What is the best disk partition software for Windows 11/10 now?

DiskPart is Microsoft's command-line disk partition software utility. When you launch it, it opens its own mini-shell where every command targets the currently selected disk, partition, volume, or virtual hard disk (VHD). From there you can list hardware, inspect attributes, and perform low-level storage tasks that the graphical Disk Management console either hides or can't do at all.

At its core, DiskPart disk partition manager lets you create, delete, format, extend, shrink, and clean partitions or whole disks. You can flip a drive from MBR to GPT (or back), mark a partition active so BIOS firmware sees it as bootable, bring a disk online/offline, change drive letters, or wipe every sector with a single clean all command. Because it runs in WinPE and Server Core, it’s also the go-to tool for scripting unattended installs—batch files can automate complex layouts, such as:

select disk 0 
create partition efi size=100
format fs=fat32 quick

Beyond physical media, DiskPart can mount, create, and expand .VHD/.VHDX files, toggle read-only flags, and manage Storage Spaces’ simple mirrors or parity sets. What it deliberately does not handle are Linux file systems, BitLocker resizing, or advanced copy-on-write formats like ReFS—those need other tools.

In short, DiskPart is a powerful free disk partition manager software to Windows 11 and Windows 10. It is always present, scriptable, and perfectly free, but unforgiving if you target the wrong disk.