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STATUS_VOLMGR_EXTENT_NOT_SECTOR_ALIGNED
STATUS_VOLMGR_EXTENT_NOT_SECTOR_ALIGNED means that either the proposed starting offset, the length, or both do not fall on the sector boundary required by the target disk. It is a byte-range validity error, not an instruction to tune filesystem clusters.
Range calculations should use the sector geometry presented by the target storage stack. Copying decimal-size values or source-disk offsets without checking their sector multiples is a common way to create an invalid request.
What to calculate
- Divide the proposed start offset and length by the target logical-sector size and require an integral result.
- Verify the disk identity and geometry after attaching a virtual disk, changing a controller path, or restoring to different hardware.
- Do not round an existing partition boundary in place; use a supported migration or recreation plan after backup.
Microsoft: DRIVE_LAYOUT_INFORMATION_EX
Microsoft: IOCTL_DISK_SET_DRIVE_LAYOUT_EX
Microsoft: Volume Manager error codes
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