Review data preservation before changing a disk between dynamic and basic

Source facts

Microsoft says dynamic disks are deprecated and are not recommended for a new deployment; its guidance points to basic disks or Storage Spaces instead. The conversion article warns that its clean command permanently destroys data on the selected disk. The detail disk command describes the currently selected disk rather than accepting a disk number as its argument. Microsoft Learn.

Applicability

Identify why conversion is being proposed and whether a supported alternative meets the requirement. Record the physical disk identity and all data that must survive. Keep changing a disk type separate from initializing a new disk or extending a volume.

DSE recommendation

Require a preservation plan before any destructive step in the documented procedure. Have the data owner confirm which copies must be moved or backed up and how restoration will be demonstrated. Use an unambiguous disk inventory and a second-person target check. Perform the conversion only in the agreed maintenance scope after the intended recovery copy has been verified.

Verification

In a test environment, confirm the selected disk details before the operation and inspect the resulting disk type afterward. Restore or reconnect the intended data through the approved plan and validate it with the owner. Record any difference in layout or missing content. Do not accept an apparently successful conversion as proof that required data was preserved.

Official references

Microsoft Learn: Convert a disk to Dynamic or Basic. Source reviewed September 8, 2026.