Pattern to record: Volumes appear at wrong sizes or only on one operating system.

Identify the storage layer

BitLocker is an encryption layer, not a file system. The NTFS-specific checks here apply only after the authorised volume is unlocked and its underlying format is confirmed; retain the recovery key before firmware or hardware changes. One possible explanation is that primary and backup disk layout records disagree.

Protect data before repair

Never clear TPM or format the volume while recovery information is uncertain. Writing guessed boundaries can overwrite the start of a volume.

Evidence to check on the protected copy

1. Confirm ownership and recovery credentials before testing metadata or hardware changes.
2. Compare both partition-table copies on an image of the whole device.

Recovery and verification

If the checks support this cause, repair the authoritative table or recover partitions without formatting. Verification should cover authorised unlock, restart, file access, backup and recovery-key documentation.

For an assessment of your encrypted Windows computer, contact AEPC in Burswood or call 027 908 8880. Provide the model and the conditions that reproduce this problem. Workshop visits are by appointment.