To check SSD size in Windows 10, open File Explorer > This PC to see each drive’s capacity and free space. For the physical drive size and type, open Task Manager > Performance and select the disk: it shows SSD or HDD and the Capacity. Disk Management shows every partition on the drive. Windows reports sizes in binary units, so a “500 GB” SSD appears as about 465 GB. Windows 10 reached end of support on October 14, 2025. Consumer Extended Security Updates (ESU) now run until October 12, 2027.
Quick Answer
This PC for capacity and free space. Task Manager > Performance > Disk for type (SSD) and total capacity.
Steps to Check SSD Size
- Press Windows + E and click This PC. Each drive shows total and free space.
- Press Ctrl + Shift + Esc, open Performance and click each Disk to see its type and capacity.
- For partitions, right-click Start and choose Disk Management.
- To confirm media type, search for Defragment and Optimize Drives; the Media type column shows Solid state drive.
Why the Size Looks Smaller
| Advertised | Shown in Windows (approx.) |
|---|---|
| 256 GB | 238 GB |
| 500 GB | 465 GB |
| 512 GB | 476 GB |
| 1 TB | 931 GB |
Recovery partitions also take a little space.
Troubleshooting
- New SSD not in This PC: It needs initialising and a volume in Disk Management.
- Not sure SSD or HDD: See checking SSD or HDD.
- Speed test: See checking SSD speed.
- On Windows 11: See checking SSD size in Windows 11.
Frequently Asked Questions
Is space missing from my SSD?
Usually not; it’s the unit difference plus recovery partitions.
Can I see the model number?
Yes. Device Manager > Disk drives, or Task Manager shows it above the graph.
How much free space should I keep?
Keeping 10 to 20% free helps performance and updates.
Summary
- Check This PC for capacity.
- Use Task Manager for type and size.
- Use Disk Management for partitions.
- Expect a lower number than advertised.
Kermit Matthews is a freelance writer based in Philadelphia, Pennsylvania with more than a decade of experience writing technology guides. He has a Bachelor’s and Master’s degree in Computer Science and has spent much of his professional career in IT management.
He specializes in writing content about iPhones, Android devices, Microsoft Office, and many other popular applications and devices.