Do you figure out the difference between the two items: unallocated space and free space in Windows 10 computer hard drive? Let's make it clear. Both of the space holds a portion of computer storage. However, the former suggests storage unusable with no file system to read and write data in it, and the latter is a ready-to-use storage that adding a drive letter to it can make it a regular drive.
So, to make full use of the hard drive storage, you have to convert unallocated space to free space before putting it to real use. In Windows 10 PC, right click "This PC" and go to Manage and then Disk Management under Storage, you can locate the unallocated space, right click it, and choose to create a new simple volume.
However, in this page, we don't recommend this way of converting this blank space. Regarding the cases that you might need recover data from the unallocated space before trying to create a new partition with free space on it.
EaseUS Partition Master, as the best Windows 10 Disk Management alternative, allows basic operations on a hard drive partition, such as resize/move partitions, format partition, create partition, convert unallocated space to free space or convert free space to unallocated space, convert FAT to NTFS without losing data, partition hard drive to many partitions and so on. Most of all, you can apply the free partition manager to recover data before starting to convert the missing or unallocated disk space to drives on Windows 10.
Download and install EaseUS Partition Master Free on your Windows 10 computer. Launch it, and learn the following video tutorial guide if you demand data recovery from unallocated disk space.
Next, to gain free space from the unallocated disk, two feasible solutions are provided. Choose either of the methods to make full use of the storage on your Windows 10 computer hard drive.
Step 1. Right-click the unallocated space, and choose "Create Partition".
Step 2. When the Create partition window pops out, you can enter a partition label, select a drive letter, cluster size, partition size, partition type (Primary/Logical) and file system from the pull-down menu. While creating partition, you also could resize the new partition to a certain size.
Step 3. Click "OK", a new partition will be created.
Step 1. Drag the unallocated space next to the partition you plan to extend (for example, c drive).
Step 2. Right-click c drive and select "Resize/Move partition".
Step 3. Position the mouse pointer on the right partition handle. Drag the handle to rightwards to extend C drive and click Ok.
Step 4. Click Apply. You've now successfully merged the unallocated space to system drive.
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