How to Restore Your USB Drive to Full Capacity on Windows

Sue Wayne

Jul 07, 2026 • Filed to: USB Recovery • Proven solutions

TL;DR:

You can restore a USB drive to its full capacity on Windows 7, 8, or 10 by resetting its partitions using native system tools, provided the hardware is not physically damaged.
    ● To rapidly rebuild the partition table, open Command Prompt, launch the "diskpart" utility, select your specific drive, and execute the "clean" followed by the "create partition primary" and "format fs=fat32 quick" commands.
    ● To treat bad sectors while restoring the original state, right-click the drive in Disk Management, select a FAT32 or exFAT file system, and intentionally uncheck the "Quick Format" option before proceeding.
    ● Because these capacity restoration methods will permanently erase all data on the drive, you must utilize a tool like Recoverit Data Recovery to scan and retrieve your lost files if you proceed without a prior backup.

---

Ask AI for a summary

ChatGPT Perplexity Gemini Claude Grok Free Download Free Download Free Download

When a USB drive does not show its full capacity on Windows, the missing space is usually caused by hidden partitions, unallocated space, incorrect formatting, bootable USB creation, file system errors, or drive damage. For example, a 64 GB USB drive may suddenly show only 2 GB, 8 GB, or a few MB after being used as an installer or recovery disk.

The issue can usually be fixed by deleting the wrong partition layout and creating one new full-size partition. However, restoring a USB drive to full capacity often requires formatting or cleaning the disk, which erases data. If the USB drive contains important files, recover or back them up before applying the fixes below.

Why Is My USB Drive Not Showing Full Capacity in Windows?

A USB drive may show less space than its real capacity when Windows can only access part of the drive, the partition table is damaged, or the drive itself is faulty. The most common causes include:

If the drive is physically damaged or fake-capacity, formatting may not restore reliable storage. In that case, recover important files first and replace the USB drive.

Before Restoring USB Drive Capacity: Back Up or Recover Files

Restoring a USB drive to full capacity usually means deleting partitions, cleaning the disk, or formatting the drive. These operations can erase files on the USB drive.

Before you continue:

1. Copy accessible files from the USB drive to another storage device.
2. If files are missing or inaccessible, scan the USB drive with recovery software before cleaning or formatting it.
3. Do not save recovered files back to the same USB drive.
4. Check the drive in Disk Management to confirm the correct disk number and capacity.
5. If the USB drive is making Windows freeze or disconnecting repeatedly, stop using it and recover data first.

How to Restore USB Drive to Full Capacity in Windows 10/8/7?

It's easy to restore your USB Drive to its full capacity and on Windows, the only condition is it shouldn't be physically damaged. You can easily achieve the objective by using one of the methods listed below, but these methods will erase all of your data from USB Drive, thus, it's recommended to take a backup.

Method 1. Restore USB Drive to Full Capacity Using CMD

DiskPart is the most complete built-in method when a USB drive shows the wrong capacity because of hidden partitions, bootable partitions, or a broken partition table. Be careful: the `clean` command erases the selected USB drive.

Follow these steps:

1. Connect the USB drive to your Windows PC.
2. Search for Command Prompt, right-click it, and choose Run as administrator.
3. Type the following command and press Enter:
   diskpart
4. List all connected disks:
   list disk
5. Identify your USB drive by size, then select it. Replace `#` with the correct disk number:
   select disk #
6. Confirm the selected disk is the USB drive:
   detail disk
7. Erase the partition layout:
   clean
8. Create one new primary partition:
   create partition primary
9. Format the USB drive. Use **exFAT** for most modern USB drives, especially larger drives:
   format fs=exfat quick
10. Assign a drive letter:
    assign
11. Exit DiskPart:
    exit

After these steps, Windows should show the USB drive at its full usable capacity.

Method 2. Restore USB Drive Capacity With Disk Management

Disk Management is easier than CMD and works well when the USB drive shows unallocated space or a damaged partition in Windows. This method also erases data, so back up or recover files first.

1. Right-click Start and choose Disk Management, or search for `diskmgmt.msc`.
2. Find the USB drive by checking its disk size carefully.
3. If the USB drive has multiple small volumes, right-click each USB volume and choose Delete Volume.
4. When the USB space becomes Unallocated, right-click it and choose New Simple Volume.
5. Follow the wizard and use the maximum available size.
6. Choose a file system such as exFAT, FAT32, or NTFS.
7. Assign a drive letter and finish the wizard.

After the new volume is created, File Explorer should show the USB drive with its restored usable capacity.

What If the USB Drive Still Does Not Show Full Capacity?

If DiskPart and Disk Management do not restore the correct capacity, check these possibilities:

How to Recover Lost Files From USB Before or After Restoring Full Capacity

If the USB drive contains important files, recover them before using DiskPart or Disk Management whenever possible. If you already cleaned or formatted the USB drive, stop using it immediately and scan it before saving any new files to it.

Wondershare Recoverit can help recover deleted, formatted, or inaccessible files from USB drives, pen drives, external drives, SD cards, HDDs, SSDs, cameras, and other storage devices.

Just Download the Recoverit program by clicking the buttons below, which can be used for either Windows and macOS.

Recoverit Data Recovery - The Best File Recovery Software

• You can recover all kinds of data like Audio, Video, Documents, ZIP, etc.
• You can recover lost files from USB Drive, Pen Drive, SSDs, HDDs, SD card, PC, Mobile, Camera, etc.
• You can configure the scanning process by using filters like File Type, File Path, Date, Size, etc.

Download | Win Download | Mac

Security Verified. 3,591,664 people have downloaded it.

User Guide to Recover Data:

Video Tutorial on How to Recover Deleted Files from USB Drive

Recent Videos from Recoverit

View More >

Step 1. USB Drive Selection

The first window you will see inside the tool is the "Hard Drives and Locations" window. Look for your connected USB Drive under the "SD Card Recovery" section. Select your USB Drive and click on the "Scan" button to initiate the scanning process.

Step 2. Scanning Process

You will be transported to a new window, and during the scanning process, you are allowed to configure scanning through various means. From the left panel, you can select a File Type or a File Path for more accurate scanning. From the top panel, you can filter the scanning results by using filter options like Date, Size, Name, etc. You can also Pause and Play the scanning process.

Step 3. USB Drive Recovery

You will have all the recoverable files listed on the window after the scanning is done. Navigate to the files you want to recover. You can also Preview the files to be sure of the quality of recovery. Select all the files that you want to recover and click on the "Recover" button. You will be asked to choose a location on your PC to save files, choose a location, and click "OK".

After the recovery process is completed, you will be able to access all of your selected and recovered files at the location you choose.

Conclusion:

If your USB drive is not showing full capacity on Windows, the cause is usually hidden partitions, unallocated space, incorrect formatting, or a damaged partition table. DiskPart is the strongest built-in fix, while Disk Management is easier for simple unallocated-space cases.

Before using either method, back up or recover important files because restoring full capacity usually erases the USB drive. If the USB still shows the wrong size after cleaning, repartitioning, and formatting, the drive may be physically damaged or fake-capacity and should be replaced.