How to Partition a Hard Drive on Windows 11
Short answer: Right-click Start, open Disk Management. To make a new partition, right-click C:, Shrink Volume, enter the size, then right-click the resulting black unallocated space, New Simple Volume, and assign a letter. Never delete the small EFI System Partition or the recovery partition — the machine will not boot without EFI. To resize beyond what Shrink allows, a third-party tool can move the locked files in the way.
Right-click Start, Disk Management. Your drive shows up as a row of colored bars — blue for used partitions, black for unallocated space. The small 100MB one labeled EFI System Partition is the boot loader. Don’t delete it, your machine won’t start without it. The big chunk is C:, and there might be a recovery partition tucked at the end.
No black bar anywhere means C: is using the whole disk. Right-click C:, Shrink Volume. Windows thinks for a while, then tells you how much space you can shrink by. The number is almost always disappointingly small because there are unmovable files sitting past the halfway mark of the partition. Page file, hibernation file, system restore snapshots — Windows puts them wherever it wants and then refuses to move them.
Enter the size you want in megabytes. 100GB = 102400MB. Hit Shrink. Takes a few seconds. Now right-click the new black Unallocated section, New Simple Volume, Next, pick a size, assign a letter, NTFS, give it a name, Finish. Shows up in File Explorer immediately.
Getting More Shrink Space
Windows offered 50GB but you wanted 200. Here’s what’s blocking it.
Page file. Settings, System, About, scroll down to “Advanced system settings,” Performance section click Settings, Advanced tab, Virtual Memory, Change. Uncheck the automatic management box, click “No paging file” for C:, Set, restart the machine. Go back to Disk Management and try the shrink again — the number should be way bigger now. Set the page file back to System Managed when you’re done.
Hibernation file is the other big one. It parks a copy of your RAM contents on the disk and on a machine with 16GB that’s a 16GB file sitting at a fixed location that Shrink can’t move past. Admin command prompt: powercfg /hibernate off. Deletes the file. Shrink the volume. powercfg /hibernate on afterwards if you use hibernate or Fast Startup.
System Restore shadow copies sometimes block it too. Temporarily disabling protection in System Properties, shrinking, then re-enabling gets past that. But don’t leave it off — restore points are genuinely useful.
Merging Partitions Back
Changed your mind, want the extra partition folded back into C:. Right-click the partition you’re removing, Delete Volume. Data’s gone — move anything you want off it first. Then right-click C:, Extend Volume.
Here’s the annoying part: Extend Volume only works if the unallocated space is immediately to the right of C: in the Disk Management view. If there’s a recovery partition sitting between C: and the free space, Disk Management can’t extend across it. You’d need MiniTool Partition Wizard or GParted off a USB to move the recovery partition out of the way first.
And don’t partition a 256GB SSD at all. Windows eats 30-40GB, EFI and recovery take a few more, and once you factor in the space SSDs need for wear leveling you’re working with maybe 200GB usable. Cut that in half and you’ve got two partitions that are both going to fill up within a year. Partitioning makes sense starting at 500GB. Below that you’re just creating two problems where you used to have one.
Frequently Asked Questions
How do I create a new partition in Windows 11?
Right-click Start, Disk Management. Right-click your C: drive, Shrink Volume, enter the size in MB (100 GB = 102400 MB). After shrinking, right-click the new Unallocated space, New Simple Volume, format as NTFS, assign a drive letter. No third-party software needed.
Why can't I shrink my C: drive more than a small amount?
Unmovable files — the page file, hibernation file, and System Restore shadow copies — block the shrink operation. Temporarily disable the page file (Virtual Memory settings), run powercfg /hibernate off, and optionally disable System Restore. Shrink the volume, then re-enable everything.
Should I partition my SSD?
Only if you have 500GB or more. A 256GB SSD has roughly 200GB usable after Windows and system files. Splitting that into two partitions gives you two cramped drives that both run out of space. For most users, one partition with cloud backup is simpler and more practical than a multi-partition setup.
Can I merge two partitions without losing data?
Not directly in Disk Management. You can delete the second partition (losing its data) and then Extend Volume on the first. To merge without data loss, use a third-party tool like MiniTool Partition Wizard. The unallocated space must be directly adjacent to the partition you're extending — recovery partitions between them block the operation.