How to Solve Format 4.0 Buffalo External Hard Drive Trouble, Help Me!

I'm attempting to format a 4.0TB Buffalo drive. But just a portion of it will let me format it; the other unallocated portion appears to be locked or trapped in some way. The choices are all grayed out. Any suggestions?

Best Answered by

Cici· Answered on Feb 28, 2023

If you can't use the rest part of your Buffalo external hard drive, it may be caused by the partition scheme: GUID Partition Table (GPT) and Master Boot Record (MBR).

  • MBR only supports a 2TB hard drive, limited to four primary or three primary and extended partitions.
  • GPT has no size limit. It can support up to 128 primary and unlimited logical partitions.

Extended Reading: MBR VS GPT | What's the Difference and Which Is Better

In the MBR, Windows can only handle the first 2TB of the drive. The rest of the capacity will not be available. So you can't do a full format of Buffalo external hard drive. In contrast, GPT can see any hard drive that exceeds the capacity. You need to convert MBR to GPT first and then format it.

Diskpart or Disk Management requires deleting the existing partition first, which can cause data loss. So why not try a simple and safe conversion tool? EaseUS Partition Master is the most considerate choice for computer novices.

Free Download 

Windows 11/10/8/7100% Secure

It simplifies all the procedures of converting MBR to GPT. You can easily solve format 4.0 Buffalo External Hard Drive problems in three simple steps.

Step 1. Launch EaseUS Partition Master and go to "Disk Converter."

Step 2. Select "Convert MBR to GPT" and click "Next."

Step 3. Select the target MBR disk and click "Convert."

After the conversion is complete, you can continue to use the tool to format your hard drive. EaseUS Partition Master provides a full service for your hard drive management.

People Also Ask

Can't Extend Volume on Windows Server 2016, What Should I Do?

If the extend volume option is greyed out, you cannot extend volume on Windows Server 2016. This article provides a detailed guide on this issue and helps you solve this problem.


Mar 01, 2023

How Do I Fix Invalid Operation for Device 0 in VMware

On this page, you will learn why device 0 is not working in VMware. This page will easily help you find the cause and provide a solution to invalid operation for device 0 in VMware.


Feb 28, 2023

Format a 14TB Hard Disk to MBR or GPT, How to Choose?

This article will quickly help you figure out how to format a new 14TB hard drive. And it will help you to choose MBR or GPT format wisely. You will get one of the best tools to complete the formatting of a 14TB hard drive.


Feb 22, 2023

How Can I Increase Windows Server 2012 Disk Beyond 2TB, Help

This short page will teach you how to increase disk beyond 2TB on your Windows Server 2012. This passage will recommend a quick and easy way to help you.


Mar 09, 2023

Best Ways to Free Up Data Server Storage, Any Suggestions?

This page will provide a variety of effective ways to free up disk space. With the methods provided in this article, you can increase storage space and maximize the efficiency of disk usage.


Feb 28, 2023

Help, How Can I Convert MBR to GPT Without Data Loss on Windows Server

As it is known to all, converting MBR to GPT will delete all data on the origin disk. This article focuses on this issue and helps convert MBR to GPT without data loss on Windows Server.


Feb 28, 2023