Fix 'Can't Format USB Flash Drive' Error and Restore It to Full Size

Tracy King updated on Apr 17, 2019 to Partition Master | How-to Articles

Windows won't allow me to format USB, help!

"Hi there, do you know why does Windows computer won't allow me to format USB drive? I have a USB drive which is now inaccessible. I tried to format the USB drive to factory settings so that it would be available for data saving again. However, I failed. 

My computer, installed with Windows 10,  just won't allow me to do so. I don't know why. Do you know how to solve this problem?"

Windows can't format USB.

Here is a list of reasons why that your computer can't format USB and you can check whether your USB drive is staying with the same problems:

  • Virus Infection
  • Bad Sectors
  • Physical Damage
  • Device Write Protected (When the USB is write protected, you'll need an advanced way to format write protected USB.)
  • Incompatible File System

If you are having a similar problem for unable to format or can't complete the format process on your hard drive partition, external hard drive, USB, SD or other devices, don't worry. Here in the below, we'll show you two effective methods to fix USB format failure error by using free format utility or CMD.

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 Windows 10 is supported

Notice:
If you have important data saved in your USB, SD card, external hard drive or Windows hard drive partition, find a powerful backup software to back up your data first. (EaseUS Todo Backup will work for you.)

Method 1. Format and restore USB to full capacity with free format utility

If you prefer simpler and easier tool to fix unable to format USB error, EaseUS free format utility - Partition Master can be your best shot. This tool allows you to effortlessly format and restores USB drive to its full capacity within 3 steps.

You can free download and install it on your Windows 10/8/7 etc PCs and follow to restore your USB drive to its full size now:

Step 1: Select the USB drive to format.

Connect the USB drive or pen drive to your computer. Download and launch EaseUS partition software. Right-click the USB drive you intend to format and choose "Format".

Format Hard Drive Partition - Step 1

Step 2: Set the drive letter and file system.

Assign a new partition label, file system (NTFS/FAT32/EXT2/EXT3), and cluster size to the selected partition, then click "OK".

Format Hard Drive Partition - Step 2

Step 3: Check the warning box.

Click "OK" if you see the Warning window. If you have important data on it, back up the data in advance.

Format Hard Drive Partition - Step 3

Step 4: Apply the changes.

Click the "Execute operation" button first, and then click "Apply" to format the USB drive.

Format Hard Drive Partition - Step 4

After this, you'll be able to use USB drive for storing data and back up fancy data and important personal documents now. 

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 Windows 10 is supported

Method 2. Fix 'can't format USB flash drive' error by CMD

  1. 1. Connect USB drive or other devices that you need to format to your PC.
  2. 2. Press Win + R to open the "Run" dialog, type: cmd and hit Enter to open Command Prompt.
  3. 3. Select "Run as Administrator", type: diskpart and hit Enter.

Open diskpart.

  1. 4. Type: list disk and hit Enter to display all disks on your computer.
  2. 5. Type: select disk 2 and hit Enter. (2 is the drive letter of your USB.)
  3. 6. Type: clean and hit Enter.

Clean USB.

  1. 7. Type: create partition primary and hit Enter.
  2. 8. Type: format fs=fat32 or format fs=ntfs quick and hit Enter to reset USB drive to FAT32 or NTFS.

Reformat USB to detectable file system.

10. Type: assign and give your USB drive a new drive letter. Then type: exit to finish the process.

After this, you'll be able to use your USB drive to save and store new data again.

 
 

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Frequently Asked Questions

Why Choose EaseUS Partition Master?

"I've used Partition Master Professional many times to create, delete, format, move, rename, and resize partitions."PCWorld

"Partitioning tools have come a very long since the days of complicated command line utilities and EASEUS Partition Master is one of the most advanced programs available."TECH ADVISOR

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Will the "Migrate OS" feature transfer the Windows system files only or the whole C drive?

To ensure that the migrated system will boot normally, the Migrate OS feature will transfer all the files in the system and the boot partitions. Generally, the boot partition is the C drive so the transfer will include all the files in C.

Does EaseUS Partition Master license apply to multiple computers?

The license of Partition Master Professional and Server editions can be used on 1 computer only, while that for for the Technician and Unlimited editions can be used on multiple machines.

What is the difference between EaseUS Partition Master Trial version and the Free version?

Free is for home users only, with most basic functions available such as partition resize and clone. While trial can help you understand how this product works and test what a full license can do on a business or server OS machine.

Will it cause any data loss after resizing the partition in EaseUS Partition Master?

Generally, it will not cause any data loss or boot issue by resizing a partition. However, in order to protect your data, we suggest that you backup the partition before resizing, in case of any unexpected situations such as power outages, computer hardware failures, etc. You can use EaseUS Todo Backup to backup the partition and its trial version is fully functioned for 30 days.

What should I prepare before resizing the partition?

On the partition that is going to be operated, there might be some files being occupied by other programs. To ensure a successful operation, we suggest that you close all the unnecessary software before resizing that partition. Otherwise, EaseUS Partition Master will detect the partition being locked by the other software and require a reboot to resize the partition under boot mode.

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