The essentials
Quick reference
One focused task per row. Jump to the related section for complete, working examples.
| Use | Syntax | Examples |
|---|---|---|
| List volumes | list volume | View examples |
| Select a volume | select volume 7 | View examples |
| Inspect the selected volume | detail volume | View examples |
| List supported filesystems | filesystems | View examples |
| Full-format NTFS | format fs=ntfs label="Data" | View examples |
| Quick-format NTFS | format fs=ntfs label="Data" quick | View examples |
| Quick-format exFAT | format fs=exfat label="Exchange" quick | View examples |
| Quick-format FAT32 | format fs=fat32 label="EFI" quick | View examples |
| Quick-format ReFS | format fs=refs label="Data" quick | View examples |
| Use 64 KB NTFS clusters | format fs=ntfs unit=64k label="Database" quick | View examples |
| Use recommended settings | format recommended label="Data" quick | View examples |
| Enable default NTFS compression | format fs=ntfs label="Archive" compress quick | View examples |
| Force dismount for format | format fs=ntfs label="Data" quick override | View examples |
| Assign a letter | assign letter=R | View examples |
| Verify the result | detail volume | View examples |
| Scan the new NTFS volume | chkdsk R: /scan | View examples |
DiskPart format creates a new filesystem on the selected volume and destroys access to its previous filesystem data. Select and verify the volume by disk, partition, size, label, and mount points before formatting. Use filesystems to discover what the current host supports, prefer default allocation units unless a workload has tested requirements, and remember that formatting is not media sanitization.
Step by step
Detailed examples
Resolve the volume back to its physical disk
A drive letter or old label is not enough identity. List volumes, select the candidate, inspect detail volume, and correlate its disk and partition with detail disk and list partition. Formatting the wrong volume is immediately destructive. Stop services and unmount application workloads before proceeding.
list volume
select volume 7
detail volume
attributes volume
rem Stop unless disk, partition, size, label, paths, and owner all match approval.Ask the host what the selected volume supports
The filesystems command reports the current filesystem and format choices for the focused volume. Availability varies with Windows edition, volume role, size, sector format, and media. Do not assume a filesystem is supported merely because DiskPart recognizes its name.
select volume 7
detail volume
filesystems
help formatMatch the filesystem to the workload
NTFS is the general Windows choice and supports permissions, compression, encryption, and many Windows roles. FAT32 is required for EFI system partitions and some devices but has a 4 GB individual-file limit. exFAT targets interoperable removable storage without NTFS security semantics. ReFS availability and supported roles vary; verify the specific Windows edition and workload documentation.
select volume 7
detail volume
filesystems
rem DANGER: formatting destroys the selected volume's prior filesystem.
format fs=ntfs label="Data" quickChoose quick or full format for the right reason
Quick format recreates filesystem structures but skips a full surface scan. A non-quick format takes longer and checks the volume, but neither mode is a guaranteed secure erase process. Use storage health diagnostics for suspected hardware failure and approved sanitization methods for disposal. Override forces dismount and can abruptly invalidate open file handles.
select volume 7
detail volume
rem This may take a long time and destroys existing filesystem data.
format fs=ntfs label="Archive"Keep defaults unless measurements justify tuning
Allocation unit size affects space efficiency, compression support, and application behavior. Default settings are appropriate for general use. A 64 KB unit is common for some database workloads only when vendor guidance, backup tooling, and performance tests agree. NTFS compression is unavailable above certain allocation sizes and should not be combined blindly with database or already-compressed data.
select volume 7
detail volume
filesystems
rem Validate application and backup support before using 64 KB clusters.
format fs=ntfs unit=64k label="Database" quickVerify filesystem, mount, and application behavior
After format, inspect detail volume and list volume, assign only an approved free letter or mount point, and run the filesystem's validation tools. Then test permissions, expected capacity, backup discovery, and application access. A successful format does not prove the selected allocation or filesystem is suitable for the workload.
detail volume
assign letter=R
list volume
exit
chkdsk R: /scanSources and further reading
References
Authoritative documentation used to verify and expand this cheat sheet.
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