[Solved] Windows Was Unable to Complete the Format SD & USB

Jean updated on Dec 03, 2018 to Partition Manager | How-to Articles

"Windows was unable to complete the format" Error

How to format a removable disk (external hard drive, HDD, SSD, USB flash drive, SD card, pen drive & CD/DVD) if Windows was unable to complete the format? For example, if "Windows was unable to complete the format" on SD card, you should know that something goes wrong with the card. It's probably because:

Windows was unable to complete the format

  • The disk is write protected and Windows won't allow you to format the SD card;
  • The memory SD card is infected by the unknown virus;
  • The memory SD card is damaged or corrupted;
  • The memory SD card had some bad sectors.

Fix "Windows was unable to complete the format" Error in Windows 7/8/8.1/10 with Best Solutions

If Windows was unable to complete the format SD card, USB drive or CD/DVD, take the first step to remove viruses from the storage drive. If the format error remains, you should now turn to some advanced format tools.

Solution 1. Error "Windows was unable to complete the format," fix it by:

third-party format utility - EaseUS Partition Master

Download EaseUS partition magic software, then follow the steps to format your computer hard drive.

Download Now

 Windows 10 is supported


Step 1: Run EaseUS Partition Master, right-click the hard drive partition you intend to format and choose "Format".

Format Hard Drive Partition - Step 1

Step 2: In the new window, set the Partition label, File system (NTFS/FAT32/EXT2/EXT3), and Cluster size for the partition to be formatted, then click "OK".

Format Hard Drive Partition - Step 2

Step 3: Then you will see a warning window, click "OK" in it 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 the partition on your hard drive.

Format Hard Drive Partition - Step 4

Smaller cluster size makes less wasting of disk space. The smaller cluster size is, the bigger file allocation table (FAT) will be. The bigger the FAT is, the slower the operating system works with the disk.

Solution 2. Error "Windows was unable to complete the format," fix it by:

Windows Disk Management program

Step 1: Right-click the computer icon in Windows 7 or This PC in Windows 8-10 and select "Manage." On the pops up window, from the right pane go to "Storage" -> "Disk Management."

Step 2: Now find the SD card or USB drive that shows unable to complete the format error. If there are any partitions on the drive, delete them all, and then you'll get a single volume.

Step 3: Right-click on the drive and hit "Format." Choose the NTFS file system if the device is larger than 4GB, or else choose the FAT32 file system.

format drive in Windows Disk Management to fix Windows was unable to complete the format


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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

"I love that the changes you make with EaseUS Partition Master Free aren't immediately applied to the disks. It makes it way easier to play out what will happen after you've made all the changes."Lifewire

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.

About EaseUS Partition Master

All-round disk & partition management software for personal and commercial use. Let it manage your storage drive: resize, format, delete, clone, convert, etc.