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Reasons for "USB Drive not Showing Full Size" and How to Restore It?


Summary:

Have you ever meet "USB Drive not showing full size" issue but you don't know why? This article will discuss such problem and provide solutions to repair it.

Overview of the issue

USB storage devices such as external HDD, USB flash drive, pen drive, memory card, etc. play an important role in our life. We can store large amount of data on SD card or flash drive so that we can take them everywhere coveniently. However, hard drive may show wrong capacity in some cases, especially the shortage of total storage of used space and free space. In this way, you need to restore its full capacity.

Why doesn’t USB drive show full capacity in Windows?

Generally speaking, the situations that a pen drive shows less space happens including:
        ●The USB drive is made to bootable disk. Installing bootable OS (operating system) such as Chrome or Linux. It will change the partition system of your pen drive so some free space will appear
        ●The USB drive is divided into two or more partition.
        ●There is unallocated space. We all know that unallocated disk space cannot be used if there is not partition created on it. The result is that you can only make use of allocated space. Therefore, we can fix the problem by adding unallocated space to existing partition.
        ●The disk is physically damaged. If the storage device is physically damaged, the capacity might change. The entire disk size in Disk Management shrinks or increases largely, or the USB drive shows 0 bytes if you check its properties.
        ●Removing the pen drive suddenly while it is working
        ●Interruption before formatting completed or using some third-party software inappropriately
        ●Computer virus

How to fix "USB drive not showing full size" issue?

This part provides two solutions to fix "USB drive not showing full size" (restore USB drive backup to original capacity).
Tips: All solutions will completely wipe the data on USB drive, please backup all important files before proceeding. Besides, carefully select the order before formatting or cleaning operations, or you may run into wrong disk by mistake.

Solution 1: Restore USB flash disk to full capacity with DiskPart

Step 1: Run "Command Prompt" as "Administrator". You can launch it easily by clicking the "Start" button and select option "Command Prompt (Admin)".
 
Step 2: Type the "diskpart" command in the "Command Promp" windows and hit "Enter".
usb drive not showing full size
 
Step 3: Type "list disk" command so that the diskpart lists all disks connected to your computer, and the command should be followed by pressing "Enter".
 
Step 4: Execute "select disk #" command to select the USB disk you want to restore capacity.
 
Tips: Be very careful here! "#" is the disk number of your USB drive, you should replace "#" with the correct disk number. Be sure that you select the correct drive, as all the rest actions will be performed on the selected disk. If you select the wrong one, you’ll lose all the data that stored on the disk.
 
Step 5: Type "clean" command and press "Enter".
 
Step 6: Type "create partition primary" command to create a new partition on the USB drive after DiskPart succeeded in cleaning the disk.
usb drive not showing full size
 
Step 7: Type "format fs=fat32 quick" command to formats the newly created partition to FAT32 file system.
 
Now you can open "Windows Explorer" to check if the USB drive is restored to full capacity.

Solution 2: Format via "Disk Management"

Disk Management is provided by Windows and it helps to manage partitions and disks for computer. Disk Management is able to create new volume, extend or shrink partition, change drive letter, delete or format partition, etc. The error flash drives can be repaired with Disk Management tool. Following the steps below, the USB formatting procedure can be performed successfully.
 
Step 1
Open Disk Management. Right click on "My Computer" and select item "Manage", and then click ":Disk Management" on the left side. In the center section, you can see local hard drive and partitions and the USB drive which can be recognized by capacity.
usb drive not showing full size
 
Step 2
Right click the flash drive, select "Format" option and select file system format to perform quick format.
usb drive not showing full size
 
Step 3
Right click on the USB drive and select "New Simple Volume" item. You'll get the New Simple Volume Wizard which guides you to recreate new partition for the flash drive. Following the onscreen instructions, setting options and click "Next" button. When the process is done, you'll find the USB drive has been formatted and properly recognized by system.
usb drive not showing full size
 

How to recover lost data from formatted USB drive?

If the backup is unavailable at all, just trust Bitwar Data Recovery software to bring back lost data. Now free download it here.

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Steps to recover lost data

Step 1. Select your USB drive which you lost your important data, then click "Next".

Step 2. Select the "Formatted Recovery" mode if you formatted the USB drive just a moment ago. If files are not override by new data, files can be fully recovered.
 
In addition, if files are not found by quick scan, try “Deep Scan”. Deep scan can find all the files with a detailed scanning algorithm, but it will not display the file names and take longer time.
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Step 3. Choose the exact type of files you want to recover, you can select all types if you are not sure of the type of file.
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Step 5. After scan, filter the file you want with the name, type, path, and time. Then you can preview them one by one. After deciding the one you need, click "Recover" button to get them back. Here, you'd better save all the recovered files on a different drive or hard disk in case of data recovery failure.
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Since hard drive showing wrong capacity has a noticeable impact on data and system storage, you'd better fix "USB drive not showing full size" issue in time and retrieve the missing data as soon as possible.
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