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How to Format a Bootable USB Drive

Updated on Dec 04, 2018 by Daisy to Partition Master

Have no idea about how to format or reformat a bootable USB drive on Windows 10/8.1/7? Don't worry; this tutorial will help you to do it and make it work as a normal storage drive again.

"Hi, I'm thinking about formatting a bootable USB drive in Windows 10, but it's so weird that the USB drive is now showing several MBs capacity. It should be a 4GB size in total. What should I do to format the bootable USB drive properly and restore its full capacity?"

Solution 1. Format bootable USB drive with EaseUS Partition Master

EaseUS Partition Master is a disk/partition management software tool that allows users to fully manage their hard drive storage. This free partition manager is selected as the most powerful yet free USB formatting tool that helps to format a bootable USB drive, memory card, pen drive, and other hard disk storage devices easily and quickly without losing the original size.

Download and install EaseUS Partition Master on your Windows computer and follow the steps below to perform the storage device formatting with ease.

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 Windows 10 is supported


Step 1: Launch EaseUS Partition Master, right-click the partition on your external hard drive/USB/SD card which you want to format and choose the "Format" option.

Format Hard Drive Partition - Step 1

Step 2: 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: In the Warning window, click "OK" to continue.

Format Hard Drive Partition - Step 3

Step 4: Click the "Execute Operation" button in the top-left corner to review the changes, then click "Apply" to start formatting your external hard drive/USB/SD card.

Format Hard Drive Partition - Step 4

Solution 2. Format bootable USB drive by using Diskpart command

It's also practical to use the diskpart command to format your USB drive. If you are quite familiar with the use or command prompt, this method is also a good choice for you.

Step 1: Press "Windows key + R" simultaneously, type cmd in the search box and open "Command Prompt".

Step 2: Type diskpart. Run the Pop-up window that appears.

Step 3: Type list disk.

Step 4: Type select disk 0 (or disk 1... the number is the drive of the bootable USB that is going to be formatted).

Step 5: type clean.

Step 6: Type create a primary partition

Step 7: Go to "My Computer" or "This PC" (Windows 10), right-click on the bootable USB drive and select the "Format" option to format it.

The two methods given above will help to format a bootable USB drive successfully and restore it to original condition.