During a fresh setup of Windows, the NVMe SSD appears as zero bytes.
During a fresh setup of Windows, the NVMe SSD appears as zero bytes.
Bitlocker won't be the main cause because it would appear in disk management if the OS partition was protected by Bitlocker, and the problem is more likely related to the RAID setup. You might have a JBOD configuration, and the Windows 11 installation could be mixing things up—showing the optical drive capacity instead of the SSD, which should resolve the issue by switching to AHCI.