If your 16GB pendrive is showing only 8GB of capacity and formatting it doesn't solve the problem, follow these steps to restore the lost capacity:
Steps to Restore Full Capacity
1. To fix this open the command prompt Open Command Prompt:
- Press 
Windows + Rto open the Run dialog box. - Type 
cmdand press Enter to open Command Prompt. 
2. Use DiskPart Utility:
- In the Command Prompt window, type 
diskpartand press Enter. 
Microsoft Windows[Version 6.3.9600]
(c) 2013 Microsoft Corporation. All right reserved.
C:\Users\Mrdev> diskpart
- Upon execution, this will open the DiskPart utility in a new window.
 
3. List All Disks:
- Type list disk and press Enter. This command will display all the disks connected to your computer.
 
Microsoft DiskPart version 6.3.9600
Copyright (c) 1999-2013 Microsoft Corporation.
On Computer: Killer
DISKPART> list disk
- You will see a list similar to this:
 
DISKPART> list disk
Disk ###        Status     Size         Free     Dyn      Gpt
----------    ---------    -------    -------    -----   ------
Disk 0          online     931 GB      1024 KB             -
Disk 1          online     14 GB          0 KB             
DISKPART> 
4. Select Your Pendrive:
- Identify your pendrive from the list (e.g., Disk 1).
 - Type 
select disk 1(replace 1 with your disk number) and press Enter. 
DISKPART> select disk 1
Disk 1 is now the selected disk.      # You should see a confirmation message:
DISKPART> 
5. Clean the Disk:
- Type 
cleanand press Enter. This command will remove all partitions and data on the selected disk. 
DISKPART> clean
Diskpart succeeded in cleaning the disk.
DISKPART> 
6. Create a New Partition:
- Type 
create partition primaryand press Enter. This will create a new primary partition on the pendrive. 
DISKPART> create partition primary
Diskpart succeeded in creating the specified partition.
DISKPART>  
- After creating the partition, you need to format the pendrive. Type 
format fs=ntfs quick(orformat fs=fat32 quickfor FAT32 file system) and press Enter. 
DISKPART> format fs=ntfs quick
8. Exit DiskPart:
- Type 
exitto leave the DiskPart utility. 
DISKPART> exit
Your pendrive should now show its full capacity of 16GB. If you still encounter issues, try repeating the steps or checking if the pendrive has any physical damage.

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