlock the disk, but the one I have does not work. Do I need to discard the disk and start with a new one? The disk in question is connected to one of the four Thunderbolt connections on the iMac. Of course the Mac OS is Sequoia.
iMac 24″, macOS 15.1