1. What is Usable Disk Space?

Usable disk space is the amount of storage available for user data after accounting for system reserved space, file system overhead, and other system requirements on Windows 10.

2. How Does the Calculator Work?

The calculator uses the simple formula:

Where:

• \( Usable \) — Space available for user data (GB)
• \( Total \) — Total physical disk capacity (GB)
• \( Reserved \) — Space reserved by system (GB)

Explanation: The formula calculates the difference between total disk capacity and space reserved for system files, recovery partitions, and other OS requirements.

3. Importance of Calculating Usable Space

Details: Understanding usable space helps in proper disk management, planning storage needs, and avoiding unexpected space shortages on Windows 10 systems.

4. Using the Calculator

Tips: Enter total disk space and reserved space in GB. Both values must be positive numbers, and reserved space must be less than total space.

5. Frequently Asked Questions (FAQ)

Q1: Why is usable space less than total space?
A: Windows reserves space for system files, recovery partitions, file system overhead, and other requirements.

Q2: How can I find reserved space on my Windows 10?
A: Check Disk Management (diskmgmt.msc) or use "fsutil fsinfo ntfsinfo C:" command in Command Prompt.

Q3: Can I reduce reserved space?
A: Some reserved space can be reclaimed by disabling hibernation, reducing page file size, or deleting recovery partitions (not recommended for most users).

Q4: Does this calculator work for SSDs?
A: Yes, the calculation works the same way for both HDDs and SSDs.

Q5: Why does Windows show less space than calculated?
A: Windows reports space in binary GB (GiB) while manufacturers use decimal GB, and additional hidden system files may occupy space.