EaseUS Partition Master

A simple partition tool to manage disk space in Windows 11/10.

  • MBR to GPT Converter, make Disk Ready for Windows 11.
  • Migrate Windows 11 to New SSD in 1-Click.
  • C Drive Cleaner & Windows 11 Performance Optimizer.
  • Rescue Data When Windows 11 Corrupts or Dies.
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2 Fixes for SD Card Unallocated Error | Partition Unallocated SD Card

Updated by Cedric on Apr 16, 2021
Written by Brithny

SD Card Unallocated Error

SD card usually is allocated with only one partition which readable by the computer and other devices such as photos or cameras. However, due to different needs, quite a lot SD card users choose to create more partitions on SD card. Indeed, creating more partitions on SD card does bring users great convenience in dealing with their daily jobs and life. 

However, due to careless or improper operations, virus attack, or other unknown reasons, some inevitable problems may still happen to SD card users. The typical problem is that partitions disappear in SD card, which means that SD card becomes unallocated. Then you'll lose all data and partitions in SD card. How to fix such a problem? EaseUS software provides the most complete and securest solution with its professional partition manager software for you here now.

How to Avoid Data Loss Before SD Card Becomes Unallocated

It is highly recommended for you to backup all important data from your SD card to a safe storage device. With SD card data backup, you don't need to worry about losing important files or documents anymore when unexpected troubles happen to your SD card, or SD card becomes unallocated. 

With backups, you can directly fix SD card unallocated problems then. Let's find solutions to partition unallocated SD card right now.

Fix SD Unallocated Error: Partition Unallocated SD Card

Here EaseUS software will provide you with two methods to fix SD card unallocated problem. One is to use EaseUS Partition Master restore or recreate partitions in on SD card. The other one is to use Windows Disk Management too to rebuild partitions on unallocated SD card directly. 

Solution 1. Use EaseUS Partition Master 

EaseUS Partition Master offers two methods to help fix the SD card unallocated trouble: restore partition and recreate partitions on SD card. Now you can either choose to restore the previously lost partitions or to recreate new partitions on your SD card. Free click the download button and install EaseUS Partition Master on your computer. Connect your SD card with computer and follow the next simple steps to fix SD card unallocated case now.

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#1. Restore SD Card Partition from Unallocated Space

Step 1. Connect the external storage device to your computer for lost partition recovery. To begin with, click "Partition Recovery" on the top menu. Then choose the target disk and click "Scan".

external partiton recovery step 1

Step 2. EaseUS Partition Master will scan and display all the partitions that are existing and lost under the selected disk. You can choose the partition that clearly shows as "Lost" in the "Status" tab and click "Proceed".

external partiton recovery step 2

Double-click on a partition will allow you to preview the content.

Step 3. Click "Recover Now" as along as all the lost data has been found. If not, go on with the "Continue Scanning" option.

external partiton recovery step 3

Step 4. Wait the software processing the final recovery. After that, click "Finish".

external partiton recovery step 4

Step 5. Your lost partition should reappear in the drive.

external partiton recovery step 5

#2. Create Partitions on Unallocated SD Card

If you want to create a partition on an empty USB, SD card or external hard drive, connect it to your PC in advance.

Step 1. Launch EaseUS Partition Master. On the main window, right-click on the unallocated space on your hard drive or external storage device and select "Create".

Step 2. Adjust the partition size, file system (Choose the file system based on your need), label, etc. for the new partition and click "OK" to continue. 

Step 3. Click on the "Execute Operation" button and create a new partition by clicking "Apply".

Watch the following video tutotial and learn how to create a partition in NTFS, FAT, or EXT file system.

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Solution 2. Free Partition Unallocated SD Card with Disk Management 

If you don't feel like using any software to fix SD card unallocated trouble, Windows Disk Management should help. But the precondition is that you should be familiar with Windows management jobs and be careful while partitioning unallocated SD card. 

Step 1. Connect SD card to PC, right-click "My Computer/This PC" and choose "Manage".

Step 2. Click "Disk Management", right-click SD card unallocated space and choose "New Simple Volume".

Step 3. Enter New Simple Volume and click "Next". Specify Volume Size and then click "Next".

Step 4. Assign drive letter or path, click "Next". Then Format Partition, choose "partition file system, size, label" and click "Next". 

Step 5. Click "Finish" to accomplish the whole process.

Do be careful while using Windows Disk Management to partition unallocated SD card.

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Updated by Cedric

Cedric Grantham is one of the senior editors of EaseUS who lives and works in Chengdu, China. He mainly writes articles about data recovery tutorials on PC and Mac and how-to tips for partition management. He always keeps an eye on new releases and likes various electronic products.

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Written by Brithny

Brithny is a technology enthusiast, aiming to make readers' tech life easy and enjoyable. She loves exploring new technologies and writing technical how-to tips. On her spare time, she loves sharing things about her favorite singer - Taylor Swift on her Facebook or Twitter.

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Product Reviews

TrustScore 4.7 | 49 reviews
  • 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. I also think the overall look and feel of EaseUS Partition Master Free makes whatever you're doing with your computer's partitions easy.

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  • Partition Master Free can Resize, Move, Merge, Migrate, and Copy disks or partitions; convert to local, change label, defragment, check and explore partition; and much more. A premium upgrade adds free tech support and the ability to resize dynamic volumes.

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  • It won't hot image your drives or align them, but since it's coupled with a partition manager, it allows you do perform many tasks at once, instead of just cloning drives. You can move partitions around, resize them, defragment, and more, along with the other tools you'd expect from a cloning tool.

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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.

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Video Tutorial

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How to Partititon a Hard Drive on Windows 10/8/7

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