By Bryce / Last Updated September 2, 2019

Can’t format flash drive in Windows Disk Management

USB flash drive is a kind of popular portable storage device. You may need to format it as you want to change its file system to store large file, make it compatible with the OS with which it will work or format it with certain file system before using. Usually, you can format USB flash drive with wanted file system within Disk Management.

However, when you try to format 64GB or 128GB USB flash drive partition to FAT32 via Disk Management, you’ll find that there is no FAT32 option available. When you try to format the second partition on the USB flash drive, you’ll be prompted by the message – “An unexpected error has occurred. Check System Event Log for more information…” Or you may encounter an error saying that “The format did not completely successfully” when you try to format RAW partition.

If you are encountered similar situation aforementioned before, it is time to ask the help of a third party trusted and powerful flash drive formatter.

Free and Reliable flash drive format tool: AOMEI Partition Assistant Standard

Among a great number of format tools for USB flash drive, AOMEI Partition Assistant Standard is highly recommended. It allows you to format 64GB, 128GB even larger drive to FAT32; enables you to format second partition on USB flash drive and SD card; can format RAW drive to normal file system. It is able to format flash drive to NTFS, FAT32, exFAT, Ext2, Ext3 or Ext4 just within few clicks.

With simple and intuitive graphic user interface, it is easy to use even for green hand incomputer. With small capacity of installation package, it can be installed very quickly. Especially designed for Windows operating system, it can work with 10/8.1/8/7, XP and Vista.

Format flash drive in Windows within three steps

To format USB flash drive with AOMEI Partition Assistant Standard, you should connect the USB flash drive to a working computer running Windows and free download AOMEI Partition Assistant Standard.

Then do as the following step-by-step tutorial. [Take formatting 128GB drive to FAT32 as an example]

Step 1. Install and run AOMEI Partition Assistant Standard. Locate your USB flash drive, right click the partition or one partition on it and choose “Format Partition”.

Format Partitoin

Step 2. In the small pop-up window, set the file system of your flash drive partition and click“OK”.

Fat32 128gb Usb

PS.: In this window, it is allowed to change cluster size or specify partition label.

Step 3. Return to the main interface. Confirm your operation and click“Apply”>“Proceed” to perform it.



  • If your flash drive present as “Unallocated”, right click the unallocated space and choose “Create Partition” to format it with certain file system.

  • AOMEI Partition Assistant Standard is not only suitable for flash drive, but also for SD card, external hard drive and internal hard drive.

Wrap things up

It is not a tough task to format flash drive in Windows 7/8/10. In many cases, you can use Disk Management to format partition on flash drive successfully. Or you can turn to this comprehensive flash drive formatter – AOMEI Partition Assistant Standard to complete formatting operation.

Actually, AOMEI Partition Assistant Standard is more than a format tool. It is featured with many other functions. For instance, it is capable of making conversion between NTFS and FAT32; it can help you to securely erase flash drive without reinstalling. Well, you can upgrade it to Professional version if you want to experience more functions like recover deleted partition on flash drive.